---
_id: '41971'
abstract:
- lang: ger
text: "Ultraschall-Drahtbonden ist eine Standardtechnologie im Bereich der Aufbau-
und Verbindungstechnik von Leistungshalbleitermodulen. Um Prozessschritte und
damit wertvolle Zeit zu sparen, sollen die Kupferdickdrähte für die Leistungshalbleiter
auch für die Kontaktierung von eingespritzten Anschlusssteckern im Modulrahmen
verwendet werden. Das Kontaktierungsverfahren mit diesen Drähten auf Steckern
in dünnwandigen Kunststoffrahmen führt häufig zu unzureichender Bondqualität.
In dieser Arbeit wird das Bonden von Anschlusssteckern experimentell und anhand
von Simulationen untersucht, um die Prozessstabilität zu steigern.\r\n\r\nZunächst
wurden Experimente auf Untergründen mit hoher Steifigkeit durchgeführt, um Störgrößen
von Untergrundeigenschaften zu verringern. Die gewonnenen Erkenntnisse erlaubten
die Entwicklung eines Simulationsmodells für die Vorhersage der Bondqualität.
Dieses basiert auf einer flächenaufgelösten Reibarbeitsbestimmung im Fügebereich
unter Berücksichtigung des Ultraschallerweichungseffektes und der hierdurch entstehenden
hohen Drahtverformung.\r\n\r\nExperimente an den Anschlusssteckern im Modulrahmen
zeigten eine verringerte Relativverschiebung zwischen Draht und Stecker, was zu
einer deutlichen Verringerung der Reibarbeit führt. Außerdem wurden verminderte
Schwingamplituden des Bondwerkzeugs nachgewiesen. Dies führt zu einer weiteren
Reduktion der Reibarbeit. Beide Effekte wurden mithilfe eines Mehrmassenschwingers
modelliert. Die gewonnenen Erkenntnisse und die erstellten Simulationsmodelle
ermöglichen die Entwicklung von Klemmvorrichtungen, welche die identifizierten
Störgrößen gezielt kompensieren und so ein verlässliches Bonden der Anschlussstecker
im gleichen Prozessschritt ermöglichen, in dem auch die Leistungshalbleiter kontaktiert
werden."
author:
- first_name: Simon
full_name: Althoff, Simon
last_name: Althoff
citation:
ama: Althoff S. Predicting the Bond Quality of Heavy Copper Wire Bonds Using
a Friction Model Approach. Vol 15. Shaker; 2023.
apa: Althoff, S. (2023). Predicting the Bond Quality of Heavy Copper Wire Bonds
using a Friction Model Approach (Vol. 15). Shaker.
bibtex: '@book{Althoff_2023, series={Schriften des Lehrstuhls für Dynamik und Mechatronik},
title={Predicting the Bond Quality of Heavy Copper Wire Bonds using a Friction
Model Approach}, volume={15}, publisher={Shaker}, author={Althoff, Simon}, year={2023},
collection={Schriften des Lehrstuhls für Dynamik und Mechatronik} }'
chicago: Althoff, Simon. Predicting the Bond Quality of Heavy Copper Wire Bonds
Using a Friction Model Approach. Vol. 15. Schriften Des Lehrstuhls Für Dynamik
Und Mechatronik. Shaker, 2023.
ieee: S. Althoff, Predicting the Bond Quality of Heavy Copper Wire Bonds using
a Friction Model Approach, vol. 15. Shaker, 2023.
mla: Althoff, Simon. Predicting the Bond Quality of Heavy Copper Wire Bonds Using
a Friction Model Approach. Shaker, 2023.
short: S. Althoff, Predicting the Bond Quality of Heavy Copper Wire Bonds Using
a Friction Model Approach, Shaker, 2023.
date_created: 2023-02-10T13:05:19Z
date_updated: 2023-02-10T13:05:42Z
department:
- _id: '151'
extern: '1'
intvolume: ' 15'
keyword:
- heavy copper bonding
- wire bonding
- quality prediction
- friction model
- point-contact-element
language:
- iso: eng
main_file_link:
- url: https://katalog.ub.uni-paderborn.de/local/r/9925085762506463?sr[q,any]=Simon%20Althoff
page: '192'
publication_identifier:
isbn:
- 978-3-8440-8903-5
publication_status: published
publisher: Shaker
related_material:
link:
- relation: confirmation
url: https://www.shaker.de/de/content/catalogue/index.asp?lang=de&ID=8&ISBN=978-3-8440-8903-5&search=yes
series_title: Schriften des Lehrstuhls für Dynamik und Mechatronik
status: public
supervisor:
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
title: Predicting the Bond Quality of Heavy Copper Wire Bonds using a Friction Model
Approach
type: dissertation
user_id: '55222'
volume: 15
year: '2023'
...
---
_id: '44036'
abstract:
- lang: eng
text: Abstract. In order to reduce global energy consumption in production
and industry along with the associated CO2 emissions, existing resources must
be used more efficiently. This includes the energy-efficient and comprehensive
recycling of a wide range of metals. Especially for the production of aluminium,
there is a large potential for saving energy using efficient recycling processes.
With regard to the recycling of aluminium studies have shown that solid-state
recycling processes are significantly more efficient considering the used energy
and resources compared to the conventional, smelting-metallurgical recycling process.
In this paper, the direct and energy-efficient friction-induced recycling process
(FIRP) based on the conform process is further described and analysed in terms
of the temperature-property relationships. For this purpose, the influence of
the processing temperature on the microstructure and properties of the recycled
semi-finished products is investigated using the toll system that enables an ECAP
forming. Specific sections of the (in theory) infinite, recycled semi-finished
product are taken and analysed at different process temperatures of the solid
state recycling process. Based on these sections, the properties in terms of mechanical
hardness, strength, ductility and grain size are analysed and a degressive relationship
between process temperature and mechanical hardness up to a temperature of 270
°C can be shown. Applying the Hall-Petch relationship, it is analysed whether
there is a correlation between the strength and the microstructure in the form
of the grain size.
author:
- first_name: Thomas
full_name: Borgert, Thomas
id: '83141'
last_name: Borgert
- first_name: Werner
full_name: Homberg, Werner
id: '233'
last_name: Homberg
citation:
ama: 'Borgert T, Homberg W. Analysis of temperature effect on strength and microstructure
in friction induced recycling process (FIRP). In: Materials Research Proceedings.
Materials Research Forum LLC; 2023. doi:10.21741/9781644902479-211'
apa: Borgert, T., & Homberg, W. (2023). Analysis of temperature effect on strength
and microstructure in friction induced recycling process (FIRP). Materials
Research Proceedings. ESAFORM 2023, Kraków. https://doi.org/10.21741/9781644902479-211
bibtex: '@inproceedings{Borgert_Homberg_2023, title={Analysis of temperature effect
on strength and microstructure in friction induced recycling process (FIRP)},
DOI={10.21741/9781644902479-211},
booktitle={Materials Research Proceedings}, publisher={Materials Research Forum
LLC}, author={Borgert, Thomas and Homberg, Werner}, year={2023} }'
chicago: Borgert, Thomas, and Werner Homberg. “Analysis of Temperature Effect on
Strength and Microstructure in Friction Induced Recycling Process (FIRP).” In
Materials Research Proceedings. Materials Research Forum LLC, 2023. https://doi.org/10.21741/9781644902479-211.
ieee: 'T. Borgert and W. Homberg, “Analysis of temperature effect on strength and
microstructure in friction induced recycling process (FIRP),” presented at the
ESAFORM 2023, Kraków, 2023, doi: 10.21741/9781644902479-211.'
mla: Borgert, Thomas, and Werner Homberg. “Analysis of Temperature Effect on Strength
and Microstructure in Friction Induced Recycling Process (FIRP).” Materials
Research Proceedings, Materials Research Forum LLC, 2023, doi:10.21741/9781644902479-211.
short: 'T. Borgert, W. Homberg, in: Materials Research Proceedings, Materials Research
Forum LLC, 2023.'
conference:
location: Kraków
name: ESAFORM 2023
date_created: 2023-04-17T08:00:28Z
date_updated: 2023-04-26T13:26:22Z
department:
- _id: '156'
doi: 10.21741/9781644902479-211
keyword:
- Recycling
- Aluminium
- Friction-Induced
- Energy Efficiency
language:
- iso: eng
publication: Materials Research Proceedings
publication_identifier:
issn:
- 2474-395X
publication_status: published
publisher: Materials Research Forum LLC
quality_controlled: '1'
status: public
title: Analysis of temperature effect on strength and microstructure in friction induced
recycling process (FIRP)
type: conference
user_id: '83141'
year: '2023'
...
---
_id: '21436'
abstract:
- lang: eng
text: Ultrasonic wire bonding is a solid-state joining process, used in the electronics
industry to form electrical connections, e.g. to connect electrical terminals
within semiconductor modules. Many process parameters affect the bond strength,
such like the bond normal force, ultrasonic power, wire material and bonding frequency.
Today, process design, development, and optimization is most likely based on the
knowledge of process engineers and is mainly performed by experimental testing.
In this contribution, a newly developed simulation tool is presented, to reduce
time and costs and efficiently determine optimized process parameter. Based on
a co-simulation of MATLAB and ANSYS, the different physical phenomena of the wire
bonding process are considered using finite element simulation for the complex
plastic deformation of the wire and reduced order models for the transient dynamics
of the transducer, wire, substrate and bond formation. The model parameters such
as the coefficients of friction between bond tool and wire and between wire and
substrate were determined for aluminium and copper wire in experiments with a
test rig specially developed for the requirements of heavy wire bonding. To reduce
simulation time, for the finite element simulation a restart analysis and high
performance computing is utilized. Detailed analysis of the bond formation showed,
that the normal pressure distribution in the contact between wire and substrate
has high impact on bond formation and distribution of welded areas in the contact
area.
author:
- first_name: Reinhard
full_name: Schemmel, Reinhard
id: '28647'
last_name: Schemmel
- first_name: Viktor
full_name: Krieger, Viktor
last_name: Krieger
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: Schemmel R, Krieger V, Hemsel T, Sextro W. Co-simulation of MATLAB and ANSYS
for ultrasonic wire bonding process optimization. Microelectronics Reliability.
2021;119:114077. doi:https://doi.org/10.1016/j.microrel.2021.114077
apa: Schemmel, R., Krieger, V., Hemsel, T., & Sextro, W. (2021). Co-simulation
of MATLAB and ANSYS for ultrasonic wire bonding process optimization. Microelectronics
Reliability, 119, 114077. https://doi.org/10.1016/j.microrel.2021.114077
bibtex: '@article{Schemmel_Krieger_Hemsel_Sextro_2021, title={Co-simulation of MATLAB
and ANSYS for ultrasonic wire bonding process optimization}, volume={119}, DOI={https://doi.org/10.1016/j.microrel.2021.114077},
journal={Microelectronics Reliability}, author={Schemmel, Reinhard and Krieger,
Viktor and Hemsel, Tobias and Sextro, Walter}, year={2021}, pages={114077} }'
chicago: 'Schemmel, Reinhard, Viktor Krieger, Tobias Hemsel, and Walter Sextro.
“Co-Simulation of MATLAB and ANSYS for Ultrasonic Wire Bonding Process Optimization.”
Microelectronics Reliability 119 (2021): 114077. https://doi.org/10.1016/j.microrel.2021.114077.'
ieee: 'R. Schemmel, V. Krieger, T. Hemsel, and W. Sextro, “Co-simulation of MATLAB
and ANSYS for ultrasonic wire bonding process optimization,” Microelectronics
Reliability, vol. 119, p. 114077, 2021, doi: https://doi.org/10.1016/j.microrel.2021.114077.'
mla: Schemmel, Reinhard, et al. “Co-Simulation of MATLAB and ANSYS for Ultrasonic
Wire Bonding Process Optimization.” Microelectronics Reliability, vol.
119, 2021, p. 114077, doi:https://doi.org/10.1016/j.microrel.2021.114077.
short: R. Schemmel, V. Krieger, T. Hemsel, W. Sextro, Microelectronics Reliability
119 (2021) 114077.
date_created: 2021-03-10T09:37:02Z
date_updated: 2023-09-21T14:15:33Z
department:
- _id: '151'
doi: https://doi.org/10.1016/j.microrel.2021.114077
intvolume: ' 119'
keyword:
- Ultrasonic heavy wire bonding
- Co-simulation
- ANSYS
- MATLAB
- Process optimization
- Friction coefficient
- Copper-copper
- Aluminium-copper
language:
- iso: eng
page: '114077'
publication: Microelectronics Reliability
publication_identifier:
issn:
- 0026-2714
publication_status: published
quality_controlled: '1'
status: public
title: Co-simulation of MATLAB and ANSYS for ultrasonic wire bonding process optimization
type: journal_article
user_id: '210'
volume: 119
year: '2021'
...
---
_id: '22272'
abstract:
- lang: eng
text: The number of multi-material joints is increasing as a result of lightweight
design. Self-piercing riveting (SPR) is an important mechanical joining technique
for multi-material structures. Rivets for SPR are coated to prevent corrosion,
but this coating also influences the friction that prevails during the joining
process. The aim of the present investigation is to evaluate this influence. The
investigation focuses on the common rivet coatings Almac® and zinc-nickel with
topcoat as well as on uncoated rivet surfaces. First of all, the coating thickness
and the uniformity of the coating distribution are analysed. Friction tests facilitate
the classification of the surface properties. The influence of the friction on
the characteristic joint parameters and the force-stroke curves is analysed by
means of experimental joining tests. More in-depth knowledge of the effects that
occur is achieved through the use of numerical simulation. Overall, it is shown
that the surface condition of the rivet has an impact on the friction during the
joining process and on the resulting joint. However, the detected deviations between
different surface conditions do not restrict the operational capability of SPR
and the properties of uncoated rivet surfaces, in particular, are similar to those
of Almac®-coated rivets. It can thus be assumed that SPR with respect to the joining
process is also possible without rivet coating in principle.
author:
- first_name: Benedikt
full_name: Uhe, Benedikt
id: '38131'
last_name: Uhe
- first_name: Clara-Maria
full_name: Kuball, Clara-Maria
last_name: Kuball
- first_name: Marion
full_name: Merklein, Marion
last_name: Merklein
- first_name: Gerson
full_name: Meschut, Gerson
id: '32056'
last_name: Meschut
orcid: 0000-0002-2763-1246
citation:
ama: Uhe B, Kuball C-M, Merklein M, Meschut G. Influence of the Rivet Coating on
the Friction during Self-Piercing Riveting. Key Engineering Materials.
2021;883:11-18. doi:10.4028/www.scientific.net/KEM.883.11
apa: Uhe, B., Kuball, C.-M., Merklein, M., & Meschut, G. (2021). Influence of
the Rivet Coating on the Friction during Self-Piercing Riveting. Key Engineering
Materials, 883, 11–18. https://doi.org/10.4028/www.scientific.net/KEM.883.11
bibtex: '@article{Uhe_Kuball_Merklein_Meschut_2021, title={Influence of the Rivet
Coating on the Friction during Self-Piercing Riveting}, volume={883}, DOI={10.4028/www.scientific.net/KEM.883.11},
journal={Key Engineering Materials}, author={Uhe, Benedikt and Kuball, Clara-Maria
and Merklein, Marion and Meschut, Gerson}, year={2021}, pages={11–18} }'
chicago: 'Uhe, Benedikt, Clara-Maria Kuball, Marion Merklein, and Gerson Meschut.
“Influence of the Rivet Coating on the Friction during Self-Piercing Riveting.”
Key Engineering Materials 883 (2021): 11–18. https://doi.org/10.4028/www.scientific.net/KEM.883.11.'
ieee: 'B. Uhe, C.-M. Kuball, M. Merklein, and G. Meschut, “Influence of the Rivet
Coating on the Friction during Self-Piercing Riveting,” Key Engineering Materials,
vol. 883, pp. 11–18, 2021, doi: 10.4028/www.scientific.net/KEM.883.11.'
mla: Uhe, Benedikt, et al. “Influence of the Rivet Coating on the Friction during
Self-Piercing Riveting.” Key Engineering Materials, vol. 883, 2021, pp.
11–18, doi:10.4028/www.scientific.net/KEM.883.11.
short: B. Uhe, C.-M. Kuball, M. Merklein, G. Meschut, Key Engineering Materials
883 (2021) 11–18.
date_created: 2021-05-31T10:06:11Z
date_updated: 2026-02-27T10:23:33Z
department:
- _id: '157'
doi: 10.4028/www.scientific.net/KEM.883.11
intvolume: ' 883'
keyword:
- Coating
- Friction
- Joining
language:
- iso: eng
page: 11-18
publication: Key Engineering Materials
quality_controlled: '1'
status: public
title: Influence of the Rivet Coating on the Friction during Self-Piercing Riveting
type: journal_article
user_id: '53912'
volume: 883
year: '2021'
...
---
_id: '10334'
abstract:
- lang: eng
text: Ultrasonic joining is a common industrial process. In the electronics industry
it is used to form electrical connections, including those of dissimilar materials.
Multiple influencing factors in ultrasonic joining are known and extensively investigated;
process parameters like ultrasonic power, bond force, and bonding frequency of
the ultrasonic vibration are known to have a high impact on a reliable joining
process and need to be adapted for each new application with different geometry
or materials. This contribution is focused on increasing ultrasonic power transmitted
to the interface and keeping mechanical stresses during ultrasonic bonding low
by using a multi-dimensional ultrasonic transducer concept. Bonding results for
a new designed connector pin in IGBT-modules achieved by multi- and one-dimensional
bonding are discussed.
author:
- first_name: Reinhard
full_name: Schemmel, Reinhard
id: '28647'
last_name: Schemmel
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Collin
full_name: Dymel, Collin
id: '66833'
last_name: Dymel
- first_name: Matthias
full_name: Hunstig, Matthias
last_name: Hunstig
- first_name: Michael
full_name: Brökelmann, Michael
last_name: Brökelmann
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Schemmel R, Hemsel T, Dymel C, Hunstig M, Brökelmann M, Sextro W. Using complex
multi-dimensional vibration trajectories in ultrasonic bonding and welding. Sensors
and Actuators A: Physical. 2019;295:653-662. doi:10.1016/j.sna.2019.04.025'
apa: 'Schemmel, R., Hemsel, T., Dymel, C., Hunstig, M., Brökelmann, M., & Sextro,
W. (2019). Using complex multi-dimensional vibration trajectories in ultrasonic
bonding and welding. Sensors and Actuators A: Physical, 295, 653–662.
https://doi.org/10.1016/j.sna.2019.04.025'
bibtex: '@article{Schemmel_Hemsel_Dymel_Hunstig_Brökelmann_Sextro_2019, title={Using
complex multi-dimensional vibration trajectories in ultrasonic bonding and welding},
volume={295}, DOI={10.1016/j.sna.2019.04.025},
journal={Sensors and Actuators A: Physical}, author={Schemmel, Reinhard and Hemsel,
Tobias and Dymel, Collin and Hunstig, Matthias and Brökelmann, Michael and Sextro,
Walter}, year={2019}, pages={653–662} }'
chicago: 'Schemmel, Reinhard, Tobias Hemsel, Collin Dymel, Matthias Hunstig, Michael
Brökelmann, and Walter Sextro. “Using Complex Multi-Dimensional Vibration Trajectories
in Ultrasonic Bonding and Welding.” Sensors and Actuators A: Physical 295
(2019): 653–62. https://doi.org/10.1016/j.sna.2019.04.025.'
ieee: 'R. Schemmel, T. Hemsel, C. Dymel, M. Hunstig, M. Brökelmann, and W. Sextro,
“Using complex multi-dimensional vibration trajectories in ultrasonic bonding
and welding,” Sensors and Actuators A: Physical, vol. 295, pp. 653–662,
2019, doi: 10.1016/j.sna.2019.04.025.'
mla: 'Schemmel, Reinhard, et al. “Using Complex Multi-Dimensional Vibration Trajectories
in Ultrasonic Bonding and Welding.” Sensors and Actuators A: Physical,
vol. 295, 2019, pp. 653–62, doi:10.1016/j.sna.2019.04.025.'
short: 'R. Schemmel, T. Hemsel, C. Dymel, M. Hunstig, M. Brökelmann, W. Sextro,
Sensors and Actuators A: Physical 295 (2019) 653–662.'
date_created: 2019-07-01T07:32:07Z
date_updated: 2023-09-21T14:12:15Z
department:
- _id: '151'
doi: 10.1016/j.sna.2019.04.025
intvolume: ' 295'
keyword:
- Ultrasonic bonding
- Ultrasonic welding
- Multi-dimensional bonding
- Complex vibration
- Multi-frequent
- Two-dimensional friction model
language:
- iso: eng
page: 653 - 662
project:
- _id: '93'
grant_number: MP-1-1-015
name: Hochleistungsbonden in energieeffizienten Leistungshalbleitermodulen
publication: 'Sensors and Actuators A: Physical'
publication_identifier:
issn:
- 0924-4247
quality_controlled: '1'
status: public
title: Using complex multi-dimensional vibration trajectories in ultrasonic bonding
and welding
type: journal_article
user_id: '210'
volume: 295
year: '2019'
...
---
_id: '63969'
abstract:
- lang: eng
text: A number of Ir-N-heterocyclic carbene (Ir-NHC) complexes with asymmetric N-heterocyclic
carbene (NHC) ligands have been prepared and examined for signal amplification
by reversible exchange (SABRE). Pyridine was chosen as model compound for hyperpolarization
experiments. This substrate was examined in a solvent mixture using several Ir-NHC
complexes, which differ in their NHC ligands. The SABRE polarization was created
at 6mT and the H-1 nuclear magnetic resonancesignals were detected at 7T. We show
that asymmetric NHC ligands, because of their favorable chemistry, can adapt the
SABREactive complexes to different chemical scenarios.
author:
- first_name: S.
full_name: Hadjiali, S.
last_name: Hadjiali
- first_name: R.
full_name: Savka, R.
last_name: Savka
- first_name: M.
full_name: Plaumann, M.
last_name: Plaumann
- first_name: U.
full_name: Bommerich, U.
last_name: Bommerich
- first_name: S.
full_name: Bothe, S.
last_name: Bothe
- first_name: Torsten
full_name: Gutmann, Torsten
id: '118165'
last_name: Gutmann
- first_name: T.
full_name: Ratajczyk, T.
last_name: Ratajczyk
- first_name: J.
full_name: Bernarding, J.
last_name: Bernarding
- first_name: H. H.
full_name: Limbach, H. H.
last_name: Limbach
- first_name: H.
full_name: Plenio, H.
last_name: Plenio
- first_name: G.
full_name: Buntkowsky, G.
last_name: Buntkowsky
citation:
ama: Hadjiali S, Savka R, Plaumann M, et al. Substituent Influences on the NMR Signal
Amplification of Ir Complexes with Heterocyclic Carbene Ligands. Applied Magnetic
Resonance. 2019;50(7):895–902. doi:10.1007/s00723-019-01115-x
apa: Hadjiali, S., Savka, R., Plaumann, M., Bommerich, U., Bothe, S., Gutmann, T.,
Ratajczyk, T., Bernarding, J., Limbach, H. H., Plenio, H., & Buntkowsky, G.
(2019). Substituent Influences on the NMR Signal Amplification of Ir Complexes
with Heterocyclic Carbene Ligands. Applied Magnetic Resonance, 50(7),
895–902. https://doi.org/10.1007/s00723-019-01115-x
bibtex: '@article{Hadjiali_Savka_Plaumann_Bommerich_Bothe_Gutmann_Ratajczyk_Bernarding_Limbach_Plenio_et
al._2019, title={Substituent Influences on the NMR Signal Amplification of Ir
Complexes with Heterocyclic Carbene Ligands}, volume={50}, DOI={10.1007/s00723-019-01115-x},
number={7}, journal={Applied Magnetic Resonance}, author={Hadjiali, S. and Savka,
R. and Plaumann, M. and Bommerich, U. and Bothe, S. and Gutmann, Torsten and Ratajczyk,
T. and Bernarding, J. and Limbach, H. H. and Plenio, H. and et al.}, year={2019},
pages={895–902} }'
chicago: 'Hadjiali, S., R. Savka, M. Plaumann, U. Bommerich, S. Bothe, Torsten Gutmann,
T. Ratajczyk, et al. “Substituent Influences on the NMR Signal Amplification of
Ir Complexes with Heterocyclic Carbene Ligands.” Applied Magnetic Resonance
50, no. 7 (2019): 895–902. https://doi.org/10.1007/s00723-019-01115-x.'
ieee: 'S. Hadjiali et al., “Substituent Influences on the NMR Signal Amplification
of Ir Complexes with Heterocyclic Carbene Ligands,” Applied Magnetic Resonance,
vol. 50, no. 7, pp. 895–902, 2019, doi: 10.1007/s00723-019-01115-x.'
mla: Hadjiali, S., et al. “Substituent Influences on the NMR Signal Amplification
of Ir Complexes with Heterocyclic Carbene Ligands.” Applied Magnetic Resonance,
vol. 50, no. 7, 2019, pp. 895–902, doi:10.1007/s00723-019-01115-x.
short: S. Hadjiali, R. Savka, M. Plaumann, U. Bommerich, S. Bothe, T. Gutmann, T.
Ratajczyk, J. Bernarding, H.H. Limbach, H. Plenio, G. Buntkowsky, Applied Magnetic
Resonance 50 (2019) 895–902.
date_created: 2026-02-07T15:40:18Z
date_updated: 2026-02-17T16:17:34Z
doi: 10.1007/s00723-019-01115-x
extern: '1'
intvolume: ' 50'
issue: '7'
keyword:
- dynamic nuclear-polarization
- hyperpolarization
- enhancement
- hydrogen induced polarization
- olefin-metathesis catalysts
- parahydrogen-induced polarization
- peptides
- Physics
- sabre
- spectroscopy
language:
- iso: eng
page: 895–902
publication: Applied Magnetic Resonance
publication_identifier:
issn:
- 1613-7507
status: public
title: Substituent Influences on the NMR Signal Amplification of Ir Complexes with
Heterocyclic Carbene Ligands
type: journal_article
user_id: '100715'
volume: 50
year: '2019'
...
---
_id: '9952'
abstract:
- lang: eng
text: The contact between viscoelastic materials e.g. elastomers and a rough surface
leads to a special friction characteristic, which differs greatly in its properties
comparing to other materials like metals. In practice, this friction combination
occurs for example in the tire-road contact, or in the use of rubber gaskets.
Due to the frictional forces a system is significantly influenced in its vibrational
properties. The friction force is composed of two main components adhesion and
hysteresis. The adhesion results from molecular bounds between the contact partners,
while the deformation of the viscoelastic material by the roughness of the counter
body leads to power loss. This internal friction results in an additional frictional
force, which is described by the hysteresis. To simulate the frictional behaviour
of elastomers on rough surfaces and thus to determine the energy dissipation in
contact, it is necessary to develop a mechanical model which considers the roughness
of the contact partners, as well as dynamic effects and the dependence on normal
pressure and sliding speed. The viscoelastic material behaviour must also be considered.
The contact between two rough surfaces is modelled as a rough rigid layer contacting
a rough elas- tic layer. The elastic layer is modelled by point masses connected
by Maxwell-elements. This allows the viscoelastic properties of the elastomer
to be considered. The behaviour of whole system can be described by equations
of motion with integrated constraints. The degrees of freedom of the model depends
on the varying contact conditions. A point mass not in contact has two degrees
of freedom. A point mass in contact moving along the roughness path can be described
by only one degree of freedom. For each Maxwell-Element also an inner coordinate
and thus a further degree of freedom is needed. Because of varying contact conditions
dur- ing the simulation, the simulation interrupts in case the contact conditions
change. Then the equations of motions are adapted with respect to the contact
constraints. As a result of the simulation one obtain the energy dissipation and
thus the friction char- acteristic during the friction process. It is possible
to use these results in three dimensional point-contact elements in order to model
contact surfaces on lager length scales.
author:
- first_name: Frank
full_name: Schulte, Frank
last_name: Schulte
- first_name: Jan
full_name: Neuhaus, Jan
last_name: Neuhaus
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Schulte F, Neuhaus J, Sextro W. A Mechanical Model for the Dynamical Contact
of Elastic Rough Bodies with Viscoelastic Properties. In: Proceedings of ICoEV
2015 International Conference on Engineering Vibration. ; 2015:1109-1117.'
apa: Schulte, F., Neuhaus, J., & Sextro, W. (2015). A Mechanical Model for the
Dynamical Contact of Elastic Rough Bodies with Viscoelastic Properties. In Proceedings
of ICoEV 2015 International Conference on Engineering Vibration (pp. 1109–1117).
bibtex: '@inproceedings{Schulte_Neuhaus_Sextro_2015, title={A Mechanical Model for
the Dynamical Contact of Elastic Rough Bodies with Viscoelastic Properties}, booktitle={Proceedings
of ICoEV 2015 International Conference on Engineering Vibration}, author={Schulte,
Frank and Neuhaus, Jan and Sextro, Walter}, year={2015}, pages={1109–1117} }'
chicago: Schulte, Frank, Jan Neuhaus, and Walter Sextro. “A Mechanical Model for
the Dynamical Contact of Elastic Rough Bodies with Viscoelastic Properties.” In
Proceedings of ICoEV 2015 International Conference on Engineering Vibration,
1109–17, 2015.
ieee: F. Schulte, J. Neuhaus, and W. Sextro, “A Mechanical Model for the Dynamical
Contact of Elastic Rough Bodies with Viscoelastic Properties,” in Proceedings
of ICoEV 2015 International Conference on Engineering Vibration, 2015, pp.
1109–1117.
mla: Schulte, Frank, et al. “A Mechanical Model for the Dynamical Contact of Elastic
Rough Bodies with Viscoelastic Properties.” Proceedings of ICoEV 2015 International
Conference on Engineering Vibration, 2015, pp. 1109–17.
short: 'F. Schulte, J. Neuhaus, W. Sextro, in: Proceedings of ICoEV 2015 International
Conference on Engineering Vibration, 2015, pp. 1109–1117.'
date_created: 2019-05-27T08:37:22Z
date_updated: 2019-09-16T10:47:53Z
department:
- _id: '151'
keyword:
- Contact Mechanics
- Viscoelastic Material
- Adhesive Friction
- Hysteresis Friction
- Energy Dissipation
- Vibration
language:
- iso: eng
page: 1109-1117
publication: Proceedings of ICoEV 2015 International Conference on Engineering Vibration
quality_controlled: '1'
status: public
title: A Mechanical Model for the Dynamical Contact of Elastic Rough Bodies with Viscoelastic
Properties
type: conference
user_id: '55222'
year: '2015'
...
---
_id: '34441'
abstract:
- lang: eng
text: The state of the art industrial manufacturing process to produce shafts as
counter surfaces for radial shaft seal rings is plunge grinding. This process
consists of three major steps. The blank is turned to a slight diameter-oversize
followed by the heat treatment and the hard-finishing by plunge grinding. The
geometric surface structures of the resulting shafts in general exhibit a stochastic
distribution. These surface characteristics contribute to a reliable and stable
sealing functionality. And the surface and subsurface hardness generally leads
to a higher wear resistance of the shaft. Motivated by economic benefits and in
order to achieve a compact production process for at least ten years, turning
is investigated as an alternative manufacturing process. However due to the resulting
lead structure on the shaft surface and the associated risk of leakage it has
not become prevalent yet. In this paper turned shafts of the metastable austenitic
steel AISI 347 (1.4550, X6CrNiNb1810) are investigated as alternative material
for counter surfaces of radial shaft seal rings and compared to turned shafts
of carburized AISI 5115 (1.7131, 16MnCr5). In addition to surfaces dry turned
at room-temperature, cryogenic turned AISI 347 counter surfaces are analyzed.
By applying cryogenic cooling, the formation of deformation-induced α′-martensite
in the surface layer is possible during the turning process. Endurance tests in
radial shaft seal ring test rigs are performed and complemented with detailed
investigations of microstructure, micro-hardness and surface topography. The results
are compared to results of state of the art ground AISI 5115 shafts.
author:
- first_name: D.
full_name: Frölich, D.
last_name: Frölich
- first_name: Balázs
full_name: Magyar, Balázs
id: '97759'
last_name: Magyar
- first_name: B.
full_name: Sauer, B.
last_name: Sauer
- first_name: P.
full_name: Mayer, P.
last_name: Mayer
- first_name: B.
full_name: Kirsch, B.
last_name: Kirsch
- first_name: J.C.
full_name: Aurich, J.C.
last_name: Aurich
- first_name: R.
full_name: Skorupski, R.
last_name: Skorupski
- first_name: M.
full_name: Smaga, M.
last_name: Smaga
- first_name: T.
full_name: Beck, T.
last_name: Beck
- first_name: D.
full_name: Eifler, D.
last_name: Eifler
citation:
ama: Frölich D, Magyar B, Sauer B, et al. Investigation of wear resistance of dry
and cryogenic turned metastable austenitic steel shafts and dry turned and ground
carburized steel shafts in the radial shaft seal ring system. Wear. 2015;328-329:123-131.
doi:https://doi.org/10.1016/j.wear.2015.02.004
apa: Frölich, D., Magyar, B., Sauer, B., Mayer, P., Kirsch, B., Aurich, J. C., Skorupski,
R., Smaga, M., Beck, T., & Eifler, D. (2015). Investigation of wear resistance
of dry and cryogenic turned metastable austenitic steel shafts and dry turned
and ground carburized steel shafts in the radial shaft seal ring system. Wear,
328–329, 123–131. https://doi.org/10.1016/j.wear.2015.02.004
bibtex: '@article{Frölich_Magyar_Sauer_Mayer_Kirsch_Aurich_Skorupski_Smaga_Beck_Eifler_2015,
title={Investigation of wear resistance of dry and cryogenic turned metastable
austenitic steel shafts and dry turned and ground carburized steel shafts in the
radial shaft seal ring system}, volume={328–329}, DOI={https://doi.org/10.1016/j.wear.2015.02.004},
journal={Wear}, author={Frölich, D. and Magyar, Balázs and Sauer, B. and Mayer,
P. and Kirsch, B. and Aurich, J.C. and Skorupski, R. and Smaga, M. and Beck, T.
and Eifler, D.}, year={2015}, pages={123–131} }'
chicago: 'Frölich, D., Balázs Magyar, B. Sauer, P. Mayer, B. Kirsch, J.C. Aurich,
R. Skorupski, M. Smaga, T. Beck, and D. Eifler. “Investigation of Wear Resistance
of Dry and Cryogenic Turned Metastable Austenitic Steel Shafts and Dry Turned
and Ground Carburized Steel Shafts in the Radial Shaft Seal Ring System.” Wear
328–329 (2015): 123–31. https://doi.org/10.1016/j.wear.2015.02.004.'
ieee: 'D. Frölich et al., “Investigation of wear resistance of dry and cryogenic
turned metastable austenitic steel shafts and dry turned and ground carburized
steel shafts in the radial shaft seal ring system,” Wear, vol. 328–329,
pp. 123–131, 2015, doi: https://doi.org/10.1016/j.wear.2015.02.004.'
mla: Frölich, D., et al. “Investigation of Wear Resistance of Dry and Cryogenic
Turned Metastable Austenitic Steel Shafts and Dry Turned and Ground Carburized
Steel Shafts in the Radial Shaft Seal Ring System.” Wear, vol. 328–329,
2015, pp. 123–31, doi:https://doi.org/10.1016/j.wear.2015.02.004.
short: D. Frölich, B. Magyar, B. Sauer, P. Mayer, B. Kirsch, J.C. Aurich, R. Skorupski,
M. Smaga, T. Beck, D. Eifler, Wear 328–329 (2015) 123–131.
date_created: 2022-12-15T10:17:23Z
date_updated: 2022-12-15T10:18:54Z
department:
- _id: '146'
doi: https://doi.org/10.1016/j.wear.2015.02.004
extern: '1'
keyword:
- Radial shaft seal ring
- Shaft surface
- Cryogenic turning
- Metastable austenitic steel
- Deformation-induced martensite formation
language:
- iso: eng
page: 123-131
publication: Wear
publication_identifier:
issn:
- 0043-1648
status: public
title: Investigation of wear resistance of dry and cryogenic turned metastable austenitic
steel shafts and dry turned and ground carburized steel shafts in the radial shaft
seal ring system
type: journal_article
user_id: '38077'
volume: 328-329
year: '2015'
...
---
_id: '9868'
abstract:
- lang: eng
text: In order to increase mechanical strength, heat dissipation and ampacity and
to decrease failure through fatigue fracture, wedge copper wire bonding is being
introduced as a standard interconnection method for mass production. To achieve
the same process stability when using copper wire instead of aluminum wire a profound
understanding of the bonding process is needed. Due to the higher hardness of
copper compared to aluminum wire it is more difficult to approach the surfaces
of wire and substrate to a level where van der Waals forces are able to arise
between atoms. Also, enough friction energy referred to the total contact area
has to be generated to activate the surfaces. Therefore, a friction model is used
to simulate the joining process. This model calculates the resulting energy of
partial areas in the contact surface and provides information about the adhesion
process of each area. The focus here is on the arising of micro joints in the
contact area depending on the location in the contact and time. To validate the
model, different touchdown forces are used to vary the initial contact areas of
wire and substrate. Additionally, a piezoelectric tri-axial force sensor is built
up to identify the known phases of pre-deforming, cleaning, adhering and diffusing
for the real bonding process to map with the model. Test substrates as DBC and
copper plate are used to show the different formations of a wedge bond connection
due to hardness and reaction propensity. The experiments were done by using 500
$\mu$m copper wire and a standard V-groove tool.
author:
- first_name: Simon
full_name: Althoff, Simon
last_name: Althoff
- first_name: Jan
full_name: Neuhaus, Jan
last_name: Neuhaus
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Althoff S, Neuhaus J, Hemsel T, Sextro W. Improving the bond quality of copper
wire bonds using a friction model approach. In: Electronic Components and Technology
Conference (ECTC), 2014 IEEE 64th. ; 2014:1549-1555. doi:10.1109/ECTC.2014.6897500'
apa: Althoff, S., Neuhaus, J., Hemsel, T., & Sextro, W. (2014). Improving the
bond quality of copper wire bonds using a friction model approach. In Electronic
Components and Technology Conference (ECTC), 2014 IEEE 64th (pp. 1549–1555).
https://doi.org/10.1109/ECTC.2014.6897500
bibtex: '@inproceedings{Althoff_Neuhaus_Hemsel_Sextro_2014, title={Improving the
bond quality of copper wire bonds using a friction model approach}, DOI={10.1109/ECTC.2014.6897500},
booktitle={Electronic Components and Technology Conference (ECTC), 2014 IEEE 64th},
author={Althoff, Simon and Neuhaus, Jan and Hemsel, Tobias and Sextro, Walter},
year={2014}, pages={1549–1555} }'
chicago: Althoff, Simon, Jan Neuhaus, Tobias Hemsel, and Walter Sextro. “Improving
the Bond Quality of Copper Wire Bonds Using a Friction Model Approach.” In Electronic
Components and Technology Conference (ECTC), 2014 IEEE 64th, 1549–55, 2014.
https://doi.org/10.1109/ECTC.2014.6897500.
ieee: S. Althoff, J. Neuhaus, T. Hemsel, and W. Sextro, “Improving the bond quality
of copper wire bonds using a friction model approach,” in Electronic Components
and Technology Conference (ECTC), 2014 IEEE 64th, 2014, pp. 1549–1555.
mla: Althoff, Simon, et al. “Improving the Bond Quality of Copper Wire Bonds Using
a Friction Model Approach.” Electronic Components and Technology Conference
(ECTC), 2014 IEEE 64th, 2014, pp. 1549–55, doi:10.1109/ECTC.2014.6897500.
short: 'S. Althoff, J. Neuhaus, T. Hemsel, W. Sextro, in: Electronic Components
and Technology Conference (ECTC), 2014 IEEE 64th, 2014, pp. 1549–1555.'
date_created: 2019-05-20T12:11:44Z
date_updated: 2019-09-16T10:57:58Z
department:
- _id: '151'
doi: 10.1109/ECTC.2014.6897500
keyword:
- adhesion
- circuit reliability
- deformation
- diffusion
- fatigue cracks
- friction
- interconnections
- lead bonding
- van der Waals forces
- Cu
- adhering process
- adhesion process
- ampacity improvement
- bond quality improvement
- cleaning process
- diffusing process
- fatigue fracture failure
- friction energy
- friction model
- heat dissipation
- mechanical strength
- piezoelectric triaxial force sensor
- predeforming process
- size 500 mum
- total contact area
- van der Waals forces
- wedge copper wire bonding
- Bonding
- Copper
- Finite element analysis
- Force
- Friction
- Substrates
- Wires
language:
- iso: eng
page: 1549-1555
publication: Electronic Components and Technology Conference (ECTC), 2014 IEEE 64th
quality_controlled: '1'
status: public
title: Improving the bond quality of copper wire bonds using a friction model approach
type: conference
user_id: '55222'
year: '2014'
...
---
_id: '9876'
abstract:
- lang: eng
text: Piezoelectric inertia motors use the inertia of a body to drive it by means
of a friction contact in a series of small steps. It has been shown previously
in theoretical investigations that higher velocities and smoother movements can
be obtained if these steps do not contain phases of stiction (''stick-slip`` operation),
but use sliding friction only (''slip-slip`` operation). One very promising driving
option for such motors is the superposition of multiple sinusoidal signals or
harmonics. In this contribution, the theoretical results are validated experimentally.
In this context, a quick and reliable identification process for parameters describing
the friction contact is proposed. Additionally, the force generation potential
of inertia motors is investigated theoretically and experimentally. The experimental
results confirm the theoretical result that for a given maximum frequency, a signal
with a high fundamental frequency and consisting of two superposed sine waves
leads to the highest velocity and the smoothest motion, while the maximum motor
force is obtained with signals containing more harmonics. These results are of
fundamental importance for the further development of high-velocity piezoelectric
inertia motors.
author:
- first_name: Matthias
full_name: Hunstig, Matthias
last_name: Hunstig
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Hunstig M, Hemsel T, Sextro W. High-velocity operation of piezoelectric inertia
motors: experimental validation. Archive of Applied Mechanics. 2014:1-9.
doi:10.1007/s00419-014-0940-0'
apa: 'Hunstig, M., Hemsel, T., & Sextro, W. (2014). High-velocity operation
of piezoelectric inertia motors: experimental validation. Archive of Applied
Mechanics, 1–9. https://doi.org/10.1007/s00419-014-0940-0'
bibtex: '@article{Hunstig_Hemsel_Sextro_2014, title={High-velocity operation of
piezoelectric inertia motors: experimental validation}, DOI={10.1007/s00419-014-0940-0},
journal={Archive of Applied Mechanics}, publisher={Springer Berlin Heidelberg},
author={Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}, year={2014},
pages={1–9} }'
chicago: 'Hunstig, Matthias, Tobias Hemsel, and Walter Sextro. “High-Velocity Operation
of Piezoelectric Inertia Motors: Experimental Validation.” Archive of Applied
Mechanics, 2014, 1–9. https://doi.org/10.1007/s00419-014-0940-0.'
ieee: 'M. Hunstig, T. Hemsel, and W. Sextro, “High-velocity operation of piezoelectric
inertia motors: experimental validation,” Archive of Applied Mechanics,
pp. 1–9, 2014.'
mla: 'Hunstig, Matthias, et al. “High-Velocity Operation of Piezoelectric Inertia
Motors: Experimental Validation.” Archive of Applied Mechanics, Springer
Berlin Heidelberg, 2014, pp. 1–9, doi:10.1007/s00419-014-0940-0.'
short: M. Hunstig, T. Hemsel, W. Sextro, Archive of Applied Mechanics (2014) 1–9.
date_created: 2019-05-20T13:08:08Z
date_updated: 2019-05-20T13:08:43Z
department:
- _id: '151'
doi: 10.1007/s00419-014-0940-0
keyword:
- Inertia motor
- High velocity
- Stick-slip motor
- Slip-slip operation
- Friction parameter identification
language:
- iso: eng
page: 1-9
publication: Archive of Applied Mechanics
publication_identifier:
issn:
- 0939-1533
publisher: Springer Berlin Heidelberg
status: public
title: 'High-velocity operation of piezoelectric inertia motors: experimental validation'
type: journal_article
user_id: '55222'
year: '2014'
...
---
_id: '34442'
abstract:
- lang: eng
text: Radial shaft seals are used in a variety of applications, where rotating shafts
in steady housings have to be sealed. Typical examples are crankshafts, camshafts,
differential gear or hydraulic pumps. In the operating state the elastomeric seal
ring and the shaft are separated by a lubrication film of just a few micrometers.
Due to shear strain and fluid friction the contact area is subject to a higher
temperature than the rest of the seal ring. The stiffness of the elastomeric material
is intensely influenced by this temperature and thus contact pressure, friction
and wear also strongly depend on the contact temperature. In order to simulate
the contact behavior of elastomer seal rings it is essential to use a comprehensive
approach which takes into consideration the interaction of temperature, friction
and wear. Based on this idea a macroscopic simulation model has been developed
at the MEGT. It combines a finite element approach for the simulation of contact
pressure at different wear states, a semi-analytical approach for the calculation
of contact temperature and an empirical approach for the calculation of friction.
In this paper the model setup is presented, as well as simulation and experimental
results.
author:
- first_name: D.
full_name: Frölich, D.
last_name: Frölich
- first_name: Balázs
full_name: Magyar, Balázs
id: '97759'
last_name: Magyar
- first_name: B.
full_name: Sauer, B.
last_name: Sauer
citation:
ama: Frölich D, Magyar B, Sauer B. A comprehensive model of wear, friction and contact
temperature in radial shaft seals. Wear. 2014;311(1):71-80. doi:https://doi.org/10.1016/j.wear.2013.12.030
apa: Frölich, D., Magyar, B., & Sauer, B. (2014). A comprehensive model of wear,
friction and contact temperature in radial shaft seals. Wear, 311(1),
71–80. https://doi.org/10.1016/j.wear.2013.12.030
bibtex: '@article{Frölich_Magyar_Sauer_2014, title={A comprehensive model of wear,
friction and contact temperature in radial shaft seals}, volume={311}, DOI={https://doi.org/10.1016/j.wear.2013.12.030},
number={1}, journal={Wear}, author={Frölich, D. and Magyar, Balázs and Sauer,
B.}, year={2014}, pages={71–80} }'
chicago: 'Frölich, D., Balázs Magyar, and B. Sauer. “A Comprehensive Model of Wear,
Friction and Contact Temperature in Radial Shaft Seals.” Wear 311, no.
1 (2014): 71–80. https://doi.org/10.1016/j.wear.2013.12.030.'
ieee: 'D. Frölich, B. Magyar, and B. Sauer, “A comprehensive model of wear, friction
and contact temperature in radial shaft seals,” Wear, vol. 311, no. 1,
pp. 71–80, 2014, doi: https://doi.org/10.1016/j.wear.2013.12.030.'
mla: Frölich, D., et al. “A Comprehensive Model of Wear, Friction and Contact Temperature
in Radial Shaft Seals.” Wear, vol. 311, no. 1, 2014, pp. 71–80, doi:https://doi.org/10.1016/j.wear.2013.12.030.
short: D. Frölich, B. Magyar, B. Sauer, Wear 311 (2014) 71–80.
date_created: 2022-12-15T10:19:37Z
date_updated: 2022-12-15T10:20:39Z
department:
- _id: '146'
doi: https://doi.org/10.1016/j.wear.2013.12.030
extern: '1'
intvolume: ' 311'
issue: '1'
keyword:
- Radial shaft seal ring
- Contact temperature
- Wear
- Friction torque
- Finite element simulation
language:
- iso: eng
page: 71-80
publication: Wear
publication_identifier:
issn:
- 0043-1648
status: public
title: A comprehensive model of wear, friction and contact temperature in radial shaft
seals
type: journal_article
user_id: '38077'
volume: 311
year: '2014'
...
---
_id: '9797'
abstract:
- lang: eng
text: A model approach for wedge/wedge bonding copper wire is presented. The connection
between wire and substrate is based on a variety of physical effects, but the
dominant one is the friction based welding while applying ultrasound. Consequently,
a friction model was used to investigate the welding process. This model is built
up universal and can be used to describe the formation of micro welds in the time
variant contact area between wire and substrate. Aim of the model is to identify
the interactions between touchdown, bond normal force, ultrasonic power and bonding
time. To do so, the contact area is discretized into partial areas where a Point
Contact Model is applied. Based on this approach it is possible to simulate micro
and macro slip inside the contact area between wire and substrate. The work done
by friction force is a main criterion to define occurring micro joints which influence
the subsequent welding.
author:
- first_name: Simon
full_name: Althoff, Simon
last_name: Althoff
- first_name: Jan
full_name: Neuhaus, Jan
last_name: Neuhaus
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: 'Althoff S, Neuhaus J, Hemsel T, Sextro W. A friction based approach for modeling
wire bonding. In: IMAPS 2013, 46th International Symposium on Microelectronics.
Orlando (Florida), USA; 2013. doi:10.4071/isom-2013-TA67'
apa: Althoff, S., Neuhaus, J., Hemsel, T., & Sextro, W. (2013). A friction based
approach for modeling wire bonding. In IMAPS 2013, 46th International Symposium
on Microelectronics. Orlando (Florida), USA. https://doi.org/10.4071/isom-2013-TA67
bibtex: '@inproceedings{Althoff_Neuhaus_Hemsel_Sextro_2013, place={Orlando (Florida),
USA}, title={A friction based approach for modeling wire bonding}, DOI={10.4071/isom-2013-TA67},
booktitle={IMAPS 2013, 46th International Symposium on Microelectronics}, author={Althoff,
Simon and Neuhaus, Jan and Hemsel, Tobias and Sextro, Walter}, year={2013} }'
chicago: Althoff, Simon, Jan Neuhaus, Tobias Hemsel, and Walter Sextro. “A Friction
Based Approach for Modeling Wire Bonding.” In IMAPS 2013, 46th International
Symposium on Microelectronics. Orlando (Florida), USA, 2013. https://doi.org/10.4071/isom-2013-TA67.
ieee: S. Althoff, J. Neuhaus, T. Hemsel, and W. Sextro, “A friction based approach
for modeling wire bonding,” in IMAPS 2013, 46th International Symposium on
Microelectronics, 2013.
mla: Althoff, Simon, et al. “A Friction Based Approach for Modeling Wire Bonding.”
IMAPS 2013, 46th International Symposium on Microelectronics, 2013, doi:10.4071/isom-2013-TA67.
short: 'S. Althoff, J. Neuhaus, T. Hemsel, W. Sextro, in: IMAPS 2013, 46th International
Symposium on Microelectronics, Orlando (Florida), USA, 2013.'
date_created: 2019-05-13T13:55:36Z
date_updated: 2022-01-06T07:04:20Z
department:
- _id: '151'
doi: 10.4071/isom-2013-TA67
keyword:
- Wire bonding
- friction modeling
- wire bond quality
- contact element modeling
language:
- iso: eng
place: Orlando (Florida), USA
publication: IMAPS 2013, 46th International Symposium on Microelectronics
status: public
title: A friction based approach for modeling wire bonding
type: conference
user_id: '55222'
year: '2013'
...
---
_id: '9803'
abstract:
- lang: eng
text: Piezoelectric inertia motors, also known as stickslip drives or (smooth) impact
drives, use the inertia of a body to drive it by a friction contact in small steps,
in the majority of motors composed of a stick phase and a slip phase between the
friction partners. For optimizing inertia motors, it is important to understand
the friction contact correctly and to measure its properties appropriately. This
contribution presents experimental set-ups for measuring the contact force, friction
force and relative displacement in an actual inertia motor with a dry friction
contact and numerical simulations of the motor operation. The motor uses a pre-stressed
multilayer actuator with a displacement in the range of 20 $\mu$ m. It is shown
that a previously postulated condition for the applicability of simple kinetic
friction models is well fulfilled for the investigated motor. The friction contact
in the motor is simulated using different kinetic friction models. The input for
the friction models is the measured motion of the rod. The models qualitatively
reproduce the measured motion but show quantitative deviations varying with frequency.
These can be explained by vibrations of the driving rod that are experimentally
investigated.
author:
- first_name: Matthias
full_name: Hunstig, Matthias
last_name: Hunstig
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
citation:
ama: Hunstig M, Hemsel T, Sextro W. Modelling the friction contact in an inertia
motor. Journal of Intelligent Material Systems and Structures. 2013;24(11):1380-1391.
doi:10.1177/1045389X12474354
apa: Hunstig, M., Hemsel, T., & Sextro, W. (2013). Modelling the friction contact
in an inertia motor. Journal of Intelligent Material Systems and Structures,
24(11), 1380–1391. https://doi.org/10.1177/1045389X12474354
bibtex: '@article{Hunstig_Hemsel_Sextro_2013, title={Modelling the friction contact
in an inertia motor}, volume={24}, DOI={10.1177/1045389X12474354},
number={11}, journal={Journal of Intelligent Material Systems and Structures},
author={Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}, year={2013},
pages={1380–1391} }'
chicago: 'Hunstig, Matthias, Tobias Hemsel, and Walter Sextro. “Modelling the Friction
Contact in an Inertia Motor.” Journal of Intelligent Material Systems and Structures
24, no. 11 (2013): 1380–91. https://doi.org/10.1177/1045389X12474354.'
ieee: M. Hunstig, T. Hemsel, and W. Sextro, “Modelling the friction contact in an
inertia motor,” Journal of Intelligent Material Systems and Structures,
vol. 24, no. 11, pp. 1380–1391, 2013.
mla: Hunstig, Matthias, et al. “Modelling the Friction Contact in an Inertia Motor.”
Journal of Intelligent Material Systems and Structures, vol. 24, no. 11,
2013, pp. 1380–91, doi:10.1177/1045389X12474354.
short: M. Hunstig, T. Hemsel, W. Sextro, Journal of Intelligent Material Systems
and Structures 24 (2013) 1380–1391.
date_created: 2019-05-13T14:08:01Z
date_updated: 2022-01-06T07:04:21Z
department:
- _id: '151'
doi: 10.1177/1045389X12474354
intvolume: ' 24'
issue: '11'
keyword:
- Actuator
- friction
- motor
- piezoelectric
language:
- iso: eng
page: 1380-1391
publication: Journal of Intelligent Material Systems and Structures
status: public
title: Modelling the friction contact in an inertia motor
type: journal_article
user_id: '55222'
volume: 24
year: '2013'
...
---
_id: '9784'
abstract:
- lang: eng
text: Piezoelectric inertia motors use the inertia of a body to drive it by means
of a friction contact in a series of small steps. These motors can operate in
``stick-slip'' or ``slip-slip'' mode, with the fundamental frequency of the driving
signal ranging from several Hertz to more than 100 kHz. To predict the motor characteristics,
a Coulomb friction model is sufficient in many cases, but numerical simulation
requires microscopic time steps. This contribution proposes a much faster simulation
technique using one evaluation per period of the excitation signal. The proposed
technique produces results very close to those of timestep simulation for ultrasonics
inertia motors and allows direct determination of the steady-state velocity of
an inertia motor from the motion profile of the driving part. Thus it is a useful
simulation technique which can be applied in both analysis and design of inertia
motors, especially for parameter studies and optimisation.
author:
- first_name: Matthias
full_name: Hunstig, Matthias
last_name: Hunstig
- first_name: Tobias
full_name: Hemsel, Tobias
last_name: Hemsel
- first_name: Walter
full_name: Sextro, Walter
last_name: Sextro
citation:
ama: 'Hunstig M, Hemsel T, Sextro W. An efficient simulation technique for high-frequency
piezoelectric inertia motors. In: Ultrasonics Symposium (IUS), 2012 IEEE International.
; 2012:277-280. doi:10.1109/ULTSYM.2012.0068'
apa: Hunstig, M., Hemsel, T., & Sextro, W. (2012). An efficient simulation technique
for high-frequency piezoelectric inertia motors. In Ultrasonics Symposium (IUS),
2012 IEEE International (pp. 277–280). https://doi.org/10.1109/ULTSYM.2012.0068
bibtex: '@inproceedings{Hunstig_Hemsel_Sextro_2012, title={An efficient simulation
technique for high-frequency piezoelectric inertia motors}, DOI={10.1109/ULTSYM.2012.0068},
booktitle={Ultrasonics Symposium (IUS), 2012 IEEE International}, author={Hunstig,
Matthias and Hemsel, Tobias and Sextro, Walter}, year={2012}, pages={277–280}
}'
chicago: Hunstig, Matthias, Tobias Hemsel, and Walter Sextro. “An Efficient Simulation
Technique for High-Frequency Piezoelectric Inertia Motors.” In Ultrasonics
Symposium (IUS), 2012 IEEE International, 277–80, 2012. https://doi.org/10.1109/ULTSYM.2012.0068.
ieee: M. Hunstig, T. Hemsel, and W. Sextro, “An efficient simulation technique for
high-frequency piezoelectric inertia motors,” in Ultrasonics Symposium (IUS),
2012 IEEE International, 2012, pp. 277–280.
mla: Hunstig, Matthias, et al. “An Efficient Simulation Technique for High-Frequency
Piezoelectric Inertia Motors.” Ultrasonics Symposium (IUS), 2012 IEEE International,
2012, pp. 277–80, doi:10.1109/ULTSYM.2012.0068.
short: 'M. Hunstig, T. Hemsel, W. Sextro, in: Ultrasonics Symposium (IUS), 2012
IEEE International, 2012, pp. 277–280.'
date_created: 2019-05-13T13:20:17Z
date_updated: 2022-01-06T07:04:20Z
department:
- _id: '151'
doi: 10.1109/ULTSYM.2012.0068
keyword:
- friction
- ultrasonic motors
- Coulomb friction model
- efficient simulation technique
- friction contact
- high-frequency piezoelectric inertia motor
- motor characteristics prediction
- numerical simulation
- slip-slip mode
- stick-slip mode
- time-step simulation
- ultrasonic inertia motor
- Acceleration
- Acoustics
- Actuators
- Computational modeling
- Friction
- Numerical models
- Steady-state
language:
- iso: eng
page: 277-280
publication: Ultrasonics Symposium (IUS), 2012 IEEE International
publication_identifier:
issn:
- 1948-5719
quality_controlled: '1'
status: public
title: An efficient simulation technique for high-frequency piezoelectric inertia
motors
type: conference
user_id: '55222'
year: '2012'
...
---
_id: '9772'
abstract:
- lang: eng
text: 'A profound description of friction in wheel--rail contact plays an essential
role for optimization of traction control strategies, as input quantity for railway
simulations in general and for the estimation of wear and rolling contact fatigue.
A multitude of wheel--rail contact models exists, however, traction--creepage
curves obtained from measurements show quantitative and qualitative deviations.
There are several phenomena which influence the traction--creepage characteristics:
Mechanisms resulting from surface roughness, frictional heating or the presence
of interfacial fluids can have a dominating influence on friction. In this paper,
a new wheel--rail contact model, accounting for these influential parameters,
will be presented. The presented model accounts for the interaction of an interfacial
fluid model for combined boundary and mixed lubrication of rough surfaces with
a wheel--rail contact model that additionally accounts for frictional heating.
A quantitative comparison with measurements found in the literature is not conducted,
since the exact conditions of the measurements are mostly unknown and parameters
can easily be adjusted to fit the measurements. Emphasis is placed on the qualitative
behavior of the model with respect to the measurements and good agreement is found.
The dependence of the maximum traction coefficient on rolling velocity, surface
roughness and normal load is studied under dry and water lubricated conditions.'
author:
- first_name: Christoph
full_name: Tomberger, Christoph
last_name: Tomberger
- first_name: Peter
full_name: Dietmaier, Peter
last_name: Dietmaier
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
- first_name: Klaus
full_name: Six, Klaus
last_name: Six
citation:
ama: 'Tomberger C, Dietmaier P, Sextro W, Six K. Friction in wheel--rail contact:
A model comprising interfacial fluids, surface roughness and temperature. Wear.
2011;271:2-12. doi:10.1016/j.wear.2010.10.025'
apa: 'Tomberger, C., Dietmaier, P., Sextro, W., & Six, K. (2011). Friction in
wheel--rail contact: A model comprising interfacial fluids, surface roughness
and temperature. Wear, 271, 2–12. https://doi.org/10.1016/j.wear.2010.10.025'
bibtex: '@article{Tomberger_Dietmaier_Sextro_Six_2011, title={Friction in wheel--rail
contact: A model comprising interfacial fluids, surface roughness and temperature},
volume={271}, DOI={10.1016/j.wear.2010.10.025},
journal={Wear}, author={Tomberger, Christoph and Dietmaier, Peter and Sextro,
Walter and Six, Klaus}, year={2011}, pages={2–12} }'
chicago: 'Tomberger, Christoph, Peter Dietmaier, Walter Sextro, and Klaus Six. “Friction
in Wheel--Rail Contact: A Model Comprising Interfacial Fluids, Surface Roughness
and Temperature.” Wear 271 (2011): 2–12. https://doi.org/10.1016/j.wear.2010.10.025.'
ieee: 'C. Tomberger, P. Dietmaier, W. Sextro, and K. Six, “Friction in wheel--rail
contact: A model comprising interfacial fluids, surface roughness and temperature,”
Wear, vol. 271, pp. 2–12, 2011.'
mla: 'Tomberger, Christoph, et al. “Friction in Wheel--Rail Contact: A Model Comprising
Interfacial Fluids, Surface Roughness and Temperature.” Wear, vol. 271,
2011, pp. 2–12, doi:10.1016/j.wear.2010.10.025.'
short: C. Tomberger, P. Dietmaier, W. Sextro, K. Six, Wear 271 (2011) 2–12.
date_created: 2019-05-13T11:08:32Z
date_updated: 2022-01-06T07:04:19Z
department:
- _id: '151'
doi: 10.1016/j.wear.2010.10.025
intvolume: ' 271'
keyword:
- Wheel--rail contact
- Rolling contact
- Friction
- Interfacial fluid
- Lubrication
- Surface roughness
- Contact temperature
language:
- iso: eng
page: 2 - 12
publication: Wear
publication_identifier:
issn:
- 0043-1648
quality_controlled: '1'
status: public
title: 'Friction in wheel--rail contact: A model comprising interfacial fluids, surface
roughness and temperature'
type: journal_article
user_id: '55222'
volume: 271
year: '2011'
...
---
_id: '8952'
abstract:
- lang: eng
text: In turbomachinery, friction contacts are widely used to reduce dynamic stresses
in turbine blades in order to avoid expensive damages. As a result of energy dissipation
in the friction contacts the blade vibration amplitudes are reduced. In case of
so-called friction dampers, which are pressed on the platforms of the blades by
centrifugal forces, the damping effect can be optimized by varying the damper
mass. This optimization can be done by means of a simulation model applying the
so-called component mode synthesis and the Harmonic Balance Method to reduce computation
time. It is based on the modal description of each substructure. In a real turbine
or compressor blading great differences in the magnitude of the individual blade
amplitudes occur caused by unavoidable mistuning of all system parameters like
contact parameters and natural frequencies of the blades. It may happen that most
of the blades experience only small stresses whereas a few blades experience critical
stresses. Therefore, it is necessary to consider mistuning for all system parameters
to simulate the forced response of bladed disk assemblies with friction contacts.
For a mistuned bladed disk the complete system has to be modeled to calculate
the dynamic response. In practice, usually the standard deviations instead of
the distributions of the system parameters are known. Therefore, Monte-Carlo simulations
are necessary to calculate the forced response of the blades for given mean values
and standard deviations of the system parameters. To reduce the computational
time, an approximate method has been developed and extended for small and moderate
standard deviations of the system parameters to calculate the distribution and
the envelopes of the frequency response functions for statistically varying system
parameters, in the following called statistical mistuning. The approximate method
is based on a sensitivity analysis and the assumption of a Weibull distribution
of the vibration amplitudes of the blades. Both, the approximate method and the
assumption of a Weibull distribution of the vibration amplitudes are validated
by Monte-Carlo simulations. By these investigations the influence of different
arrangements of the system parameters for given mean values and standard deviations
of the vibration amplitudes of the blades can be determined, too. For the present
investigations only a small influence of the arrangement of blades with respect
to their natural frequencies has been observed. On the other hand, an intentional
mistuning of the damper masses and the natural frequencies of the blades in a
systematic way, in the following called systematic mistuning, can be investigated
to reduce the amplitudes of the system. The simulation results of a systematic
mistuning has been validated by a test rig with a rotating bladed disk assembly
with friction dampers. The investigations show a good agreement between the simulations
and the measurements but only a slight decrease of the maximum amplitudes in case
of a systematic mistuning. Copyright {\copyright} 2004 by ASME
author:
- first_name: Florian
full_name: Götting, Florian
last_name: Götting
- first_name: Walter
full_name: Sextro, Walter
id: '21220'
last_name: Sextro
- first_name: Lars
full_name: Panning, Lars
last_name: Panning
- first_name: Karl
full_name: Popp, Karl
last_name: Popp
citation:
ama: 'Götting F, Sextro W, Panning L, Popp K. Systematic mistuning of bladed disk
assemblies with friction contacts. In: Proceedings of ASME TURBO Expo, Power
for Land, Sea, and Air. Vol 6. ; 2004:257-267.'
apa: Götting, F., Sextro, W., Panning, L., & Popp, K. (2004). Systematic mistuning
of bladed disk assemblies with friction contacts. In Proceedings of ASME TURBO
Expo, Power for Land, Sea, and Air (Vol. 6, pp. 257–267).
bibtex: '@inproceedings{Götting_Sextro_Panning_Popp_2004, title={Systematic mistuning
of bladed disk assemblies with friction contacts}, volume={6}, number={GT2004-53310},
booktitle={Proceedings of ASME TURBO Expo, Power for Land, Sea, and Air}, author={Götting,
Florian and Sextro, Walter and Panning, Lars and Popp, Karl}, year={2004}, pages={257–267}
}'
chicago: Götting, Florian, Walter Sextro, Lars Panning, and Karl Popp. “Systematic
Mistuning of Bladed Disk Assemblies with Friction Contacts.” In Proceedings
of ASME TURBO Expo, Power for Land, Sea, and Air, 6:257–67, 2004.
ieee: F. Götting, W. Sextro, L. Panning, and K. Popp, “Systematic mistuning of bladed
disk assemblies with friction contacts,” in Proceedings of ASME TURBO Expo,
Power for Land, Sea, and Air, 2004, vol. 6, no. GT2004-53310, pp. 257–267.
mla: Götting, Florian, et al. “Systematic Mistuning of Bladed Disk Assemblies with
Friction Contacts.” Proceedings of ASME TURBO Expo, Power for Land, Sea, and
Air, vol. 6, no. GT2004-53310, 2004, pp. 257–67.
short: 'F. Götting, W. Sextro, L. Panning, K. Popp, in: Proceedings of ASME TURBO
Expo, Power for Land, Sea, and Air, 2004, pp. 257–267.'
date_created: 2019-04-15T12:07:32Z
date_updated: 2022-01-06T07:04:05Z
department:
- _id: '151'
intvolume: ' 6'
issue: GT2004-53310
keyword:
- Friction
- Disks
language:
- iso: eng
page: 257-267
publication: Proceedings of ASME TURBO Expo, Power for Land, Sea, and Air
status: public
title: Systematic mistuning of bladed disk assemblies with friction contacts
type: conference
user_id: '55222'
volume: 6
year: '2004'
...
---
_id: '8915'
abstract:
- lang: eng
text: Ultrasonic linear motors have now been investigated for several years. Their
key features are high thrust forces related to their volume and good position-accuracy.
This contribution consists of two main parts. In the first part we describe the
state-of-the-art of linear piezoelectric motors. Characteristics like no-load
velocity, maximum thrust force and other technical properties of commercially
available devices will be reported as well as those of prototypes. In the second
part we report an ongoing research and development project aiming at a linear
piezoelectric motor, which is capable of surpassing some of the shortcomings of
other piezoelectric motors
author:
- first_name: Tobias
full_name: Hemsel, Tobias
id: '210'
last_name: Hemsel
- first_name: Jörg
full_name: Wallaschek, Jörg
last_name: Wallaschek
citation:
ama: 'Hemsel T, Wallaschek J. State of the art and development trends of ultrasonic
linear motors. In: Ultrasonics Symposium, 2000 IEEE. Vol 1. ; 2000:663-666
vol.1. doi:10.1109/ULTSYM.2000.922635'
apa: Hemsel, T., & Wallaschek, J. (2000). State of the art and development trends
of ultrasonic linear motors. In Ultrasonics Symposium, 2000 IEEE (Vol.
1, pp. 663–666 vol.1). https://doi.org/10.1109/ULTSYM.2000.922635
bibtex: '@inproceedings{Hemsel_Wallaschek_2000, title={State of the art and development
trends of ultrasonic linear motors}, volume={1}, DOI={10.1109/ULTSYM.2000.922635},
booktitle={Ultrasonics Symposium, 2000 IEEE}, author={Hemsel, Tobias and Wallaschek,
Jörg}, year={2000}, pages={663–666 vol.1} }'
chicago: Hemsel, Tobias, and Jörg Wallaschek. “State of the Art and Development
Trends of Ultrasonic Linear Motors.” In Ultrasonics Symposium, 2000 IEEE,
1:663–66 vol.1, 2000. https://doi.org/10.1109/ULTSYM.2000.922635.
ieee: T. Hemsel and J. Wallaschek, “State of the art and development trends of ultrasonic
linear motors,” in Ultrasonics Symposium, 2000 IEEE, 2000, vol. 1, pp.
663–666 vol.1.
mla: Hemsel, Tobias, and Jörg Wallaschek. “State of the Art and Development Trends
of Ultrasonic Linear Motors.” Ultrasonics Symposium, 2000 IEEE, vol. 1,
2000, pp. 663–66 vol.1, doi:10.1109/ULTSYM.2000.922635.
short: 'T. Hemsel, J. Wallaschek, in: Ultrasonics Symposium, 2000 IEEE, 2000, pp.
663–666 vol.1.'
date_created: 2019-04-15T09:52:09Z
date_updated: 2022-01-06T07:04:05Z
department:
- _id: '151'
doi: 10.1109/ULTSYM.2000.922635
intvolume: ' 1'
keyword:
- linear motors
- ultrasonic motors
- linear piezoelectric motor
- maximum thrust force
- no-load velocity
- ultrasonic linear motor
- Electromagnetic devices
- Electromagnetic fields
- Frequency
- Friction
- Gears
- Materials science and technology
- Piezoelectric materials
- Research and development
- Vibrations
- Wheels
language:
- iso: eng
page: 663-666 vol.1
publication: Ultrasonics Symposium, 2000 IEEE
publication_identifier:
issn:
- 1051-0117
quality_controlled: '1'
status: public
title: State of the art and development trends of ultrasonic linear motors
type: conference
user_id: '55222'
volume: 1
year: '2000'
...