---
_id: '33356'
abstract:
- lang: eng
  text: By monitoring the recoating process within polymer laser sintering production,
    it was shown that multiple powder-spread-flaws can be detected. Those groove-like
    flaws are expected to be the result of agglomerates jamming between the recoater
    and the last powder layer. This work is analyzing the interaction between powder-spread-flaws
    and part properties, showing the influence of the recoating process on the performance
    of laser sintering parts. Therefore, artificial powder-spread-flaws are applied
    to the build jobs of tensile test specimens which are measured and analyzed regarding
    the elongation at break, strength and fracture position. For the characteristics
    of the flaws, the artificial grooves are varied in depth and width. Furthermore,
    the position of the flaw is changed form mid part to close to surface areas. It
    was shown, that several flaws are visible at the part surface, resulting in stress
    concentration and reduced performance. But there are as well parts with flaw-layers,
    which are not visible after the build process on the part. Those parts can have
    significantly reduced mechanical properties as well.
author:
- first_name: Sven Helge
  full_name: Klippstein, Sven Helge
  id: '71545'
  last_name: Klippstein
- first_name: Hans-Joachim
  full_name: Schmid, Hans-Joachim
  id: '464'
  last_name: Schmid
  orcid: 000-0001-8590-1921
citation:
  ama: 'Klippstein SH, Schmid H-J. Powder Spread Flaws in Polymer Laser Sintering
    and its Influences on Mechanical Performance. In: <i>Proceedings of the 33nd Annual
    International Solid Freeform Fabrication Symposium</i>. ; 2022.'
  apa: Klippstein, S. H., &#38; Schmid, H.-J. (2022). Powder Spread Flaws in Polymer
    Laser Sintering and its Influences on Mechanical Performance. <i>Proceedings of
    the 33nd Annual International Solid Freeform Fabrication Symposium</i>.
  bibtex: '@inproceedings{Klippstein_Schmid_2022, place={Austin, TX, USA}, title={Powder
    Spread Flaws in Polymer Laser Sintering and its Influences on Mechanical Performance},
    booktitle={Proceedings of the 33nd Annual International Solid Freeform Fabrication
    Symposium}, author={Klippstein, Sven Helge and Schmid, Hans-Joachim}, year={2022}
    }'
  chicago: Klippstein, Sven Helge, and Hans-Joachim Schmid. “Powder Spread Flaws in
    Polymer Laser Sintering and Its Influences on Mechanical Performance.” In <i>Proceedings
    of the 33nd Annual International Solid Freeform Fabrication Symposium</i>. Austin,
    TX, USA, 2022.
  ieee: S. H. Klippstein and H.-J. Schmid, “Powder Spread Flaws in Polymer Laser Sintering
    and its Influences on Mechanical Performance,” 2022.
  mla: Klippstein, Sven Helge, and Hans-Joachim Schmid. “Powder Spread Flaws in Polymer
    Laser Sintering and Its Influences on Mechanical Performance.” <i>Proceedings
    of the 33nd Annual International Solid Freeform Fabrication Symposium</i>, 2022.
  short: 'S.H. Klippstein, H.-J. Schmid, in: Proceedings of the 33nd Annual International
    Solid Freeform Fabrication Symposium, Austin, TX, USA, 2022.'
date_created: 2022-09-13T16:42:10Z
date_updated: 2023-05-04T08:31:49Z
department:
- _id: '150'
- _id: '624'
- _id: '219'
keyword:
- Selective Sasersintering
- Process Monitoring
- Powder Spread
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://utw10945.utweb.utexas.edu/sites/default/files/2022/Powder%20Spread%20Flaws%20in%20Polymer%20Laser%20Sintering%20and.pdf
oa: '1'
place: Austin, TX, USA
publication: Proceedings of the 33nd Annual International Solid Freeform Fabrication
  Symposium
quality_controlled: '1'
status: public
title: Powder Spread Flaws in Polymer Laser Sintering and its Influences on Mechanical
  Performance
type: conference
user_id: '464'
year: '2022'
...
---
_id: '9783'
abstract:
- lang: eng
  text: To optimize the ultrasound irradiation for cavitation based ultrasound applications
    like sonochemistry or ultrasound cleaning, the correlation between cavitation
    intensity and the resulting effect on the process is of interest. Furthermore,
    changing conditions like temperature and pressure result in varying acoustic properties
    of the liquid. That might necessitate an adaption of the ultrasound irradiation.
    To detect such changes during operation, process monitoring is desired. Labor
    intensive processes, that might be carried out for several hours, also require
    process monitoring to increase their reliability by detection of changes or malfunctions
    during operation. In some applications cavitation detection and monitoring can
    be achieved by the application of sensors in the sound field. Though the application
    of sensors is possible, this necessitates modifications on the system and the
    sensor might disturb the sound field. In other applications harsh, process conditions
    prohibit the application of sensors in the sound field. Therefore alternative
    techniques for cavitation detection and monitoring are desired. The applicability
    of an external microphone and a self-sensing ultrasound transducer for cavitation
    detection were experimentally investigated. Both methods were found to be suitable
    and easily applicable.
author:
- first_name: Peter
  full_name: Bornmann, Peter
  last_name: Bornmann
- first_name: Tobias
  full_name: Hemsel, Tobias
  id: '210'
  last_name: Hemsel
- first_name: Walter
  full_name: Sextro, Walter
  id: '21220'
  last_name: Sextro
- first_name: Takafumi
  full_name: Maeda, Takafumi
  last_name: Maeda
- first_name: Takeshi
  full_name: Morita, Takeshi
  last_name: Morita
citation:
  ama: 'Bornmann P, Hemsel T, Sextro W, Maeda T, Morita T. Non-perturbing cavitation
    detection / monitoring in sonochemical reactors. In: <i>Ultrasonics Symposium
    (IUS), 2012 IEEE International</i>. ; 2012:1141-1144. doi:<a href="https://doi.org/10.1109/ULTSYM.2012.0284">10.1109/ULTSYM.2012.0284</a>'
  apa: Bornmann, P., Hemsel, T., Sextro, W., Maeda, T., &#38; Morita, T. (2012). Non-perturbing
    cavitation detection / monitoring in sonochemical reactors. In <i>Ultrasonics
    Symposium (IUS), 2012 IEEE International</i> (pp. 1141–1144). <a href="https://doi.org/10.1109/ULTSYM.2012.0284">https://doi.org/10.1109/ULTSYM.2012.0284</a>
  bibtex: '@inproceedings{Bornmann_Hemsel_Sextro_Maeda_Morita_2012, title={Non-perturbing
    cavitation detection / monitoring in sonochemical reactors}, DOI={<a href="https://doi.org/10.1109/ULTSYM.2012.0284">10.1109/ULTSYM.2012.0284</a>},
    booktitle={Ultrasonics Symposium (IUS), 2012 IEEE International}, author={Bornmann,
    Peter and Hemsel, Tobias and Sextro, Walter and Maeda, Takafumi and Morita, Takeshi},
    year={2012}, pages={1141–1144} }'
  chicago: Bornmann, Peter, Tobias Hemsel, Walter Sextro, Takafumi Maeda, and Takeshi
    Morita. “Non-Perturbing Cavitation Detection / Monitoring in Sonochemical Reactors.”
    In <i>Ultrasonics Symposium (IUS), 2012 IEEE International</i>, 1141–44, 2012.
    <a href="https://doi.org/10.1109/ULTSYM.2012.0284">https://doi.org/10.1109/ULTSYM.2012.0284</a>.
  ieee: P. Bornmann, T. Hemsel, W. Sextro, T. Maeda, and T. Morita, “Non-perturbing
    cavitation detection / monitoring in sonochemical reactors,” in <i>Ultrasonics
    Symposium (IUS), 2012 IEEE International</i>, 2012, pp. 1141–1144.
  mla: Bornmann, Peter, et al. “Non-Perturbing Cavitation Detection / Monitoring in
    Sonochemical Reactors.” <i>Ultrasonics Symposium (IUS), 2012 IEEE International</i>,
    2012, pp. 1141–44, doi:<a href="https://doi.org/10.1109/ULTSYM.2012.0284">10.1109/ULTSYM.2012.0284</a>.
  short: 'P. Bornmann, T. Hemsel, W. Sextro, T. Maeda, T. Morita, in: Ultrasonics
    Symposium (IUS), 2012 IEEE International, 2012, pp. 1141–1144.'
date_created: 2019-05-13T13:18:49Z
date_updated: 2022-01-06T07:04:20Z
department:
- _id: '151'
doi: 10.1109/ULTSYM.2012.0284
keyword:
- cavitation
- chemical reactors
- microphones
- process monitoring
- reliability
- ultrasonic applications
- ultrasonic waves
- acoustic properties
- cavitation based ultrasound applications
- cavitation intensity
- change detection reliability
- external microphone
- malfunction detection reliability
- nonperturbing cavitation detection
- nonperturbing cavitation monitoring
- process monitoring
- self-sensing ultrasound transducer
- sonochemical reactors
- sonochemistry
- ultrasound cleaning
- ultrasound irradiation
- Acoustics
- Liquids
- Monitoring
- Sensors
- Sonar equipment
- Transducers
- Ultrasonic imaging
language:
- iso: eng
page: 1141-1144
publication: Ultrasonics Symposium (IUS), 2012 IEEE International
publication_identifier:
  issn:
  - 1948-5719
quality_controlled: '1'
status: public
title: Non-perturbing cavitation detection / monitoring in sonochemical reactors
type: conference
user_id: '55222'
year: '2012'
...