@inproceedings{43233, author = {{Zeipert, Henning and von Germeten, Christian and Friesen, Olga and Claes, Leander and Johannesmann, Sarah and Henning, Bernd}}, booktitle = {{Fortschritte der Akustik - DAGA 2023}}, location = {{Hamburg}}, pages = {{819--822}}, title = {{{Investigation of change in dispersive behaviour during adhesive curing in multi-layered structures}}}, year = {{2023}}, } @inproceedings{43234, author = {{Nicolai, Marcel and Zeipert, Henning and Lugovtsova, Yevgeniya and Bulling, Jannis and Johannesmann, Sarah and Prager, Jens and Henning, Bernd}}, booktitle = {{Fortschritte der Akustik - DAGA 2023}}, location = {{Hamburg}}, pages = {{823--826}}, title = {{{Characterization of adhesion strength using guided ultrasonic waves}}}, year = {{2023}}, } @inproceedings{6590, author = {{Nicolai, Marcel and Zeipert, Henning and Lugovtsova, Yevgeniya and Bulling, Jannis and Johannesmann, Sarah and Prager, Jens and Henning, Bernd}}, booktitle = {{Fortschritte der Akustik - DAGA 2022}}, location = {{Stuttgart}}, pages = {{1394--1397}}, title = {{{Quantification of the adhesive coupling of layered structures using guided ultrasonic waves}}}, year = {{2022}}, } @article{30863, abstract = {{Abstract In this paper a measurement procedure to identify viscoelastic material parameters of plate-like samples using broadband ultrasonic waves is presented. Ultrasonic Lamb waves are excited via the thermoelastic effect using laser radiation and detected by a piezoelectric transducer. The resulting measurement data is transformed to yield information about multiple propagating Lamb waves as well as their attenuation. These results are compared to simulation results in an inverse procedure to identify the parameters of an elastic and a viscoelastic material model.}}, author = {{Johannesmann, Sarah and Claes, Leander and Feldmann, Nadine and Zeipert, Henning and Henning, Bernd}}, issn = {{2196-7113}}, journal = {{tm - Technisches Messen}}, keywords = {{Electrical and Electronic Engineering, Instrumentation}}, number = {{7 - 8}}, pages = {{493 -- 506}}, publisher = {{Walter de Gruyter GmbH}}, title = {{{Lamb wave based approach to the determination of acoustic material parameters}}}, doi = {{10.1515/teme-2021-0134}}, volume = {{89}}, year = {{2022}}, } @inproceedings{6588, author = {{Johannesmann, Sarah and Claes, Leander and Henning, Bernd}}, booktitle = {{Fortschritte der Akustik - DAGA 2022}}, location = {{Stuttgart}}, pages = {{1401--1404}}, title = {{{Estimation of viscoelastic material parameters of polymers using Lamb waves}}}, year = {{2022}}, } @misc{6560, author = {{Johannesmann, Sarah}}, title = {{{Inverses Verfahren zur Bestimmung viskoelastischer Materialparameter}}}, year = {{2022}}, } @inproceedings{26033, author = {{Zeipert, Henning and Johannesmann, Sarah and Nicolai, Marcel and Lugovtsova, Yevgeniya and Prager, Jens and Henning, Bernd}}, booktitle = {{Fortschritte der Akustik - DAGA 2021}}, location = {{Wien}}, title = {{{Quantifying the coupling strength of adhesively bonded materials by investigating mode repulsion regions}}}, year = {{2021}}, } @inproceedings{27847, author = {{Lugovtsova, Yevgeniya and Zeipert, Henning and Johannesmann, Sarah and Nicolai, Marcel and Prager, Jens and Henning, Bernd}}, booktitle = {{МАТЕМАТИЧЕСКОЕ МОДЕЛИРОВАНИЕ В ЕСТЕСТВЕННЫХ НАУКАХ - XXX Всероссийская школа-конференция}}, location = {{Perm}}, title = {{{К ОПРЕДЕЛЕНИЮ ПРОЧНОСТИ КЛЕЕВОГО СОЕДИНЕНИЯ В МНОГОСЛОЙНЫХ МАТЕРИАЛАХ ПУТЕМ ИССЛЕДОВАНИЯ ОБЛАСТЕЙ РАСТАЛКИВАНИЯ БЕГУЩИХ УПРУГИХ ВОЛН}}}, year = {{2021}}, } @article{21067, abstract = {{Acoustic waves in plates have proven a viable tool for testing and material characterisation purposes. There are a multitude of options for excitation and detection of theses waves, such as optical and piezoelectric systems. While optical systems, with thermoelastic excitation and interferometric detection, have the benefit of being contactless, they usually require rather complex and expensive experimental setups. Piezoelectric systems are more easily realised but require direct contact with the specimen and usually have a limited bandwidth, especially in case of piezoelectric excitation. In this work, the authors compare the properties of piezoelectric and optical detection methods for broad-band acoustic signals. The shape (e. g. the displacement) of a propagating plate wave is given by its frequency and wave number, allowing to investigate correlations between mode shapes and received signal strengths. This is aided by evaluations in normalised frequency and wavenumber space, facilitating comparisons of different specimens. Further, the authors explore possibilities to utilise the specific properties of the detection methods to determine acoustic material parameters.}}, author = {{Claes, Leander and Schmiegel, Hanna and Grünsteidl, Clemens and Johannesmann, Sarah and Webersen, Manuel and Henning, Bernd}}, issn = {{2196-7113}}, journal = {{tm - Technisches Messen}}, number = {{3}}, pages = {{147--155}}, title = {{{Investigating peculiarities of piezoelectric detection methods for acoustic plate waves in material characterisation applications}}}, doi = {{10.1515/teme-2020-0098}}, volume = {{88}}, year = {{2021}}, } @article{23791, author = {{Johannesmann, Sarah and Claes, Leander and Henning, Bernd}}, journal = {{tm - Technisches Messen}}, number = {{s1}}, pages = {{s28--s33}}, publisher = {{Walter de Gruyter {GmbH}}}, title = {{{Lamb wave based approach to the determination of elastic and viscoelastic material parameters}}}, doi = {{10.1515/teme-2021-0070}}, volume = {{88}}, year = {{2021}}, } @inproceedings{22013, author = {{Zeipert, Henning and Claes, Leander and Johannesmann, Sarah and Webersen, Manuel and Lugovtsova, Yevgeniya and Prager, Jens and Henning, Bernd}}, location = {{Nürnberg}}, pages = {{91 -- 92}}, title = {{{Measurement and Simulation of Lamb Waves in Adhesive-bonded Multilayer Systems}}}, doi = {{10.5162/SMSI2021/A8.2}}, year = {{2021}}, } @article{27367, abstract = {{An approach for the non-destructive characterisation of adhesive bonds using guided ultrasonic waves is presented. Pulsed laser radiation is used to thermoacoustically excite broadband ultrasonic waves in a multi-layered sample, consisting of a metal plate adhesively joined to a polymeric layer using synthetic resin. The resulting signals are received by a purpose-built piezoelectric transducer. Varying the distance between excitation and detection yields spatio-temporal measurement data, from which the dispersive properties of the propagating waves can be inferred using a two-dimensional Fourier transform, assuming the plates to act as coupled waveguides. Coupled multi-layered waveguides show an effect referred to as mode repulsion, where the distance between certain modes in the frequency-wavenumber domain is assumed to be a measure of coupling strength. Measurements at different stages of curing of the adhesive layer are performed and evaluated. A comparison of the results shows changes in the dispersive properties, namely an increased modal bandwidth for the fully cured sample as well as an increased modal distance.}}, author = {{Zeipert, Henning and Claes, Leander and Johannesmann, Sarah and Lugovtsova, Yevgeniya and Nicolai, Marcel and Prager, Jens and Henning, Bernd}}, issn = {{2196-677X}}, journal = {{at - Automatisierungstechnik}}, pages = {{962--969}}, title = {{{An approach to adhesive bond characterisation using guided acoustic waves in multi-layered plates}}}, doi = {{10.1515/auto-2021-0089}}, year = {{2021}}, } @inproceedings{15264, author = {{Johannesmann, Sarah and Becker, Sebastian and Webersen, Manuel and Henning, Bernd}}, booktitle = {{SMSI 2020 - Measurement Science}}, isbn = {{978-3-9819376-2-6}}, location = {{Nuremberg}}, title = {{{Determination of Murnaghan constants of plate-shaped polymers under uniaxial tensile load}}}, doi = {{10.5162/SMSI2020/D6.1}}, year = {{2020}}, } @inproceedings{9718, author = {{Johannesmann, Sarah and Webersen, Manuel and Düchting, Julia and Claes, Leander and Henning, Bernd}}, booktitle = {{45th Annual Review of Progress in Quantitative Nondestructive Evaluation }}, location = {{Burlington}}, title = {{{Characterization of the linear-acoustic material behavior of fiber-reinforced composites using lamb waves}}}, doi = {{10.1063/1.5099742}}, volume = {{38}}, year = {{2019}}, } @inproceedings{15261, author = {{Lugovtsova, Yevgeniya and Johannesmann, Sarah and Henning, Bernd and Prager, Jens}}, booktitle = {{2019 International Congress on Ultrasonics}}, location = {{Bruges}}, publisher = {{Acoustical Society of America}}, title = {{{Analysis of Lamb wave mode repulsion and its implications to the characterisation of adhesive bonding strength}}}, doi = {{10.1121/2.0001074}}, year = {{2019}}, } @inproceedings{10042, author = {{Johannesmann, Sarah and Springer, Dimitri and Thiel, Christian and Henning, Bernd}}, booktitle = {{Fortschritte der Akustik - DAGA 2019}}, editor = {{Gesellschaft für Akustik e.V., Deutsche}}, location = {{Rostock}}, pages = {{1055--1058}}, publisher = {{Deutsche Gesellschaft für Akustik}}, title = {{{Störeffektunterdrückung in 2D-Messdaten mittels DiscoGAN}}}, volume = {{45}}, year = {{2019}}, } @inproceedings{13647, author = {{Claes, Leander and Johannesmann, Sarah and Baumhögger, Elmar and Henning, Bernd}}, booktitle = {{2019 International Congress on Ultrasonics}}, location = {{Bruges}}, title = {{{Quantification of frequency-dependent absorption phenomena}}}, doi = {{10.1121/2.0001043}}, year = {{2019}}, } @article{6567, author = {{Johannesmann, Sarah and Düchting, Julia and Webersen, Manuel and Claes, Leander and Henning, Bernd}}, issn = {{0171-8096}}, journal = {{tm - Technisches Messen}}, keywords = {{Continous-fibre reinforced plastics, material parameters, orthotropy, ultrasonics}}, number = {{85}}, pages = {{478--486}}, title = {{{An acoustic waveguide-based approach to the complete characterisation of linear elastic, orthotropic material behaviour}}}, doi = {{10.1515/teme-2017-0132}}, volume = {{2018}}, year = {{2018}}, } @inproceedings{6568, author = {{Johannesmann, Sarah and Brockschmidt, Tobias and Rump, Friedhelm and Webersen, Manuel and Claes, Leander and Henning, Bernd}}, booktitle = {{Sensoren und Messsysteme}}, pages = {{231--234}}, publisher = {{VDE Verlag GmbH}}, title = {{{Acoustic material characterization of prestressed, plate-shaped specimens}}}, year = {{2018}}, } @article{6577, author = {{Webersen, Manuel and Johannesmann, Sarah and Düchting, Julia and Claes, Leander and Henning, Bernd}}, journal = {{Ultrasonics}}, pages = {{53--62}}, title = {{{Guided ultrasonic waves for determining effective orthotropic material parameters of continuous-fiber reinforced thermoplastic plates}}}, doi = {{10.1016/j.ultras.2017.10.005}}, volume = {{84}}, year = {{2018}}, }