Sarah Johannesmann - Contact (Paderborn University)

Investigation of change in dispersive behaviour during adhesive curing in multi-layered structures

H. Zeipert, C. von Germeten, O. Friesen, L. Claes, S. Johannesmann, B. Henning, in: Fortschritte der Akustik - DAGA 2023, 2023, pp. 819-822

Characterization of adhesion strength using guided ultrasonic waves

M. Nicolai, H. Zeipert, Y. Lugovtsova, J. Bulling, S. Johannesmann, J. Prager, B. Henning, in: Fortschritte der Akustik - DAGA 2023, 2023, pp. 823-826

Estimation of viscoelastic material parameters of polymers using Lamb waves

S. Johannesmann, L. Claes, B. Henning, in: Fortschritte der Akustik - DAGA 2022, 2022, pp. 1401-1404

Quantification of the adhesive coupling of layered structures using guided ultrasonic waves

M. Nicolai, H. Zeipert, Y. Lugovtsova, J. Bulling, S. Johannesmann, J. Prager, B. Henning, in: Fortschritte der Akustik - DAGA 2022, 2022, pp. 1394-1397

Inverses Verfahren zur Bestimmung viskoelastischer Materialparameter

S. Johannesmann, 2022

Lamb wave based approach to the determination of acoustic material parameters

S. Johannesmann, L. Claes, N. Feldmann, H. Zeipert, B. Henning, tm - Technisches Messen (2022), 89(7 - 8), pp. 493 - 506

Abstract

DOI

<jats:title>Abstract</jats:title> <jats:p>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.</jats:p>

Quantifying the coupling strength of adhesively bonded materials by investigating mode repulsion regions

H. Zeipert, S. Johannesmann, M. Nicolai, Y. Lugovtsova, J. Prager, B. Henning, in: Fortschritte der Akustik - DAGA 2021, 2021

К ОПРЕДЕЛЕНИЮ ПРОЧНОСТИ КЛЕЕВОГО СОЕДИНЕНИЯ В МНОГОСЛОЙНЫХ МАТЕРИАЛАХ ПУТЕМ ИССЛЕДОВАНИЯ ОБЛАСТЕЙ РАСТАЛКИВАНИЯ БЕГУЩИХ УПРУГИХ ВОЛН

Y. Lugovtsova, H. Zeipert, S. Johannesmann, M. Nicolai, J. Prager, B. Henning, in: МАТЕМАТИЧЕСКОЕ МОДЕЛИРОВАНИЕ В ЕСТЕСТВЕННЫХ НАУКАХ - XXX Всероссийская школа-конференция, 2021

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Paper - Mode Repulsion - 2021 MMEN (Perm).pdf -

Investigating peculiarities of piezoelectric detection methods for acoustic plate waves in material characterisation applications

L. Claes, H. Schmiegel, C. Grünsteidl, S. Johannesmann, M. Webersen, B. Henning, tm - Technisches Messen (2021), 88(3), pp. 147-155

Abstract

DOI

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.

Lamb wave based approach to the determination of elastic and viscoelastic material parameters

S. Johannesmann, L. Claes, B. Henning, tm - Technisches Messen (2021), 88(s1), pp. s28-s33

DOI

Measurement and Simulation of Lamb Waves in Adhesive-bonded Multilayer Systems

H. Zeipert, L. Claes, S. Johannesmann, M. Webersen, Y. Lugovtsova, J. Prager, B. Henning, 2021, pp. 91 - 92

DOI

An approach to adhesive bond characterisation using guided acoustic waves in multi-layered plates

H. Zeipert, L. Claes, S. Johannesmann, Y. Lugovtsova, M. Nicolai, J. Prager, B. Henning, at - Automatisierungstechnik (2021), pp. 962-969

Abstract

DOI

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 <jats:italic>mode repulsion</jats:italic>, 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.

Determination of Murnaghan constants of plate-shaped polymers under uniaxial tensile load

S. Johannesmann, S. Becker, M. Webersen, B. Henning, in: SMSI 2020 - Measurement Science, 2020

DOI

Characterization of the linear-acoustic material behavior of fiber-reinforced composites using lamb waves

S. Johannesmann, M. Webersen, J. Düchting, L. Claes, B. Henning, in: 45th Annual Review of Progress in Quantitative Nondestructive Evaluation , 2019

DOI

Analysis of Lamb wave mode repulsion and its implications to the characterisation of adhesive bonding strength

Y. Lugovtsova, S. Johannesmann, B. Henning, J. Prager, in: 2019 International Congress on Ultrasonics, Acoustical Society of America, 2019

DOI

Störeffektunterdrückung in 2D-Messdaten mittels DiscoGAN

S. Johannesmann, D. Springer, C. Thiel, B. Henning, in: Fortschritte der Akustik - DAGA 2019, Deutsche Gesellschaft für Akustik, 2019, pp. 1055-1058

Quantification of frequency-dependent absorption phenomena

L. Claes, S. Johannesmann, E. Baumhögger, B. Henning, in: 2019 International Congress on Ultrasonics, 2019

DOI

An acoustic waveguide-based approach to the complete characterisation of linear elastic, orthotropic material behaviour

S. Johannesmann, J. Düchting, M. Webersen, L. Claes, B. Henning, tm - Technisches Messen (2018), 2018(85), pp. 478-486

DOI

Acoustic material characterization of prestressed, plate-shaped specimens

S. Johannesmann, T. Brockschmidt, F. Rump, M. Webersen, L. Claes, B. Henning, in: Sensoren und Messsysteme, VDE Verlag GmbH, 2018, pp. 231-234

Guided ultrasonic waves for determining effective orthotropic material parameters of continuous-fiber reinforced thermoplastic plates

M. Webersen, S. Johannesmann, J. Düchting, L. Claes, B. Henning, Ultrasonics (2018), 84, pp. 53-62

DOI

Akustische Charakterisierung der richtungsabhängigen elastischen Eigenschaften faserverstärkter Kunststoffe

M. Webersen, S. Johannesmann, J. Düchting, L. Claes, B. Henning, in: Fortschritte der Akustik - DAGA 2018, 2018, pp. 1263-1266

Einfluss mechanischer Vorspannung auf das mechanische Materialverhalten von Polymeren

M. Webersen, S. Johannesmann, T. Brockschmidt, F. Rump, L. Claes, B. Henning, 2018

Viskoelastizität und Anisotropie von Kunststoffen: Ultraschallbasierte Methoden zur Materialparameterbestimmung

F. Bause, L. Claes, M. Webersen, S. Johannesmann, B. Henning, tm - Technisches Messen (2017), 84(3)

DOI

Acoustic Material Characterization of Additively Manufactured Components

L. Claes, A. Jäger, S. Johannesmann, M. Webersen, M. Kupnik, B. Henning, in: PROCEEDINGS -- AMA Conferences 2017, AMA Service GmbH, 2017, pp. 605-610

DOI

Evaluating the Influence of 3D-Printing Parameters on Acoustic Material Properties

A. Jäger, S. Johannesmann, L. Claes, M. Webersen, B. Henning, M. Kupnik, in: 2017 IEEE IUS~Proceedings, 2017

Inverser Ansatz zur akustischen Charakterisierung plattenförmiger Materialproben

S. Johannesmann, L. Claes, M. Webersen, B. Henning, in: Fortschritte der Akustik - DAGA 2017, Deutsche Gesellschaft für Akustik e.V. 2017, 2017, pp. 999-1002

Characterization of Continuous-fiber Reinforced Thermoplastics Using Thermoacoustically Excited Ultrasonic Lamb Waves

M. Webersen, S. Johannesmann, L. Claes, B. Henning, in: 2016 IEEE IUS~Proceedings, 2016

Sarah Johannesmann, M.Sc.

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