Towards an Inverse Characterization of Third Order Elastic Constants Using Guided Waves
Ponschab M, Kiefer DA, Rupitsch S (2019)
Publication Type: Conference contribution
Publication year: 2019
Journal
Publisher: IEEE Computer Society
Book Volume: 2019-October
Pages Range: 1264-1268
Conference Proceedings Title: IEEE International Ultrasonics Symposium, IUS
Event location: Glasgow
ISBN: 9781728145969
DOI: 10.1109/ULTSYM.2019.8926294
Abstract
The acoustoelastic effect describes the change in propagation velocities of elastic waves due to mechanical prestress and is based on geometric and material nonlinearity. Models describing the effect heavily depend on the knowledge of the third order elastic constants (TOEC). Established acquisition methods of these constants rely on the measurement of bulk speeds of sound and analytic calculations. In this contribution, we propose an alternative method by making use of the dispersive character of guided waves in plates. Uniaxial tensile stress is applied to homogeneous metallic plates. The changes in wavenumber are calculated from laser vibrometer aided measurements. These changes depend on a trigonometric function of the direction of wave propagation and increase linearly with the prestress amplitude. Using this prior knowledge, we perform an inverse characterization of the TOEC by iteratively fitting a numerical model of the prestressed waveguide to constants of the trigonometric relation. The proposed method is verified using simulated reference data.
Authors with CRIS profile
Michael Ponschab
Lehrstuhl für Autonome Systeme und Mechatronik
Daniel Kiefer
Lehrstuhl für Autonome Systeme und Mechatronik
Stefan Rupitsch
Lehrstuhl für Autonome Systeme und Mechatronik
How to cite
APA:
Ponschab, M., Kiefer, D.A., & Rupitsch, S. (2019). Towards an Inverse Characterization of Third Order Elastic Constants Using Guided Waves. In IEEE International Ultrasonics Symposium, IUS (pp. 1264-1268). Glasgow, GB: IEEE Computer Society.
MLA:
Ponschab, Michael, Daniel A. Kiefer, and Stefan Rupitsch. "Towards an Inverse Characterization of Third Order Elastic Constants Using Guided Waves." Proceedings of the 2019 IEEE International Ultrasonics Symposium, IUS 2019, Glasgow IEEE Computer Society, 2019. 1264-1268.
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