Numerical investigation on the relationship between the acoustoelastic effect and the modal properties of Lamb waves in aluminium
Publication date
2023
Document type
Konferenzbeitrag
Author
Organisational unit
Conference
10th ECCOMAS Thematic Conference on Smart Structures and Materials (ECOMAS SMART 2023) ; Patras, Greece ; July 3–5, 2023
Publisher
University of Patras
Book title
SMART 2023
First page
83
Last page
94
Peer-reviewed
✅
Part of the university bibliography
✅
Language
English
Abstract
An in-service monitoring of structures with guided ultrasonic waves like Lamb waves always includes an interaction of the wave with a certain internal stress state.The interaction leads to a change of the phase velocity and hence, the propagation properties.To investigate the driving influences with respect to the numerical modeling in more detail a modal analysis is utilized to derive the displacement field components and the participation factors for a prestressed aluminum wave guide over a frequency range of up to 4 MHz mm.Subsequently, both quantities are combined.Finally, the obtained curves for Γ j ûi are compared with the course of the phase velocity change due to a pre-stress state of 10 MPa derived by the Neo-Hookean and Murnaghan material models.The comparison reveals a correlation between the relative displacement component in combination with the modal participation factor in the direction of the wave propagation on the one hand side and the behavior of the phase velocity under uniaxial tensile load on the other side.It appears that the out-of-plane component is predominant for the Murnaghan material model, whereas the Neo-Hookean material model ensures a more balanced representation of both in-and out-of-plane component.
Version
Published version
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