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Lamb Wave Propagation
Posted May 1, 2021, 4:10 p.m. EDT Acoustics & Vibrations, Structural Mechanics, Equation-Based Modeling Version 5.6 1 Reply
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Requesting some guidance on building a model of an isotropic 2D plate undergoing ultrasonic lamb wave propagation. So far I have approached the problem by applying a timedependent, 5-cycle point load, but the proper longitudinal and shear waves (S0 and A0) are not generated. Does anyone have experience with this? I have reviewed the comsol literature but have not been successful with this yet.
Another approach would be manually generating waves with the proper group and phase speeds, but I am worried that wave-dispersion would not be modeled properly (also, I am unsure of how to impose the waves).
Please let me know if anyone has input for me-- whether it be anecdotal, perscriptive, or simply a good resource. Thanks.
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I believe there are a fair number of publications on this. For example an old one
https://users.ece.cmu.edu/~dwg/research/Waves25rev.pdf
Publications won't get you example .mph file though. And the settings required will change with different versions of Comsol.
Some advice about settings for transient analysis (5.6)
BDF solver, max order 2, min order 1, strict time stepping
If that doesn't work then (1) explain exactly how it doesn't work and (2) post your model.