Learning Forum

[mhaseeb]

Hi community members, I hope everyone is doing great.

Recently, I was trying to simulate an experiment of LAMB wave propagation through a thin composite plate (with four PZT sensors on corners, one activated at a time, other act as receivers) using LS-PrePost and needed general guidance. In experiment, the composite plate is held on a foam like material, under the influence of gravity only and its one corner is displaced by a very fine loading curve. While simulating, I was confused about...
1. Should I model the lower foam like material too (or is there any other way around)
2. What will be the approprite boundary condition for the plate to keep it resting like that (as in the experiment)
3. Any other helpful advice will be appreciated :)

Thanks for your time.
Have a great day!

[Erik Kostson]

 

HI

Very often plates can be physically clamped in a fixture/frame and in FE are just considered free free (so no BC except of force loading excitation say e.g., for a PZT).

See the below and others on experimetal and FE work on guided ultrasonic waves including Lamb waves in composites (UCL thesis):

https://www.imperial.ac.uk/non-destructive-evaluation/publications/phd-theses/

https://discovery.ucl.ac.uk/1469777/1/Bibi_FinalThesis_30April15_corrected8July2015.pdf

All the best

Erik