Li & Faltinsen (2012) developed a 3D-beam theory for structural deformation which can be used to calculate shear strains,

Also this masters thesis discusses a lot on the subject

Loads on the Gravity-net-cage from

Waves and Currents

Ida Håøy Grue

Hope that helps a little.

I will look for the details, thank you so much.

Dharma

@ Dharma

See the principles and techniques of elastography and sonoelastography. They use ultrasonic techniques to measure the shear strain and accordingly characterize the material.

Yes, if you change the layer, then the new constitutive relation and wave equation will have viscous parameter of the lipid layer in them, whose stress is given as, stress = viscosity * rate of strain change with respect to time.

Thanks for the response Vikas, I will look for further details.