Micromechanics of High Strain Rate Loaded Composite Media

[FutureEngineer1720]

TL;DR

In Composite materials, How does the wave propagation depends on the physical parameters ( fibre orientation, fibre volumetric fraction, relative fibre modulli etc)?

I would like to know some guidelines regarding this topic. The characteristics of wave propagation depend highly on the orientation of fibre (unidirectional and warp & weft arrangement), fibre volumetric fraction, relative fibre modulli etc. What is the relation of wave propagation and these parameters? I need analysis or At-least a guideline on how to start the analysis? Since I'll be looking things from a micromechanical viewpoint, it will probably be best to start from analysing a unit cell starting from SDOF and then moving to MDOF. Analysis is needed for two cases (1) Unidirectional and (2) woven (with warp and wefts). Any tips or literature on this subject will be highly appreciated.

 

[Baluncore]

For low frequency waves a composite will have a slightly higher loss than an isotropic material, but it can be treated as an isotropic material as far as the longest wavelengths are concerned.
For high frequency (ultrasonic) signals, when the dimensions of the fabric start to be similar to the wavelength you will have an array of embeded scatterers with a critical wavelength sensitive behaviour.

If the acoustic impedance of the tensile? and compressive? constituents differ there will be internal reflection and damping of waves.
If the tensile components are not initially under tension there may be a non-linear response to waves resulting in odd harmonic generation, plus even harmonics if slightly bent.

Waves will travel in the faster material with energy being lost into the slower component of the composite material. Expect the speed of sound to be fibre orientation dependent.

You need to be more specific about the composition, dimensions and the wavelength or bandwidth of interest before we can guess what will be most important.