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Get shear wave speed in elastic module

Posted 2025/02/12 2:13 JST Materials, Results & Visualization, Physics Interfaces Version 6.3 1 Reply

Sergio Martinez
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Hi, recently I started to work with the Elastic Waves module. My goal is to get the shear wave speed in a gelatinous material. In the attached file I'm using a material with:

  • Density (rho) 1000 kg/m^3
  • Young's Modulus (E) 8.333 kPa
  • Poisson's ratio (nu) 0.4999

These are the equations I'm using in order to get the E for a specific cs

So, for 8.333 kPa I should get 5 m/s, but the cs plot computes 1.67 m/s for the material. Why?

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1 Reply Last Post 2025/02/12 21:57 JST
Henrik Sönnerlind COMSOL Employee

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Posted: 6 months ago 2025/02/12 21:57 JST

I don't at all understand your math, but

-------------------
Henrik Sönnerlind
COMSOL
I don't at all understand your math, but c_s = \sqrt{\frac{G}{\rho}} = \; \{ \textrm {Incompressible}\} \; = \sqrt{\frac{E}{3\rho}} = \sqrt{\frac{8.333\cdot 10^3}{3 \cdot 1000}} = \sqrt{\frac{8.333}{3}} = 1.67

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