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## Related Questions

###### Asked in Physics

### Modulus of rigidity?

###### Asked in Mechanical Engineering, Steam Engines

### What is modulus of rigidity?

Just as the modulus of elasticity , E, relates tensile stress to
tensile strain, the modulus of rigidity, G, relates shear stress to
shear strain.
The modulus of rigidity, G, is, for isotropic materials, related
to E as
G = E/ (2(1+u)) where u = poisson ratio which varies from 0 to
0.5 and is usually 0.25-0.33 for many metals.
tensile stress = Ee e = tensile strain
shear stress = Gk k = shear strain

###### Asked in Mechanical Engineering, Solid State Physics

### Is there any rigidity modulus for fluids?

Fluids, such as water, are nearly incompressible, and exhibit a
bulk modulus of about 300,000 psi (2 GPa). That means that if
confined itis diffuclt to compress. It also means taht poisson
ratio is near 0.5, the maximum
For modulus of rigidity and elastic modulus, those values are
essentially 0.
Note that if E = elastic modulus and K = bulk modulus, and u =
poisson ratio, then
E = 3K(1-2u) = 3K(0) = 0