mattchoo71
Materials
- Nov 15, 2006
- 2
Hello everyone,
I am a complete newcomer to finite element modelling and am looking at vibrations on a flat panel loudspeaker.
I would like to be able to examine a material's properties to establish whether it is isotropic (it is strongly suspected to be isotropic), but am struggling with a precise answer. I've discovered that for isotropic materials there appears to be a link between Young's modulus and shear modulus and Poisson's Ratio, perhaps by :
E = 2(1 + ?)S,
with E being Young's, S being the shear and ? Poisson's Ratio. When I plug in the values I am using (below),the equation gives a close value of E (71.5x10e6), but it is not exact, as, presumably it should be.
Material properties
Dimensions : 0.63m x 0.56m x 0.018m
Mass density ? : 52 kg/m3
Youngs modulus E : 71.84x10e6 N/m2
Shear modulus S : 27.5 x10e6 N/m2
Poisson’s Ratio ? : 0.3
Damping coeff. ? : 0.05
Does anyone have a clearer method of determing a material's isotropic nature? What role does the damping coefficient play and is it related to isotropicality?
Regards,
Matt
I am a complete newcomer to finite element modelling and am looking at vibrations on a flat panel loudspeaker.
I would like to be able to examine a material's properties to establish whether it is isotropic (it is strongly suspected to be isotropic), but am struggling with a precise answer. I've discovered that for isotropic materials there appears to be a link between Young's modulus and shear modulus and Poisson's Ratio, perhaps by :
E = 2(1 + ?)S,
with E being Young's, S being the shear and ? Poisson's Ratio. When I plug in the values I am using (below),the equation gives a close value of E (71.5x10e6), but it is not exact, as, presumably it should be.
Material properties
Dimensions : 0.63m x 0.56m x 0.018m
Mass density ? : 52 kg/m3
Youngs modulus E : 71.84x10e6 N/m2
Shear modulus S : 27.5 x10e6 N/m2
Poisson’s Ratio ? : 0.3
Damping coeff. ? : 0.05
Does anyone have a clearer method of determing a material's isotropic nature? What role does the damping coefficient play and is it related to isotropicality?
Regards,
Matt
