Creates a material attribute for volumetric crushing model (Mdl=81)
| attrName | string | name of attribute |
| bIsVolumetric | boolean | volumetric crushing indicator |
| bulkModulus | double | bulk modulus |
| shearModulus | double | Shear modulus |
| massDensity | double | density |
| thermalExp | double | coefficeint of thermal expansion |
| massRayleigh | double | Mass Rayleigh damping constant |
| stiffRayleigh | double | Stiffness Rayleigh damping constant |
| heatFraction | double | Heat fraction coefficient |
| cutOffPressure | double | Cut off pressure |
| pressureDepend0 | double | Parameter defining pressure dependent yield stress |
| pressureDepend1 | double | Parameter defining pressure dependent yield stress |
| pressureDepend2 | double | Parameter defining pressure dependent yield stress |
| Return value | IFVolumeCrushingMaterial |
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