IfcMechanicalMaterialProperties

Definition from IAI: This is a collection of mechanical material properties normally used for structural analysis purpose. It contains all properties which are independent of the actual material type.

> HISTORY: New entity in Release IFC2x.

EXPRESS specification:

ENTITY IfcMechanicalMaterialProperties
SUPERTYPE OF | (ONEOF(IfcMechanicalSteelMaterialProperties, IfcMechanicalConcreteMaterialProperties))
SUBTYPE OF ( | IfcMaterialProperties);
DynamicViscosity | : | OPTIONAL IfcDynamicViscosityMeasure;
YoungModulus | : | OPTIONAL IfcModulusOfElasticityMeasure;
ShearModulus | : | OPTIONAL IfcModulusOfElasticityMeasure;
PoissonRatio | : | OPTIONAL IfcPositiveRatioMeasure;
ThermalExpansionCoefficient | : | OPTIONAL IfcThermalExpansionCoefficientMeasure;
UNIQUE
UR11 | : | Material;
WHERE
WR21 | : | NOT(EXISTS(YoungModulus)) OR (YoungModulus >= 0.0);
WR22 | : | NOT(EXISTS(ShearModulus)) OR (ShearModulus >= 0.0);
END_ENTITY;

Attribute definitions:

DynamicViscosity | : | A measure of the viscous resistance of the material.
YoungModulus | : | A measure of the Young’s modulus of elasticity of the material.
ShearModulus | : | A measure of the shear modulus of elasticity of the material.
PoissonRatio | : | A measure of the lateral deformations in the elastic range.
ThermalExpansionCoefficient | : | A measure of the expansion coefficient for warming up the material about one Kelvin.

Formal Propositions:

WR21 | : | Young modulus of a material may not be negative.
WR22 | : | Shear modulus of a material may not be negative.

Inheritance graph

ENTITY IfcMechanicalMaterialProperties;
ENTITY IfcMaterialProperties;
Material | : | IfcMaterial;
ENTITY IfcMechanicalMaterialProperties;
DynamicViscosity | : | OPTIONAL IfcDynamicViscosityMeasure;
YoungModulus | : | OPTIONAL IfcModulusOfElasticityMeasure;
ShearModulus | : | OPTIONAL IfcModulusOfElasticityMeasure;
PoissonRatio | : | OPTIONAL IfcPositiveRatioMeasure;
ThermalExpansionCoefficient | : | OPTIONAL IfcThermalExpansionCoefficientMeasure;
END_ENTITY;