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;