IFC 4.3.x development

8.10.3.5 IfcMaterialDefinition

Change log

IFC4

added

8.10.3.5.1 Semantic definitions at the entity

IfcMaterialDefinition is a general supertype for all material related information items in IFC that have common material related properties that may include association of material with some shape parameters or assignments to identified parts of a component.

There are three ways of assigning materials to a single component or multiple components; they are characterized as:

  • by layer - assigning a material to a layer with constant thickness
  • by profile - assigning a material to a profile with a constant of varying shape along an extrusion
  • by constituents - assigning a material to an identified part of a component shape; the identification is by a keyword rather than by a shape parameter

Each instantiable subtype of IfcMaterialDefinition may have material properties assigned, or have an external classification of its definition. It can be assigned to either a subtype of IfcElement, or a subtype of IfcElementType by using the objectified relationship IfcRelAssociatesMaterial.

HISTORY  New entity in IFC4

8.10.3.5.1 Attributes

# Attribute Type Description
IfcMaterialDefinition
AssociatedTo SET [0:?] OF IfcRelAssociatesMaterial FOR RelatingMaterial Use of the IfcMaterialDefinition subtypes within the material association of an element occurrence or element type. The association is established by the IfcRelAssociatesMaterial relationship.

> IFC4 CHANGE  The inverse attribute has been added.
HasExternalReferencesSET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjectsReference to external references, e.g. library, classification, or document information, that are associated to the material.

> IFC4 CHANGE  The inverse attribute has been added.
HasProperties SET [0:?] OF IfcMaterialProperties FOR Material Material properties assigned to instances of subtypes of IfcMaterialDefinition.

> IFC4 CHANGE  The inverse attribute has been added.

8.10.3.5.2 Entity inheritance

dot_inheritance IfcMaterialDefinition_children 6 more... IfcMaterialDefinition IfcMaterialDefinition IfcMaterialDefinition_children->IfcMaterialDefinition

8.10.3.5.3 Formal representations

ENTITY IfcMaterialDefinition
 ABSTRACT SUPERTYPE OF (ONEOF
	(IfcMaterial
	,IfcMaterialConstituent
	,IfcMaterialConstituentSet
	,IfcMaterialLayer
	,IfcMaterialLayerSet
	,IfcMaterialProfile
	,IfcMaterialProfileSet));
 INVERSE
	AssociatedTo : SET [0:?] OF IfcRelAssociatesMaterial FOR RelatingMaterial;
	HasExternalReferences : SET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects;
	HasProperties : SET [0:?] OF IfcMaterialProperties FOR Material;
END_ENTITY;