IFC 4.3.x development

8.10.3.1 IfcMaterial

Change log

IFC4

additionsattributesCategory
additionsattributesDescription

8.10.3.1.1 Semantic definitions at the entity

IfcMaterial is a homogeneous or inhomogeneous substance that can be used to form elements (physical products or their components).

IfcMaterial is the basic entity for material designation and definition; this includes identification by name and classification (via reference to an external classification), as well as association of material properties (isotropic or anisotropic) defined by (subtypes of) IfcMaterialProperties. An instance of IfcMaterial may be associated to an element or element type using the IfcRelAssociatesMaterial relationship. The assignment might either be direct as a single material information, or via

  • a material layer set
  • a material profile set
  • a material constituent set

An IfcMaterial may also have presentation information associated. Such presentation information is provided by IfcMaterialDefinitionRepresentation, associating curve styles, hatching definitions or surface colouring/rendering information to a material.

HISTORY New entity in IFC4

IFC4 CHANGE  The attributes Description and Category have been added.

8.10.3.1.1 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.
IfcMaterial
1 Name IfcLabel Name of the material.

> EXAMPLE A view definition may require _Material.Name_ to uniquely specify e.g. concrete or steel grade, in which case the attribute Material.Category could take the value 'Concrete' or 'Steel'.

> NOTE  Material grade may have different meaning in different view definitions, e.g. strength grade for structural design and analysis, or visible appearance grade in architectural application. Also, more elaborate material grade definition may be associated as classification via inverse attribute HasExternalReferences.
2 Description OPTIONAL IfcText Definition of the material in more descriptive terms than given by attributes Name or Category.

> IFC4 CHANGE  The attribute has been added at the end of attribute list.
3 Category OPTIONAL IfcLabel Definition of the category (group or type) of material, in more general terms than given by attribute Name.

> EXAMPLE A view definition may require each _Material.Name_ to be unique, e.g. for each concrete or steel grade used in a project, in which case _Material.Category_ could take the values 'Concrete' or 'Steel'.

> IFC4 CHANGE  The attribute has been added at the end of attribute list.
HasRepresentation SET [0:1] OF IfcMaterialDefinitionRepresentation FOR RepresentedMaterialReference to the IfcMaterialDefinitionRepresentation that provides presentation information to a representation common to this material in style definitions.



> IFC2x3 CHANGE  The inverse attribute HasRepresentation has been added.
IsRelatedWith SET [0:?] OF IfcMaterialRelationship FOR RelatedMaterials Reference to a material relationship indicating that this material is a part (or constituent) in a material composite.

> IFC4 CHANGE  The inverse attribute has been added.
RelatesTo SET [0:1] OF IfcMaterialRelationship FOR RelatingMaterial Reference to a material relationship indicating that this material composite has parts (or constituents).

> IFC4 CHANGE  The inverse attribute has been added.

8.10.3.1.2 Entity inheritance

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

8.10.3.1.3 Definitions applying to General Usage

8.10.3.1.3.1 Property Sets for Objects

PsetName
'Pset_MaterialCombustion'
'Pset_MaterialCommon'
'Pset_MaterialEnergy'
'Pset_MaterialFuel'
'Pset_MaterialHygroscopic'
'Pset_MaterialMechanical'
'Pset_MaterialOptical'
'Pset_MaterialThermal'
'Pset_MaterialWater'

8.10.3.1.4 Formal representations

ENTITY IfcMaterial
 SUBTYPE OF (IfcMaterialDefinition);
	Name : IfcLabel;
	Description : OPTIONAL IfcText;
	Category : OPTIONAL IfcLabel;
 INVERSE
	HasRepresentation : SET [0:1] OF IfcMaterialDefinitionRepresentation FOR RepresentedMaterial;
	IsRelatedWith : SET [0:?] OF IfcMaterialRelationship FOR RelatedMaterials;
	RelatesTo : SET [0:1] OF IfcMaterialRelationship FOR RelatingMaterial;
END_ENTITY;