8.10.3.1 IfcMaterial
8.10.3.1.1 Semantic definition
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.
entity in IFC4 The attributes Description and Category have been added.8.10.3.1.2 Entity inheritance
8.10.3.1.3 Attributes
| # | Attribute | Type | Description |
|---|---|---|---|
| IfcMaterialDefinition (3) | |||
| 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. The inverse attribute has been added. |
|
| HasExternalReferences | SET [0:?] OF IfcExternalReferenceRelationship FOR RelatedResourceObjects |
Reference to external references, e.g. library, classification, or document information, that are associated to the material. The inverse attribute has been added. |
|
| HasProperties | SET [0:?] OF IfcMaterialProperties FOR Material |
Material properties assigned to instances of subtypes of IfcMaterialDefinition. The inverse attribute has been added. |
|
| Click to show 3 hidden inherited attributes Click to hide 3 inherited attributes | |||
| IfcMaterial (6) | |||
| 1 | Name | IfcLabel |
Name of the material. A view definition may require each Name attribute to be unique, e.g. for each concrete or steel grade used in a project, in which case the Category should take the values 'concrete' or 'steel'. 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. 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. It is recommended to use common terms for the material category, the following list constitutes such a recommondation: 'concrete', 'steel', 'aluminium', 'block', 'brick', 'stone', 'wood', 'glass', 'gypsum', 'plastic', 'earth'. The attribute has been added at the end of attribute list. |
| HasRepresentation | SET [0:1] OF IfcMaterialDefinitionRepresentation FOR RepresentedMaterial |
Reference to the IfcMaterialDefinitionRepresentation that provides presentation information to a representation common to this material in style definitions. 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. 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). The inverse attribute has been added. |
|
8.10.3.1.4 Property sets
-
Pset_MaterialCombustion
- SpecificHeatCapacity
- N20Content
- COContent
- CO2Content
-
Pset_MaterialCommon
- MolecularWeight
- Porosity
- MassDensity
-
Pset_MaterialConcrete
- CompressiveStrength
- MaxAggregateSize
- AdmixturesDescription
- Workability
- WaterImpermeability
- ProtectivePoreRatio
-
Pset_MaterialEnergy
- ViscosityTemperatureDerivative
- MoistureCapacityThermalGradient
- ThermalConductivityTemperatureDerivative
- SpecificHeatTemperatureDerivative
- VisibleRefractionIndex
- SolarRefractionIndex
- GasPressure
-
Pset_MaterialFuel
- CombustionTemperature
- CarbonContent
- LowerHeatingValue
- HigherHeatingValue
-
Pset_MaterialHygroscopic
- UpperVaporResistanceFactor
- LowerVaporResistanceFactor
- IsothermalMoistureCapacity
- VaporPermeability
- MoistureDiffusivity
-
Pset_MaterialMechanical
- DynamicViscosity
- YoungModulus
- ShearModulus
- PoissonRatio
- ThermalExpansionCoefficient
-
Pset_MaterialOptical
- VisibleTransmittance
- SolarTransmittance
- ThermalIrTransmittance
- ThermalIrEmissivityBack
- ThermalIrEmissivityFront
- VisibleReflectanceBack
- VisibleReflectanceFront
- SolarReflectanceBack
- SolarReflectanceFront
-
Pset_MaterialSteel
- YieldStress
- UltimateStress
- UltimateStrain
- HardeningModule
- ProportionalStress
- PlasticStrain
- Relaxations
- StructuralGrade
-
Pset_MaterialThermal
- SpecificHeatCapacity
- BoilingPoint
- FreezingPoint
- ThermalConductivity
-
Pset_MaterialWater
- IsPotable
- Hardness
- AlkalinityConcentration
- AcidityConcentration
- ImpuritiesContent
- DissolvedSolidsContent
- PHLevel
-
Pset_MaterialWood
- Species
- StrengthGrade
- AppearanceGrade
- Layup
- Layers
- Plies
- MoistureContent
- DimensionalChangeCoefficient
- ThicknessSwelling
-
Pset_MaterialWoodBasedStructure
- ApplicableStructuralDesignMethod
-
Pset_MechanicalBeamInPlane
- YoungModulus
- YoungModulusMin
- YoungModulusPerp
- YoungModulusPerpMin
- ShearModulus
- ShearModulusMin
- BendingStrength
- TensileStrength
- TensileStrengthPerp
- CompStrength
- CompStrengthPerp
- RaisedCompStrengthPerp
- ShearStrength
- TorsionalStrength
- ReferenceDepth
- InstabilityFactors
-
Pset_MechanicalBeamInPlaneNegative
- YoungModulus
- YoungModulusMin
- YoungModulusPerp
- YoungModulusPerpMin
- ShearModulus
- ShearModulusMin
- BendingStrength
- TensileStrength
- TensileStrengthPerp
- CompStrength
- CompStrengthPerp
- RaisedCompStrengthPerp
- ShearStrength
- TorsionalStrength
- ReferenceDepth
- InstabilityFactors
-
Pset_MechanicalBeamOutOfPlane
- YoungModulus
- YoungModulusMin
- YoungModulusPerp
- YoungModulusPerpMin
- ShearModulus
- ShearModulusMin
- BendingStrength
- TensileStrength
- TensileStrengthPerp
- CompStrength
- CompStrengthPerp
- RaisedCompStrengthPerp
- ShearStrength
- TorsionalStrength
- ReferenceDepth
- InstabilityFactors
-
Pset_MechanicalPanelInPlane
- YoungModulusBending
- YoungModulusTension
- YoungModulusCompression
- ShearModulus
- BendingStrength
- CompressiveStrength
- TensileStrength
- ShearStrength
- BearingStrength
- RaisedCompressiveStrength
- ReferenceDepth
-
Pset_MechanicalPanelOutOfPlane
- YoungModulusBending
- YoungModulusTension
- YoungModulusCompression
- ShearModulus
- BendingStrength
- CompressiveStrength
- TensileStrength
- ShearStrength
- BearingStrength
- RaisedCompressiveStrength
- ReferenceDepth
-
Pset_MechanicalPanelOutOfPlaneNegative
- YoungModulusBending
- YoungModulusTension
- YoungModulusCompression
- ShearModulus
- BendingStrength
- CompressiveStrength
- TensileStrength
- ShearStrength
- BearingStrength
- RaisedCompressiveStrength
- ReferenceDepth
8.10.3.1.5 Concept usage
8.10.3.1.6 Examples
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Figure 8.10.3.1.A -
Figure 8.10.3.1.B -
Figure 8.10.3.1.C -
Figure 8.10.3.1.D -
Figure 8.10.3.1.E -
Figure 8.10.3.1.F -
Figure 8.10.3.1.G -
Figure 8.10.3.1.H -
Figure 8.10.3.1.I -
Figure 8.10.3.1.J -
Figure 8.10.3.1.K -
Figure 8.10.3.1.L -
Figure 8.10.3.1.M -
Figure 8.10.3.1.N -
Figure 8.10.3.1.O -
Figure 8.10.3.1.P -
Figure 8.10.3.1.Q -
Figure 8.10.3.1.R -
Figure 8.10.3.1.S -
Figure 8.10.3.1.T -
Figure 8.10.3.1.U -
Figure 8.10.3.1.V
8.10.3.1.7 Formal representation
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;