EXPRESS Definition
EXPRESS-G Diagram
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EXPRESS Definition |
EXPRESS-G Diagram |
No Simple Types defined in this Schema
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
M IfcMaterialPropertySelect
IfcMaterialSelect
No Enumerations defined in this Schema
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
M IfcMaterial
IfcMaterialFinish
IfcMaterialLayer
IfcMaterialLayerSet
IfcMaterialLayerSetUsage
IfcMaterialList
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
M IfcMlsTotalThickness
This schema contains the types and classes which are used to define and manipulate materials and their properties. Materials are defined generically, with references to the usage of materials being made from the relevant classes.
NOTE:
The definitions in this schema were included in the IfcPropertyResource schema in Release 1.5.1.
EXPRESS Definition
Definition from IAI: Allows the selection of the various types of material property representations. IfcSimpleProperty and IfcSimplePropertyWithUnit were provided in previous versions. In Release 2.0 IfcTable was added to this schema to allow the storage of information where there are multiple values that need to be stored against a single attribute. For example, the acoustic absorption coefficients for materials have multiple values depending on the frequency of the incident sound waves. The absorption coefficients for brick could be represented as follows:
Frequency (Hz)
Coefficient
125
0.05
500
0.02
2000
0.05
New Select Type in IFC Release 2.0
EXPRESS Definition
Definition from IAI: Selection of whether a material, a material layer, a material layer set or a material list is used.
This Select Type has changed after IFC Release 1.5.1, please see the Migration Guide for details
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EXPRESS Definition |
Definition from IAI: A homogenous substance that can be used to form elements.
This Class has changed after IFC Release 1.5.1, please see the Migration Guide for details
ISSUE: See Issue I342 for IFC Release 1.5.1
This Class does not have any Superclasses or Subclasses
Attribute type (OPT, DER, INV)
Redefinition (SELF)
Attribute / Relation
Data or Rel. type
Definition
MaterialName
STRING
Name of the material.
OPT
MaterialClassification
The material classifications identifying the type of material.
MaterialFinishes
SET [0:?] OF IfcMaterialFinish
Finishes that are appropriate for this material. These finishes can be obtained by direct treatment of the surface of the material. This does NOT store information on applied finishes, such as paints, etc
Properties
SET [0:?] OF IfcMaterialPropertySelect
The list of material properties defined for this material.
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EXPRESS Definition |
Definition from IAI: The properties of a type of finish that can be applied to the material itself (as distinct from an applied finish such as paint).
NOTE: New in IFC Release 2.0
New Class in IFC Release 2.0
This Class does not have any Superclasses or Subclasses
Attribute type (OPT, DER, INV)
Redefinition (SELF)
Attribute / Relation
Data or Rel. type
Definition
FinishName
STRING
Name of the finish treatment
Properties
LIST [0:?] OF IfcMaterialPropertySelect
List of the surface properties that result from the use of this finish on the material.
INV
ForMaterial
Reference to the material to which this finish is applied. Note: each Material/Finish combination will have unique attributes
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EXPRESS Definition |
Definition from IAI: A single and identifiable part constructed from a single material of an element which is constructed from a number of layers. For example, a cavity wall with brick masonry used in each leaf would be modeled using three IfcMaterialLayers.
This Class has changed after IFC Release 1.5.1, please see the Migration Guide for details
ISSUE: Issue I327 for IFC Release 1.5.1
This Class does not have any Superclasses or Subclasses
Attribute type (OPT, DER, INV)
Redefinition (SELF)
Attribute / Relation
Data or Rel. type
Definition
Material
Material from which the material layer is constructed.
OffsetFromMLSBase
The dimensional offset from the datum point of the material layer.
LayerThickness
The thickness of this layer.
INV
ToMaterialLayerSet
Reference to the material layer set, in which the material layer is included.
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EXPRESS Definition |
Definition from IAI: A designation by which an element which is constructed from a number of material layers is known and through which the relative positioning of individual layers can be expressed. An cavity brick wall would be modeled as IfcMaterialLayerSet consisting of three IfcMaterialLayers – brick, air cavity and brick.
This Class has changed after IFC Release 1.5.1, please see the Migration Guide for details
This Class does not have any Superclasses or Subclasses
Attribute type (OPT, DER, INV)
Redefinition (SELF)
Attribute / Relation
Data or Rel. type
Definition
HasMaterialLayers
LIST [1:?] OF IfcMaterialLayer
Identification of the layers from which the material layer set is composed.
IsVentilated
BOOLEAN
Set to TRUE if there is air exchange from the cavity to the outside air.
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EXPRESS Definition |
Definition from IAI: Determines the usage of the material layer set in terms of its offset positioning relative to some baseline and the sense in which the material layers are measured. A cavity brick wall defined as an IfcMaterialLayerSet could be offset from a grid line by 100 mm.
This Class has changed after IFC Release 1.5.1, please see the Migration Guide for details
ISSUE: See Issue I-327 for IFC Release 1.5.1
This Class does not have any Superclasses or Subclasses
Attribute type (OPT, DER, INV)
Redefinition (SELF)
Attribute / Relation
Data or Rel. type
Definition
ForLayerSet
Layer set to which the usage is applied.
MlsOffsetFromBaseline
Offset from some baseline of the layer set. NOTE: By default, the sense of measurement is left to right and this takes the value TRUE.
MlsSenseLtoR
BOOLEAN
The sense in which the layer set is measured.
DER
TotalThickness
Total thickness of the material layer set is derived from the function IfcMlsTotalThickness
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EXPRESS Definition |
Definition from IAI: A list of materials that are used in a non-homogenous element.
This will normally be used where an element is described at a more abstract level. For example, for in an architectural specification writer, the only information that may be needed about a concrete column is that it contains concrete, reinforcing steel and mild steel ligatures.
This Class has changed after IFC Release 1.5.1, please see the Migration Guide for details
This Class does not have any Superclasses or Subclasses
Attribute type (OPT, DER, INV)
Redefinition (SELF)
Attribute / Relation
Data or Rel. type
Definition
Materials
LIST [1:?] OF IfcMaterial
Materials used in a composition of substances.
EXPRESS Definition
Definition from IAI: Calculates the total thickness of a material layer set from the thicknesses of the material layers and their offset from the layer set base.
