Property symmetry Application Object

A Property_symmetry is an Independent_property that indicates a symmetry of an Independent_property_definition with respect to orientation.

A Property_symmetry is a Class that has instances of Independent_property_definition as members and that indicates a symmetry of an Independent_property_definition with respect to orientation.

A Property_symmetry applied to a Range_property_definition applies to each Point_property_definition within the range.

A Property_symmetry is valid only for instances of Independent_property_definition that are second or fourth order tensors.

The instances of Property_symmetry specified by this part of ISO 10303 are shown in Table 1.

Table 1: Standard instances of Property_symmetry

code	name	definition
PS001	anisotropic_symmetric_tensor2_2d	symmetric second order tensor in two dimensions with 3 independent values - see ISO 10303-104:2000
PS002	isotropic_symmetric_tensor2_2d	symmetric second order tensor in two dimensions with 1 independent value - see ISO 10303-104:2000
PS003	anisotropic_symmetric_tensor2_3d	symmetric second order tensor in three dimensions with 6 independent values - see ISO 10303-104:2000
PS004	isotropic_symmetric_tensor2_3d	symmetric second order tensor in three dimensions with 1 independent value - see ISO 10303-104:2000
PS005	orthotropic_symmetric_tensor2_3d	symmetric second order tensor in three dimensions with 3 independent values - see ISO 10303-104:2000
PS006	anisotropic_symmetric_tensor4_2d	symmetric fourth order tensor in two dimensions with 6 independent values - see ISO 10303-104:2000
PS007	isotropic_symmetric_tensor4_2d	symmetric fourth order tensor in two dimensions with 2 independent values - see ISO 10303-104:2000
PS008	isotropic_symmetric_tensor4_3d	symmetric fourth order tensor in three dimensions with 2 independent values - see ISO 10303-104:2000
PS009	iso_orthotropic_symmetric_tensor4_3d	symmetric fourth order tensor in three dimensions with 3 independent values - see ISO 10303-104:2000
PS010	transverse_isotropic_symmetric_tensor4_3d	symmetric fourth order tensor in three dimensions with 5 independent values - see ISO 10303-104:2000
PS011	orthotropic_symmetric_tensor4_3d	symmetric fourth order tensor in three dimensions with 9 independent values - see ISO 10303-104:2000
PS012	monoclinic_symmetric_tensor4_3d	symmetric fourth order tensor in three dimensions with 13 independent values - see ISO 10303-104:2000
PS013	anisotropic_symmetric_tensor4_3d	symmetric fourth order tensor in three dimensions with 21 independent values - see ISO 10303-104:2000

These standard instances of class are identified using the methodology of IEC 61360, where:

the code is as specified in Table 1;
the supplier is this part of ISO 10303.

EXPRESS specification:

*)
ENTITY Property_symmetry
  SUBTYPE OF (
  Class
  Independent_property);
  code :  STRING;
  supplier :  STRING;
UNIQUE
  single_instance_of_class :  code, supplier; 
WHERE
  valid_standard_class :
   IF (supplier = 'ISO/PDTS 10303-1036') THEN
        code IN ['PS001', 'PS002', 'PS003', 'PS004', 'PS005', 'PS006',
        'PS007', 'PS008', 'PS009', 'PS010', 'PS011', 'PS012', 'PS013'];
    ELSE
      TRUE;
    END_IF;
END_ENTITY;
(*

Attribute definitions:

code: the text string that identifies the Property_symmetry.

supplier: the text string that identifies the supplier of theProperty_symmetry.

Formal proposition:

single_instance_of_class: There shall not be more than one instance of Property_symmetry with the same meaning.

valid_standard_class: If the supplier is 'ISO/PDTS 10303-1036', then the code shall be one those listed in Table 1.