Integrated application resource: Finite element analysis definition relationships ISO 10303-107:2006(E)
© ISO

Cover page
Table of contents
Copyright
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and abbreviations
4 Product and model relationships
   4.1 Introduction
   4.2 Fundamental concepts and assumptions
   4.3 Product and model relationships type definitions
   4.4 Product and model relationships entity definition

5 Action and model relationships
   5.1 Introduction
   5.2 Fundamental concepts and assumptions
   5.3 Action and model relationships type definitions
   5.4 Action and model relationships entity definitions
6 State and model relationships
   6.1 Introduction
   6.2 Fundamental concepts and assumptions
   6.3 State and model relationships type definitions
   6.4 State and model relationships entity definitions

7 Property distribution and model relationships
   7.1 Introduction
   7.2 Fundamental concepts and assumptions
   7.3 Property distribution and model relationships type definitions
   7.4 Property distribution and model relationships entity definitions
8 Fea definition relationships
   8.1 Introduction
   8.2 Fundamental concepts and assumptions
   8.3 Fea definition relationships entity definitions
A Short names of entities
B Information object registration
C Computer interpretable listings
D EXPRESS-G diagrams
Index

8 Fea definition relationships schema

The following Express declaration begins the fea_definition_relationships_schema and identifies the necessary external references.

EXPRESS specification:

*)
SCHEMA fea_definition_relationships_schema;

REFERENCE FROM product_property_definition_schema    --  ISO 10303-41
  (general_property,
   property_definition);

REFERENCE FROM structural_response_representation_schema    --  ISO 10303-104
  (analysis_item_within_representation,
   consistent_element_reference,
   curve_element_section_definition,
   element_aspect,
   element_representation,
   fea_model,
   node_representation,
   surface_section,
   surface_section_field);

REFERENCE FROM support_resource_schema    --  ISO 10303-41
  (identifier,
   label,
   text);

REFERENCE FROM topology_schema;    --  ISO 10303-42
(*

NOTE 1   The schemas referenced above are specified in the following part of ISO 10303:

product_property_definition_schema ISO 10303-41
structural_response_representation_schema ISO 10303-104
support_resource_schema ISO 10303-41
topology_schema ISO 10303-42

NOTE 2   See Annex D for a graphical representation of this schema.

8.1 Introduction

The fea_definition_relationships_schema specifies relationships between the definitions of a beam or shell section property and the idealisations of these definitions for finite element analysis.

The fea_definition_relationships_schema also specifies the relationships between:

and a corresponding finite element model, single finite element, or node.

8.2 Fundamental concepts and assumptions

A finite element analysis is based upon an idealisation of an activity, state, property distribution, or shell or beam section. A single activity, state, property distribution, or shell or beam section can have many different idealisations that are used in, or created by, many different finite element analyses.

NOTE    This schema provides links between the definitions of concepts contained in ISO 10303-41, and the FEA idealisations of them contained in ISO 10303-104.

8.3 fea_definition_relationships_schema entity definition

8.3.1 element_topological_relationship   EXPRESS-G

An element_topological_relationship is a relationship between: which indicates that the element_representation has the topological relationships of the topological_representation_item.

EXPRESS specification:

*)
ENTITY element_topological_relationship;
  aspect : element_aspect;
  element_ref : element_representation;
  item : analysis_item_within_representation;
WHERE
  WR1: 'TOPOLOGY_SCHEMA.TOPOLOGICAL_REPRESENTATION_ITEM' IN TYPEOF (item.item);
  WR2: consistent_topological_reference (aspect, item.item);
  WR3: consistent_element_reference (aspect, element_ref);
END_ENTITY;
(*

Attribute definitions:

aspect: the edge, face or volume of an element

element_ref: the element_representation that is related to the topology.

item: the analysis_item_within_representation that indicates the topological_representation_item to which the element is related.

Formal propositions:

WR1: the topological_representation_item shall be referenced.

WR2: the element aspect shall be related to an appropriate topological representation item. Hence element edges shall be related to an edge, and element faces to a face.

WR3: the element aspect shall be appropriate to the type of element.

8.3.2 fea_beam_section_idealisation_relationship   EXPRESS-G

An fea_beam_section_idealisation_relationship is a relationship between: which indicates that the curve_element_section_definition is an idealisation of the general_property for the purpose of analysis.

NOTE    An Application Protocol or Application Module can recognise that a curve_element_section_definition is also a general_property by creating a subtype of both entities.

EXPRESS specification:

*)
ENTITY fea_beam_section_idealisation_relationship;
  id : identifier;
  name : label;
  description : OPTIONAL text;
  idealised : general_property;
  idealising : curve_element_section_definition;
END_ENTITY;
(*

Attribute definitions:

id: the identifier for the fea_beam_section_idealisation_relationship.

name: the words by which the fea_beam_section_idealisation_relationship is known.

description: the text that provides further information about the fea_beam_section_idealisation_relationship. The value of this attribute need not be specified.

idealised: the general_property that is idealised by the idealising.

idealising: the curve_element_section_definition that idealises the idealised.

8.3.3 fea_model_topological_relationship   EXPRESS-G

An fea_model_topological_relationship is a relationship between: which indicates that the fea_model has the topological relationships of the mesh.

EXPRESS specification:

*)
ENTITY fea_model_topological_relationship;
  item : analysis_item_within_representation;
  model_ref : fea_model;
WHERE
  WR1: 'TOPOLOGICAL_DEFINITION_AND_MESH_SCHEMA.MESH' IN TYPEOF (item.item);
END_ENTITY;
(*

Attribute definitions:

item: the analysis_item_within_representation that indicates the mesh to which the model is related.

model_ref: the fea_model that is related to the mesh.

Formal propositions:

WR1: the mesh shall be referenced.

8.3.4 fea_shell_section_distribution_idealisation_relationship   EXPRESS-G

An fea_shell_section_distribution_idealisation_relationship is a relationship between: which indicates that the surface_section_field is an idealisation of the property_definition for the purpose of analysis.

NOTE    An Application Protocol or Application Module can recognise that a surface_section_field is also a property_definition by creating a subtype of both entities.

EXPRESS specification:

*)
ENTITY fea_shell_section_distribution_idealisation_relationship;
  id : identifier;
  name : label;
  description : OPTIONAL text;
  idealised : property_definition;
  idealising : surface_section_field;
END_ENTITY;
(*

Attribute definitions:

id: the identifier for the fea_shell_section_distribution_idealisation_relationship.

name: the words by which the fea_shell_section_distribution_idealisation_relationship is known.

description: the text that provides further information about the fea_shell_section_distribution_idealisation_relationship. The value of this attribute need not be specified.

idealised: the property_definition that is idealised by the idealising.

idealising: the surface_section_field that idealises the idealised.

8.3.5 fea_shell_section_idealisation_relationship   EXPRESS-G

An fea_shell_section_idealisation_relationship is a relationship between: which indicates that the surface_section is an idealisation of the general_property for the purpose of analysis.

NOTE    An Application Protocol or Application Module can recognise that a surface_section is also a general_property by creating a subtype of both entities.

EXPRESS specification:

*)
ENTITY fea_shell_section_idealisation_relationship;
  id : identifier;
  name : label;
  description : OPTIONAL text;
  idealised : general_property;
  idealising : surface_section;
END_ENTITY;
(*

Attribute definitions:

id: the identifier for the fea_shell_section_idealisation_relationship.

name: the words by which the fea_shell_section_idealisation_relationship is known.

description: the text that provides further information about the fea_shell_section_idealisation_relationship. The value of this attribute need not be specified.

idealised: the general_property that is idealised by the idealising.

idealising: the surface_section that idealises the idealised.

8.3.6 node_topological_relationship   EXPRESS-G

A node_topological_relationship is a relationship between: which indicates that the node_representation has the topological relationships of the vertex.

EXPRESS specification:

*)
ENTITY node_topological_relationship;
  item : analysis_item_within_representation;
  node_ref : node_representation;
WHERE
  WR1: 'TOPOLOGY_SCHEMA.VERTEX' IN TYPEOF (item.item);
END_ENTITY;
(*

Attribute definitions:

item: the analysis_item_within_representation that indicates the vertex to which the node is related.

node_ref: the node_representation that is related to the topology.

Formal propositions:

WR1: the vertex shall be referenced.



*)
END_SCHEMA;  -- fea_definition_relationships_schema
(*


© ISO 2006 — All rights reserved