I-DEAS Universal File Reader

I-DEAS Universal File Reader

The I-DEAS Universal file reader reads and processes the following I-DEAS Universal file modules.

Module Number	Contents	Data Processed
151	Title
755	Restraints	Translational and rotation restraints in the global axis system.
773, 1710 & 1714	Materials	ID and Name
776	Beam Cross Sections	ID and Name ( see below for more details)
780 & 2412	Elements	( see below for more details)
781 & 2411	Nodes	ID, Global Coordinates
789, 2437, 2448	Physical Sections	ID and Name ( see below for more details)

Element Types

I-DEAS TYPE	Colour	Ansys LS-DYNA Type	Additional Data / Comments
21	Any	2 Noded Beam	Beam Orientation Node
91	Any	3 Noded Shell
94	Any	4 Noded Shell
101	Any	6 Noded Thick Shell
104	Any	8 Noded Thick Shell
111	Any	4 Noded Solid
112	Any	6 Noded Solid
115	Any	8 Noded Solid
122	Cyan	*CONSTRAINED_RIVET	Only first 2 nodes processed
122	Red	*CONSTRAINED_SPOTWELD	Only first 2 nodes processed
122	Yellow	*CONSTRAINED_NODAL_ RIGID_BODY	I-DEAS element ID is used as the Ansys LS-DYNA node set ID.
122	Green	*CONSTRAINED_NODE_SET	I-DEAS element ID is used as the Ansys LS-DYNA node set ID
122	Blue	*CONSTRAINED_GENERALIZED_ WELD_SPOT	I-DEAS element ID is used as the Ansys LS-DYNA node set ID
136	Any	Translational Spring
137	Any	Rotational Spring
138	Any	Grounded Translational Spring
139	Any	Grounded Rotational Spring
141	Any	Translational Damper
161	Any	Lumped Mass

Physical Sections

IDEAS TYPE	Ansys LS-DYNA Type	Ansys LS-DYNA Data Processed
90 (Thin Shell)	*SECTION_SHELL	ID, Name, Shell thickness
100 (Thick Shell)	*SECTION_TSHELL	ID, Name
110 (Solid)	*SECTION_SOLID	ID, Name
133 (Translational Spring)	*SECTION_DISCRETE	ID, Name
134 (Rotational Spring)	*SECTION_DISCRETE	ID, Name
161 (Lumped Mass)	*ELEMENT_MASS	Mass

Beam Cross Sections

I-DEAS TYPE	Ansys LS-DYNA Type	Ansys LS-DYNA Data Processed
0 (Keyed In)	Belytschko-Schwer	Area, Iss, Itt, Irr , Shear Area = Area
1 (Rectangular)	Hughes-Lui (Rectangular)	TS1, TS2, TT1, TT2
3 (Circular)	Hughes-Lui (Circular)	TS1, TS2, TT1, TT2
4 (Pipe)	Hughes-Lui (Circular)	TS1, TS2, TT1, TT2
999 (General)	Belytschko-Schwer	Area, Iss, Itt, Irr, Shear Area = Area

In I-DEAS an elements properties are defined by both a set of Material data and a set of Physical. In Ansys LS-DYNA an elements properties are defined by a single PART number which then references a Material and a Section. When importing a Universal file PRIMER will automatically generate PARTS for all the combinations of Materials and Physicals used in the universal file. The ID's assigned to each PART can be made equal to either the elements Material ID or the elements Physical (Section) ID.

If PART numbers are based on Material ID and a Material is used with more than one Physical (Section) then the numbering scheme described above can not be followed. If this is the case then the PART using the Material which has the lowest Physical (Section) ID will be assigned the and ID equal to the Material ID and any other PARTs using the same material will be given ID's greater then the highest PART ID. Similarly if PART numbers are based on Physical (Section) ID and a Section is used with more than one Material then unique PART numbers will be generated for each PART.

The following table shows the difference in basing the PART number on the material or section property ID. Note that as there is only a clash with the material numbers then the option of basing the PART number on the section ID still results in the PARTS being given ID's the same as the section properties.

SPRING ELEMENTS

In I-DEAS spring elements are only assigned a Physical (Section) ID. PRIMER assumes that the Material ID of a spring element is the same as the Physical (Section) ID. Spring elements should NOT therefore be defined using Physical (Section) ID's that are the same as Material ID's used by other element types.

BEAM ELEMENTS

In I-DEAS the section properties for beam elements are defined using a Beam Cross Section. This means it is possible for beams to have the same Material and Physical ID's but to have different Beam Sections. When translating beam elements for I-DEAS PRIMER ignores the Physical ID and uses the Beam Cross Section ID as the Ansys LS-DYNA section ID. Beam Cross Sections should NOT therefore be defined using the same ID's as Physical Sections used by element types that are not beams.