The targets of the read and write functions are:
• | Import NASTRAN mesh to create a RADIOSS crash model. |
• | Import NASTRAN model to create a NASTRAN model mainly for: |
o | Static analysis |
o | NVH analysis |
HyperCrash reads only the NASTRAN bulk format.
The Nastran control cards are just able to read and write without any modification possibilities. These lines are kept in the M00 file.
The Nastran bulk data reading will start from the keyword line:
BEGIN BULK
The lines above this keyword line will be set as control cards.
The following table shows the read and write entities by HyperCrash. Most of the NASTRAN entities are translated into a RADIOSS entity.
Currently the following NASTRAN cards are supported:
black : development finish
orange : under development
red : development planned
NASTRAN |
RADIOSS |
NASTRAN |
Notes |
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GRID GRID* |
NODE |
GRID GRID* |
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CQUAD4 CQUAD4* |
SHELL |
CQUAD4 |
ID of CORD is lost |
CTRIA CTRIA* |
SH3N |
CTRIA |
ID of CORD is lost |
CELAS1 |
SPRING |
CELAS1 |
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CBEAM |
BEAM |
CBEAM or CBAR |
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CBAR |
BEAM |
CBEAM or CBAR |
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CROD |
TRUSS |
CROD |
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RBE2 |
RBODY |
RBE2 |
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PSHELL |
PROP/SHELL |
PSHELL |
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PBEAM |
PROP/BEAM |
PBEAM or PBAR |
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PBAR |
PROP/BEAM |
PBEAM or PBAR |
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PELAS |
PROP/13 or PROP/8 |
PELAS |
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CELAS2 |
SPRING type 13 |
CELAS2 |
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MAT1 |
MAT law 1 |
MAT1 |
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PCOMP |
MAT + PROP |
MAT1 + PSHELL |
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FORCE |
CLOAD |
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SPC SPC1 |
BCS |
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CHEXA |
BRICK SHELL16 BRIC20 |
CHEXA |
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CPENTA |
BRICK SHELL16 BRIC20 |
CPENTA |
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PSOLID |
PROP 14 |
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CONM2 |
ADMAS |
CONM2 |
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CTETRA |
TETRA4 TETRA10 |
CTETRA |
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ASET |
GROUP |
ASET |
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RBE3 |
--- |
RBE3 |
Displayed as RBODY |
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KEPT but impossible to modify |
Save as text in the M00 file |
The spotwelds of the RADIOSS model are translated with the following FEM NASTRAN model:
• | CBEAM + RBE2 |
• | CBAR + RBE2 |
• | CWELD |
The spotweld information is written in the <root_name>M00 file.
HyperCrash can translate the previous FEM NASTRAN model to Altair’s spotweld if a <root_name>M00 file can be read during the import of the NASTRAN file.
The following keyword line of the end of the file defines the end of the bulk data.
ENDDATA