HyperMesh and BatchMesher

NASTRAN to DYNA Conversion Tool

NASTRAN to DYNA Conversion Tool

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NASTRAN to DYNA Conversion Tool

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The following Nastran cards can be converted to LS-DYNA:

PSHELL

PSOLID
PBAR
PBARL
PBEAM
PBEAML

 

Convert PSHELL into *Section_Shell


A *Part card will be associated to the pshell component.

A new DYNA property *section_shell will be created and assigned to the *Part card.
The original material ID will be assigned to the *Part.
The Nastran thickness will be assigned to the T1 *section_shell card.
The Nastran NSM value will be assigned to the MAREA DYNA entry.

 

Convert PSOLID into *Section_Solid


A *Part card will be associated to the component.

A new DYNA property *section_solid will be created and assigned to the corresponding *Part card.
The original material ID will be assigned to the *Part.

 

Convert PBAR into *Section_Beam


HyperMesh will create different components so that the bar elements using a common Nastran property will be moved into a single component.

A *Part card will be associated to this component.
A new LS-DYNA property *section_beam with ELFORM 2 will be created and assigned to the *Part card.
The original material ID will be assigned to the *Part.
The Nastran A field will be mapped to the DYNA AREA entry; the Nastran Inertia I1 I2 and J will be assigned to the corresponding DYNA values Itt Iss and Irr.

 

Convert PBARL (ROD, TUBE, BAR types) into *Section_Beam


HyperMesh will create different components so that the bar elements using a common Nastran property will be moved into a single component.

A *Part card will be associated to this component.
A new LS-DYNA property *section_beam with ELFORM 1 will be created and assigned to the *Part card.
The original material ID will be assigned to the *Part.
The nonstructural mass, NSM, will be converted between the solvers.
For the Pbarl-ROD type, the Nastran entry, DIM1, will be moved to the LS-DYNA Ts1 and Ts2.  In the *section_beam card, the CST entry will be set to value 1.
For the Pbarl-TUBE type, the Nastran entry DIM1 will be moved to the LS-DYNA Ts1 and Ts2, DIM2 will be assigned to the LS-DYNA entries TT1 and TT2.  In the *section_beam card, the CST entry will be set to the value 1.
For the Pbarl-BAR type only, the Nastran entry DIM1 will be moved to the LS-DYNA Ts1 and Ts2.  In the *section_beam card, the CST entry will be set to value 0.

 

Convert PBEAM into *Section_Beam


HyperMesh will create different components so that the beam elements using a common Nastran property will be moved into a single component.

A *Part card will be associated to this component.
A new LS-DYNA property *section_beam with ELFORM 2 will be created and assigned to the *Part card.
The original material ID will be assigned to the *Part.
The Nastran A field will be mapped to the LS-DYNA AREA entry; the Nastran Inertia I1 I2 and J will be assigned to the corresponding DYNA values Itt Iss and Irr.
Note:LS-DYNA does not provide a field to store the I12 value; if the I12 value is available, the conversion will not occur.

 

Convert PBEAML into *Section_Beam


The conversion ignores the case of tapered Nastran beam with intermediate cross section.

HyperMesh will create different components so that the beam elements using a common Nastran property will be moved into a single component.
A *Part card will be associated to the component.
A new LS-DYNA property *section_beam with ELFORM 1 will be created and assigned to the *Part card.
The original material ID will be assigned to the *Part.
The nonstructural mass NSM will be converted between the solvers.
For the Pbeaml-ROD type, the Nastran entry DIM1(A) will be moved to the LS-DYNA Ts1, the DIM1(B) will be moved into Ts2. In the *Section_Beam card the CST entry will be set to value 1.
For the Pbeaml-TUBE type, the Nastran entry DIM1(A) will be moved to the LS-DYNA Ts1, the DIM1(B) will be moved into Ts2. The Nastran entry DIM2(A) will be moved to the LS-DYNA TT1, the DIM2(B) will be moved into TT2.  In the *section_beam card the CST entry will be set to value 1.
For the Pbeaml-BAR type, the Nastran entry DIM1(A) will be moved to the LS-DYNA TT1 the DIM1(B) will be moved into TT2. The Nastran entry DIM2(A) will be moved to the LS-DYNA TS1, the DIM2(B) will be moved into TS2.  In the *section_beam card the CST entry will be set to value 0.