The following Nastran cards can be converted to LS-DYNA:
PSHELL
Convert PSHELL into *Section_Shell
A *Part card will be associated to the pshell component.
| • | A new LS-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 LS-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
Altair 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 LS-DYNA values Itt Iss and Irr. |
Convert PBARL (ROD, TUBE, BAR types) into *Section_Beam
Altair 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
Altair 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 LS-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. |
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Convert PBEAML into *Section_Beam
The conversion ignores the case of tapered Nastran beam with intermediate cross section.
| • | Altair 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. |
