The Materials form will appear when the Material toggle, located on the Patran application selections, is chosen. The selections made on the Materials menu will determine which material form appears, and ultimately, which LS-DYNA material will be created.

The following pages give an introduction to the Materials form, and details of all the material property definitions supported by the Patran LS-DYNA preference.

Only material records which are referenced by an element property region or by a laminate lay-up will be translated. References to externally defined materials will result in special comments in the LS-DYNA input file, with material data copied from user identified files. This reference allows a user not only to insert material types that are not supported directly by the LS-DYNA preference, but also to make use of a standard library of materials.

This form appears when Materials is selected on the main menu. The Materials form is used to provide options to create the various LS-DYNA materials.

The following table outlines the options when Create is the selected Action.

This subordinate form appears when the Input Properties button is selected on the Materials form when Isotropic is the selected Object, and when Linear Elastic is the selected Constitutive Model on the Input Options form.

Use this form to define the data for LS-DYNA Material Type 1 (*MAT_ELASTIC). If the “Material” is set as “Fluid” the parameters required are: Density, Bulk Modulus, Viscosity Coefficient, and
Cavitation Pressure.

This subordinate form appears when the Input Properties button is selected on the Materials form, when Isotropic is the selected object, Elastoplastic is the selected Constitutive Model, and the following is the selected Implementation.

Use this form to define the data for LS-DYNA Material Type 3 (*MAT_PLASTIC_KINEMATIC).

This subordinate form appears when the Input Properties button is selected on the Materials form, when Isotropic is the selected object, Elastoplastic is the selected Constitutive Model, and the following is the selected Implementation.

Use this form to define the data for LS-DYNA Material Type 12 (*MAT_ISOTROPIC_ELASTIC_PLASTIC).

This subordinate form appears when the Input Properties button is selected on the Materials form, when Isotropic is the selected object, Elastoplastic is the selected Constitutive Model, and the following is the selected Implementation.

Use this form to define the data for LS-DYNA Material Type 19 (*MAT_STRAIN_RATE_DEPENDENT_PLASTICITY).

This subordinate form appears when the Input Properties button is selected on the Materials form, when Isotropic is the selected object, and one of the following combinations is selected.

Use the form on the next page to define the data for LS-DYNA Material Type 24 (*MAT_PIECEWISE_LINEAR_PLASTICITY). The contents of the form will vary depending upon which option is selected. If the bilinear option is selected then the tangent modulus is required. The linearized option requires definition of a strain dependent field. If the General rate model is selected instead of the Cowper Symonds model then the Yield Stress is defined as a strain rate dependent field.

This subordinate form appears when the Input Properties button is selected on the Materials form, when Isotropic is the selected object, Elastoplastic is the selected Constitutive Model, and the following is the selected Implementation.

Use this form to define the data for LS-DYNA Material Type 64 (*MAT_RATE_SENSITIVE_POWERLAW_PLASTICITY).

This subordinate form appears when the Input Properties button is selected on the Materials form, when Isotropic is the selected object, Elastoplastic is the selected Constitutive Model, and the following is the selected Implementation.

Use this form to define the data for LS-DYNA Material Type 28 (*MAT_RESULTANT_PLASTICITY).

This subordinate form appears when the Input Properties button is selected on the Materials form, when Isotropic is the selected object, Elastoplastic is the selected Constitutive Model, and the following is the selected Implementation.

Use this form to define the data for LS-DYNA Material Type 30 (*MAT_CLOSED_FORM_SHELL_PLASTICITY).

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, and the Viscoelastic Constitutive model is selected. Use this form to define the data for LS-DYNA Material Type 6 (*MAT_VISCOELASTIC).

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, and the Rigid Constitutive model is selected. Use this form to define the data for LS-DYNA Material Type 20 (*MAT_RIGID).

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, and one of the following combinations is selected.

Use the form on the next page to define the data for LS-DYNA Material Type 15 (*MAT_JOHNSON_COOK). The contents of the form do not vary.

Additional data for this form are: Effective Plastic Strain rate, Specific Heat, Failure Stress/Pressure, and 5 Failure Parameters.

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, Rubber is the selected Constitutive Model, and the following is the selected Implementation.

Use this form to define the data for LS-DYNA Material Type 7 (*MAT_BLATZ-KO_RUBBER).

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, Rubber is the selected Constitutive Model, and the following is the selected Implementation.

Use this form to define the data for LS-DYNA Material Type 27 (*MAT_MOONEY_RIVLIN_RUBBER).

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, Rubber is the selected Constitutive Model, and one of the following combinations is selected.

Use the form on the next page to define the data for LS-DYNA Material Type 31 (*MAT_FRAZER_NASH_RUBBER_MODEL). The contents of the form varies depending on the option selected for defining the material response. If the model is defined as least squares fit then specimen data and a field defining force versus change in gauge length are required instead of the coefficients that appear on the form below. Note that a strain field must be defined, although this is interpreted by the translator as force versus actual change in the gauge length. If the strain limits are to be ignored then maximum and minimum strain limits are not required.

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, Foam is the selected Constitutive Model, and one of the following combinations is selected.

Use the form on the next page to define the data for LS-DYNA Material Type 57 (*MAT_LOW_DENSITY_FOAM). The contents of the form does not vary.

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, Foam is the selected Constitutive Model, and the following is the selected Implementation.

Use this form to define the data for LS-DYNA Material Type 62 (*MAT_VISCOUS_FOAM).

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, Foam is the selected Constitutive Model, and the following is the selected Implementation.

Use this form to define the data for LS-DYNA Material Type 63 (*MAT_CRUSHABLE_FOAM).

This subordinate form appears when the Input Properties button is selected on the Materials form, Isotropic is the selected Object, Foam is the selected Constitutive Model, and one of the following combinations is selected.

Use the form on the next page to define the data for LS-DYNA Material Type 5 (*MAT_SOIL_AND_FOAM) or Material Type 14 (*MAT_SOIL_AND_FOAM_FAILURE). Choice between the Type 5 and Type 14 is solely on the basis of whether failure is permitted when pressure meets the failure pressure.

This subordinate form appears when the Input Properties button is selected on the Materials form, 2D Orthotropic is the Selected Object, and when Laminated Glass is the selected Constitutive Model on the Input Options form. Use this form to define the data for LS-DYNA Material Type 32 (*MAT_LAMINATED_GLASS).

This subordinate form appears when the Input Properties button is selected on the Materials form when 3D Orthotropic is selected on the Material form, and when the Honeycomb Constitutive model is selected. Use this form to define the data for LS-DYNA Material Type 26 (*MAT_HONEYCOMB).

This subordinate form appears when the Input Properties button is selected on the Materials form when 3D Orthotropic is the selected Object, Composite is the Selected Constitutive Model, and the following is the selected Implementation.

Use the subordinate form on the following page to define the data for LS-DYNA Material Type 22 (*MAT_COMPOSITE_DAMAGE).

This subordinate form appears when the Input Properties button is selected on the Materials form, 3D Orthotropic is the selected Object, Composite is the Selected Constitutive Model, and the following is the selected Implementation.

Use the subordinate form on the following page to define the data for LS-DYNA Material Type 58 (*MAT_COMPOSITE_FAILURE_MODEL).