The Materials form will appear when the Materials toggle, located on the Patran application selections, is chosen. The selections made on this form will determine which Materials form appears and, ultimately, which PAMCRASH material will be created.

Several materials within PAMCRASH differ only by the material ID, even though the material models are identical. The difference in material ID is due to the underlying element dimensionality. e.g. PAMCRASH Materials 1, 102 and 212 are all elastic/plastic material models which share the same input data, however Material Type 1 is applicable only to solids, Type 102 only to shells and Type 212 only to beams. Within Patran, all of these materials are defined as a single material model which may be applied to any of the applicable element types. When the translator is called to produce a PAMCRASH input file, appropriate PAMCRASH material types are created for each element type required.

The following pages give an introduction to the Materials form, and details of all the material property definitions supported by the Patran PAMCRASH 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 PAMCRASH input file, with material data copied from user identified files. This allows a user not only to insert material types that are not supported directly by the PAMCRASH preference, but also to make use of a standard library of materials.

This form appears when Materials is selected on the main form. The Materials form is used to provide options to create the various PAMCRASH materials.

Table 2‑2 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 object on the Material form, and when Linear Elastic is the selected Constitutive Model on the Input Options form.

Use this form to define the data for PAMCRASH Material Types 1, 101 and 201. The parameters required are: Density, Elastic Modulus and Poisson Ratio.

Note that PAMCRASH does not directly support a linear elastic material for solid elements. When this Patran material option is applied to solid elements, a PAMCRASH material Type 1 (Elastic/Plastic) will be written to the PAMCRASH input file, with the tangent modulus equal to the elastic modulus, and the Yield stress set artificially high (equal to the value of the elastic modulus).

The following subordinate forms appear when the Input Properties button is selected on the Materials form when any of the options are selected.

Use the forms on the next pages to define the data for PAMCRASH Material Types 1 (Solid), 102/103/105/106 (Shell), or 202/212 (Rod and Beam). Note that the strain rate dependency model is determined at a global level, by the ISTRAT parameter. Hence the 6 strain rate parameters cannot have names. For the sake of mapping to other codes the first two of those parameters should be the Cowper Symonds D and p parameters. The contents of the form will vary depending upon which option is selected. The parameters which are required are tabulated below.

The following form is typical of Elastoplastic material Input data forms when the Bilinear definition method is selected. Use this form to define the data for PAMCRASH Materials Types 1, 101, and 102.

This subordinate form appears when the Input Properties button is selected on the Materials form when the Viscoelastic Constitutive model is selected. Use this form to define the data for PAMCRASH Material Type 5.

This subordinate form appears when the Input Properties button is selected on the Materials form when the Null Rigid Constitutive model is selected. Use this form to define the data for PAMCRASH Material Types 99, 100 and 200.

This subordinate form appears when the Input Properties button is selected on the Materials form when the Foam constitutive model is selected.Use this form to define the data for PAMCRASH Material Type 2.

This subordinate form appears when Composite is the object on the Material form, and laminate is the selected method. Only PLY Model 0 (Unidirectional composite bi-phase ply model) is supported and only the element local coordinate system is supported for specifying ply orientation.