Identification and Definition of Helius PFA Materials

Properly define a material for use with Helius PFA.

If Helius PFA is used to provide the constitutive relations for a particular composite or cohesive material, MSC Nastran considers it to be a user-defined material. Consequently, MSC Nastran requires the following entries for a user-defined material:

  1. CONNECT SERVICE
  2. GENUDS
  3. MATUSR (or MCOHE for cohesive materials)
  4. MATUDS

A detailed description of each of these entries and their functionality in MSC Nastran can be found in the MSC Nastran Quick Reference Guide, however, their use in defining materials for Helius PFA is briefly described below.

  1. The CONNECT SERVICE entry defines the Simulation Component Architecture User Defined Service.

  2. The GENUDS entry defines the data passed to the user defined service.

  3. The MATUSR (or MCOHE) entry specifies the user-defined material model for SOL 400.

  4. The MATUDS entry allows you to provide the material routine for use with SOL 400 and the user material constants that govern your model.

Specific requirements for these entries are discussed later (Use a Text Editor to Convert Bulk Data Files). For now it suffices that you are aware these entries collectively identify composite materials processed by Helius PFA and identify the specific form of multiscale constitutive relations that will be used.

Parent topic: General Requirements for MSC Nastran Bulk Data Files