Properly define a material for use wtih Helius PFA.
If Helius PFA is used to provide the constitutive relations for a particular composite or cohesive material, then Abaqus/Standard considers it to be a user-defined material. Consequently, Abaqus/Standard requires the following three keyword statements for each user-defined material:
A detailed description of each of these keywords and their functionality in Abaqus/Standard can be found in the Abaqus Keywords Reference Manual; however, their use in defining materials for Helius PFA is briefly described below.
The *MATERIAL keyword statement is used to identify the name of the composite or cohesive material. When defining a composite material the name must precisely match the name of a composite material that is stored in the Helius PFA composite material database. For more information on how to create a material file that can be added to the composite material database, please refer to the Composite Material Manager User's Guide.
The *USER MATERIAL keyword statement identifies the material as a user-defined material. The data and options of the *USER MATERIAL keyword statement are used by Helius PFA to identify the specific type of multiscale constitutive relations that should be used for the material.
The *DEPVAR statement is used to request storage space within Abaqus/Standard for the MCT state variables that must be tracked at each integration point in the model.
The specific data and options of the *MATERIAL, *USER MATERIAL, and *DEPVAR keyword statements (along with their formatting requirements) are discussed later (Use Abaqus/CAE to Create Input Files and Use Text Editor to Convert Abaqus Input Files). For now, it suffices that you are aware these three keyword statements will be used collectively to identify each of the composite materials that will be processed by Helius PFA and to identify the specific form of the multiscale constitutive relations that will be used.