User Subroutines

FrontISTR provides interfaces that allow users to extend its functionality through programming. These interfaces are basically FORTRAN subroutines that include a subroutine header, descriptions of input/output variables, and declaration statements for those variables. The main body of the routine must be written by the user.

FrontISTR provides the following user-subroutine interfaces.

Input of User-Defined Materials

When user-defined materials are used, up to 100 user-defined material constants are available. Material constants can be entered in the control data file as shown below, with up to 10 numerical values per line and up to 10 lines.

2nd line through a maximum of the 10th line

v1, v2, v3, v4, v5, v6, v7, v8, v9, v10