The subroutine interfaces presented here are routines that you may call.
Utility routines are supplied to submit errors and perform other common tasks. Most routines are used to access more information about a material, i.e., obtaining the strength values of the material. See Build on Windows for instructions on building the subroutine for use with Helius PFA.
Routines with a plain prefix of HELIUS_ or FEA_ can be called from any user subroutine. Those with a prefix of HELIUS2_ can only be called from user subroutines for unidirectional composites and likewise for woven composites and routines with an HELIUS3_ prefix.