Appendix A - MATPFA Fields

View details of each field in the MATPFA entry.

The table below provides a short description of the feature controlled by each MATPFA field along with the allowable range of values for each field.

FieldConstitutive Issue Controlled by the FieldAllowable Values
MIDMaterial Identification NumberInteger
MIDHHelius PFA Material Identification NumberInteger referencing mdata file
PDIRPrincipal Material Coordinate System

Unidirectional → 1, 2

Woven → 1, 2, 3

FTFailure Theory

Uni → MCT, STRESS, STRAIN, HILL, TSAI, CHRI, HASH, PUCK, LaRC02, USER

Woven → MCT, STRESS, STRAIN, USER

MPSTIF

MDE

Matrix Post Failure Stiffness

Matrix Degradation Energy

0.0 < value ≤ 1.0

value > 0.0

FPSTIF

FDE

Fiber Post Failure Stiffness

Fiber Degradation Energy

0.0 < value ≤ 1.0

value > 0.0

DEVODamage Evolution MethodINSTANT, ENERGY
PRENLPre-Failure NonlinearityOFF, ON
TREFTemperature Flag

-1 (activate temperature dependence)

value ≥ 0.0 (temperature corresponding to environment in mdata file)

MOISTMoisture FlagAMBIENT, DRY, WET

F

ALPHA

Cross-product Term in Tsai-Wu FC

Contribution of Longitudinal Shear Stress for Hashin FC

Real Number

Real Number

SBIAXEquibiaxial Stress at Failure for Tsai-Wu FCReal Number
PFTYPEProgressive Failure Analysis Type

Uni → 0 (off), 1 (on)

Woven → 0 (off), 1 or 2 (on)

HYDROHydrostatic StrengtheningOFF, ON

The remainder of Appendix A discusses each MATPFA field in detail, including the impact of the field on the multiscale constitutive relations used to represent the composite material.