Engine Subroutine FnnLAW for Solid Elements

This subroutine calculates the criteria of failure model.

Use the float external function FINTER (shown below) to get the value Y of the function for the abscissa X:
Y=FINTER(IFUNC(I),X,NPF,TF,DYDX)
Variable
Description
Y
Interpolated value
X
Abscissa value of the function
I
The ith user’s function
DYDX
Slope
NPF, TF
Private function parameters

Arguments

The arguments list of FnnLAW is:
C----------------------------------------------------------------------------  
                           SUBROUTINE FnnLAW (
     1        NEL         ,NUPARAM    ,NUVAR           ,NFUNC          ,IFUNC          ,
     2        NPF          ,TF                   ,TIME               ,TIMESTEP     ,UPARAM     ,
     3        NGL         ,NOT_USE_I1 ,NOT_USE_I2 ,NOT_USE_I3 ,NOT_USE_I4,
     4        EPSPXX  ,EPSPYY         ,EPSPZZ           ,EPSPXY        ,EPSPYZ      ,EPSPZX ,
     5        EPSXX    ,EPSYY           ,EPSZZ              ,EPSXY          ,EPSYZ        ,EPSZX   ,
     6        SIGNXX  ,SIGNYY        ,SIGNZZ           ,SIGNXY        ,SIGNYZ      ,SIGNZX ,
     7        PLA          ,DPLA            ,EPSP                ,UVAR            ,OFF     ,
     8        DELTAX, VOLN, UELR, NOT_USED4 ,NOT_USED5 ) 
C----------------------------------------------------------------------------

Definition

Argument Format Description
NEL Integer read only scalar Number of elements per group. In the Engine subroutine, the element data are treated by groups for vectorization purposes.
NUPARAM Integer read only scalar Size of user parameter array.
NUVAR Integer read only scalar Number of user integration point element variables.
NFUNC Integer read only scalar Number of functions used for failure model materials.
IFUNC Integer array read only Array of size NFUNC containing function indexes.
NPF Integer array private data Array used by FINTER (float external functions).
TF Float array private data Array used by FINTER (float external functions).
TIME Float read only Current time.
TIMESTEP Float read only Current time step.
UPARAM Float array read only User failure parameter array of size NUPARAM.
NGL Integer array read only Array of size NEL containing the external element number.
EPSPXX, EPSPYY, EPSPZZ, EPSPXY, EPSPYZ, ESPPZX Float array read only Array of size NEL containing strain rates in directions XX, YY, and ZZ and strain rates in directions XY, YZ, and ZX.
EPSXX, EPSYY, EPSZZ, EPSXY, EPSYZ, EPSZX Float array read only Array of size NEL containing strain in directions XX, YY, and ZZ and strain rates in directions XY, YZ, and ZX.
SIGNXX, SIGNYY, SIGNZZ, SIGNXY, SIGNYZ, SIGNZX Float array read write Array of size NEL containing stress in directions XX, YY, ZZ, XY, YZ, and ZX.
PLA Float array read only Array of size NEL containing equivalent plastic strain.
DPLA Float array read only Array of size NEL containing incremental equivalent plastic strain.
EPSP Float array read only Array of size NEL, equivalent of strain rate.
UVAR Float array read write Array of size NEL*NUVAR containing integration point element variables.
OFF Float array read write Array of size NEL containing deleted element flags.
0
If the element is OFF
DELTAX Float array read only Array of size NEL containing characteristic element length.
VOLN Float array read only Array of size NEL containing current element volumes.
UELR Float array read write Array of size NEL, containing the number of IP’s in which the failure criteria is satisfied for all elements.
NOT_USE_I1, NOT_USE_I2, NOT_USE_I3, NOT_USE_I4 Integer scalar Not used. Can be used in the future.
NOT_USED4, NOT_USED5 Float scalar Not used. Can be used in future.