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Cooling rate - usdfld

Cooling rate - usdfld

Cooling rate - usdfld

(OP)
Hi! I am modeling phase transformation with Abaqud during steel quenching. I have question about USDFLD. In my USDFLD I have manage to apply several fields to my model. I want to apply heating and cooling rate as USDFLD.

When I call GETVRM I calculate temperature difference as dT=FIELD-STATEV and store dT as field for each step, but i don't know if the DTIME is time increment in this step or should I use DTIME as STATEV, so previous step.

Part of my code where I calculate the cooling rate is:

       SUBROUTINE USDFLD(FIELD,STATEV,PNEWDT,DIRECT,T,CELENT,
     1 TIME,DTIME,CMNAME,ORNAME,NFIELD,NSTATV,NOEL,NPT,LAYER,
     2 KSPT,KSTEP,KINC,NDI,NSHR,COORD,JMAC,JMATYP,MATLAYO,LACCFLA)
C
      INCLUDE 'ABA_PARAM.INC'
C
      CHARACTER*80 CMNAME,ORNAME
      CHARACTER*3  FLGRAY(15)
      DIMENSION FIELD(NFIELD),STATEV(NSTATV),DIRECT(3,3),
     1 T(3,3),TIME(2)
      DIMENSION ARRAY(15),JARRAY(15),JMAC(*),JMATYP(*),COORD(*)         
C
      CALL GETVRM('TEMP',ARRAY,JARRAY,FLGRAY,JRCD,JMAC,JMATYP,
     1 MATLAYO,LACCFLA)
C
      TEMP=ARRAY(1)
      FIELD(1)=ARRAY(1) !temp as field variable
C
      CALL GETVRM('SDV',ARRAY,JARRAY,FLGRAY,JRCD,JMAC,JMATYP,
     1 MATLAYO,LACCFLA)
C
      DTEMP=FIELD(1)-STATEV(1)  !dT
      FIELD(2)=DTIME            !dt
C    
      FIELD(3)=DTEMP/FIELD(2)  
C
      STATEV(1)=FIELD(1)                        
      STATEV(2)=FIELD(2)        
      STATEV(3)=FIELD(3)
      RETURN
      END  

Thanks for comment.  

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