×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Problems using subroutine UHARD

Problems using subroutine UHARD

Problems using subroutine UHARD

(OP)
Hello everyone.

I'm facing a problem with the subroutine UHARD. I want to create a simple power law equation for testing a bigger UMAT subroutine.

The equation I would like to implement is the Ludiwg equation: SIGMA_YIELD = SIGMA_0 + K*EQPLAS^N

Here is a copy of the full subroutine. It is very simple.

      SUBROUTINE UHARD(SYIELD,HARD,EQPLAS,EQPLASRT,TIME,DTIME,TEMP,
     1     DTEMP,NOEL,NPT,LAYER,KSPT,KSTEP,KINC,CMNAME,NSTATV,
     2     STATEV,NUMFIELDV,PREDEF,DPRED,NUMPROPS,PROPS)
C
      INCLUDE 'ABA_PARAM.INC'
C
      CHARACTER*80 CMNAME
      DIMENSION HARD(3),STATEV(NSTATV),TIME(*),
     $          PREDEF(NUMFIELDV),DPRED(*),PROPS(*)
C
C     USES LUDWIG EQUATION: SIGMA_YIELD = SIGMA_0 + K*EQPLAS^N
C                           d(SIGMA)/d(EQPLAS) = K*N*EQPLAS^(N-1)
C     USER INPUT:
C     PROPS(1) = SIGMA_0
C     PROPS(2) = K
C     PROPS(3) = N
C
      PARAMETER(ZERO=0.D0, ONE=1.D0)
C
C     CALCULATE
C
      SYIELD=PROPS(1) + PROPS(2)*EQPLAS**PROPS(3)
      HARD(1)=PROPS(2)*PROPS(3)*EQPLAS**(PROPS(3)-ONE)
      HARD(2)=ZERO
      HARD(3)=ZERO

      RETURN
      END

------------------------------------------------------------

But the job exits with an error:

The executable C:\SIMULIA\Abaqus\6.10-1\exec\standard.exe aborted with system error code 144. Please check the .dat, .msg, and .sta files for error messages if the files exist.

But there is no clue in the .dat, .msg, .sta or .log. I think this is a problem with my coding, but I cannot fix it.

Thank you for your help and sorry for any mistakes. English is not my birth language.

Stergios Pericles Tsiloufas
Escola Politécnica
University of São Paulo
Brazil

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources