Re: creep subroutine

Dear Dr. Dave,
 
Now its clear to me and i have wrote USDFLD with CREEP and it worked. Thanks you very much for the suggestion.
But if i am not using COMMON block for both the subroutines then it gives error in CREEP subroutine saying
that "variable is used before its value has been defined".
 
Regards,
 
-Goyal

--- On Wed, 5/11/11, Dave Lindeman <ddlindeman <at> mmm.com> wrote:

From: Dave Lindeman <ddlindeman <at> mmm.com>
Subject: Re: [Abaqus] creep subroutine
To: Abaqus <at> yahoogroups.com
Date: Wednesday, May 11, 2011, 7:34 PM

Field variables can be viewed as additional degrees-of-freedom that are 
defined by the user (either directly or through the USDFLD subroutine). 
  They are present during the solution process, so material properties 
can be defined as functions of theses variables.

UVARM is used to calculate and store user-defined results values.  These 
values are written to the output database, and will be available for 
postprocessing, but are not active within the solution process.

If you use field variables, you will not need to use a COMMON block -- 
the field variable values will be passed in to the CREEP subroutine.

Regards,
Dave

Dave Lindeman
Lead Research Specialist
3M Company
3M Center 235-3F-08
St. Paul, MN 55144
651-733-6383

On 5/11/2011 3:21 AM, sunil goyal wrote:
> Thanks for the info...
>
> Exactly what is the difference between UVARM and USDFLD? I mean in both
> the subroutines we store the variables and call the variables in other
> subroutine. Which one is appropriate for me (creep problem)? One more
> thing is that whether i need to wite COMMON statement for variables
> common in both the subroutines ?
>
> Regards,
>
> -Goyal
>
> --- On Mon, 5/9/11, Dave Lindeman <ddlindeman <at> mmm.com
> <mailto:ddlindeman%40mmm.com>> wrote:
>
> From: Dave Lindeman <ddlindeman <at> mmm.com <mailto:ddlindeman%40mmm.com>>
> Subject: Re: [Abaqus] creep subroutine
> To: Abaqus <at> yahoogroups.com <mailto:Abaqus%40yahoogroups.com>
> Date: Monday, May 9, 2011, 10:21 PM
>
> You probably want to use USDFLD in place of UVARM -- i.e., retrieve the
> values of interest using GETVRM within USDFLD, store the values as field
> variables, then retrieve the field variable values within the CREEP
> subroutine.
>
> Regards,
> Dave
>
> Dave Lindeman
> Lead Research Specialist
> 3M Company
> 3M Center 235-3F-08
> St. Paul, MN 55144
> 651-733-6383
>
> On 5/5/2011 8:56 AM, sunil goyal wrote:
>  > The error message is related with creep subroutine. i am not able to
>  > call these value in creep subroutine. i am using UVARM like this...
>  >
>  >        SUBROUTINE UVARM(UVAR,DIRECT,T,TIME,DTIME,CMNAME,ORNAME,
>  >       1 NUVARM,NOEL,NPT,LAYER,KSPT,KSTEP,KINC,NDI,NSHR,COORD,
>  >       2 JMAC,JMATYP,MATLAYO,LACCFLA)
>  >        INCLUDE 'ABA_PARAM.INC'
>  > C
>  >        CHARACTER*80 CMNAME,ORNAME
>  >        CHARACTER*3 FLGRAY(15)
>  >        DIMENSION UVAR(NUVARM),DIRECT(3,3),T(3,3),TIME(2)
>  >        DIMENSION ARRAY(15),JARRAY(15),JMAC(*),JMATYP(*),COORD(*)
>  >
>  >   call GETVRM('SINV',-----)
>  > > MISES=ARRAY(1)
>  > > call GETVRM('SP',-----)
>  > > SP3=ARRAY(1)
>  >   and then i am using these (MISES and SP) in DECRA(1) equation in CREEP
>  > subroutine.
>  > whether i need "UVAR(1) = ARRAY(1)" this kind of statement UVARM? if so
>  > then when i am defining mises at some place in DECRA(1) do i need to
>  > write Mises or UVAR(1).
>  >
>  > i dont know how to store these variables (MISES and SP) in UVARM?
>  >
>  > and how to use these in creep subroutine. Kindly tell me by giving some
>  > example.
>  > i hope i could covey my doubt.
>  >
>  > Kind Regards,
>  >
>  > -Goyal
>  >
>  >
>  >
>  >
>  > --- On Thu, 5/5/11, Dave Lindeman <ddlindeman <at> mmm.com
> <mailto:ddlindeman%40mmm.com>
>  > <mailto:ddlindeman%40mmm.com>> wrote:
>  >
>  > From: Dave Lindeman <ddlindeman <at> mmm.com <mailto:ddlindeman%40mmm.com>
> <mailto:ddlindeman%40mmm.com>>
>  > Subject: Re: [Abaqus] creep subroutine
>  > To: Abaqus <at> yahoogroups.com <mailto:Abaqus%40yahoogroups.com>
> <mailto:Abaqus%40yahoogroups.com>
>  > Date: Thursday, May 5, 2011, 7:00 PM
>  >
>  > Does the line:
>  >
>  > DIMENSION ARRAY(15),JARRAY(15),JMAX(*),JMATYP(*),COORD(*)
>  >
>  > appear in your UVARM subroutine?
>  >
>  > Regards,
>  > Dave
>  >
>  > Dave Lindeman
>  > Lead Research Specialist
>  > 3M Company
>  > 3M Center 235-3F-08
>  > St. Paul, MN 55144
>  > 651-733-6383
>  >
>  > On 5/4/2011 11:54 PM, sunil goyal wrote:
>  > > Hi friends,
>  > >
>  > > I am trying to write a subroutine "CREEP" with "UVARM". The
> constitutive
>  > > equation for creep requires von-Mises stress and SP3 (max. principal
>  > > stress) from previous increment. I used GETVRM to get these values from
>  > > last increment.
>  > >
>  > > call GETVRM('SINV',-----)
>  > > MISES=ARRAY(1)
>  > > call GETVRM('SINV',-----)
>  > > SP3=ARRAY(1)
>  > > but it is giving werror "This name has not been declared as an array"
>  > >
>  > > Whether i need to write UMAT in such a case or it is possible to call
>  > > SP3 and MISES in CREEP subroutine.
>  > >
>  > > Kind Regards,
>  > >
>  > > -Goyal
>  > >
>
> 

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