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Re: Modelling a Shape Memory Alloy
by moez
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Hello Akin,
You must use UMAT subroutine. It is a fortran subroutine where you must change
only the corps but not the subroutine name nor the variables names.
Uou have as input the values of differents variables at the last iteration and
the strain and temperature increments (called DSTRAN and DTEMP) and you must
calculate as output the tangent stiffness matrix, and the new value of strain
and stress vectors at current iteration.
Here is an exemple:
SUBROUTINE UMAT(STRESS,STATEV,DDSDDE,SSE,SPD,SCD,
1 RPL,DDSDDT,DRPLDE,DRPLDT,
2 STRAN,DSTRAN,TIME,DTIME,TEMP,DTEMP,PREDEF,DPRED,CMNAME,
3 NDI,NSHR,NTENS,NSTATV,PROPS,NPROPS,COORDS,DROT,PNEWDT,
4 CELENT,DFGRD0,DFGRD1,NOEL,NPT,LAYER,KSPT,KSTEP,KINC)
C
INCLUDE 'ABA_PARAM.INC'
C
CHARACTER*80 CMNAME
DIMENSION STRESS(NTENS),STATEV(NSTATV),
1 DDSDDE(NTENS,NTENS),DDSDDT(NTENS),DRPLDE(NTENS),
2 STRAN(NTENS),DSTRAN(NTENS),TIME(2),PREDEF(1),DPRED(1),
3 PROPS(NPROPS),COORDS(3),DROT(3,3),DFGRD0(3,3),DFGRD1(3,3)
user coding to define DDSDDE, STRESS, STATEV, SSE, SPD, SCD
and, if necessary, RPL, DDSDDT, DRPLDE, DRPLDT, PNEWDT
RETURN
END
________________________________
From: Frank Richter <abaqus-master@...>
To: Abaqus@...; abaqus@...
Sent: Tue, August 3, 2010 5:30:57 PM
Subject: Re: [Abaqus] Modelling a Shape Memory Alloy
Hello Akin,
seems you should have looked for a material model long before.
There is a built-in model for SMA in ABAQUS, but quite hidden.
Surf to the "Simulia online support system"
http://simulia.custhelp.com/cgi-bin/abaqus.cfg/php/enduser/home.php
and look up answer ID 1658 entitled
"UMAT and VUMAT routines for the simulation of Nitinol".
You will find all relevant files there.
Note that the model must be assigned a particular name as mentioned on the
footnote in "umat_superelasticity.pdf".
This is Auricchio's model and can model superelasticity. Is that sufficient for
you ?
Good luck,
Frank
-------- Original-Nachricht --------
> Datum: Tue, 3 Aug 2010 09:09:31 +0000 (GMT)
> Von: akin Owoyele <redgoogles@...>
> An: abaqus@...
> Betreff: [Abaqus] Modelling a Shape Memory Alloy
> Hello,
> I am a Masters Student in the University of Manchester. Please I will need
> to
> model a Nitinol spring in ABAQUS and I am stuck.I have been searching on
> the web
> and I have been seeing some stuff like UMAT or VMAT.I honestly dont know
> what to
> do as the deadline for the submission of my dissertation is fast
> approaching. I
> will need assistance in what to do in ABAQUS as I have already created in
> model
> and imported it to ABAQUS.
>
> Awaiting your favourable responses.
>
> Akin Owoyele.
>
>
>
>
> [Non-text portions of this message have been removed]
>
--
----------------------------------------------------------
Frank Richter
Institute of Materials Science
Ruhr-Universitaet Bochum
Bochum
Germany
GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT!
Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01
[Non-text portions of this message have been removed]
You must use UMAT subroutine. It is a fortran subroutine where you must change
only the corps but not the subroutine name nor the variables names.
Uou have as input the values of differents variables at the last iteration and
the strain and temperature increments (called DSTRAN and DTEMP) and you must
calculate as output the tangent stiffness matrix, and the new value of strain
and stress vectors at current iteration.
Here is an exemple:
SUBROUTINE UMAT(STRESS,STATEV,DDSDDE,SSE,SPD,SCD,
1 RPL,DDSDDT,DRPLDE,DRPLDT,
2 STRAN,DSTRAN,TIME,DTIME,TEMP,DTEMP,PREDEF,DPRED,CMNAME,
3 NDI,NSHR,NTENS,NSTATV,PROPS,NPROPS,COORDS,DROT,PNEWDT,
4 CELENT,DFGRD0,DFGRD1,NOEL,NPT,LAYER,KSPT,KSTEP,KINC)
C
INCLUDE 'ABA_PARAM.INC'
C
CHARACTER*80 CMNAME
DIMENSION STRESS(NTENS),STATEV(NSTATV),
1 DDSDDE(NTENS,NTENS),DDSDDT(NTENS),DRPLDE(NTENS),
2 STRAN(NTENS),DSTRAN(NTENS),TIME(2),PREDEF(1),DPRED(1),
3 PROPS(NPROPS),COORDS(3),DROT(3,3),DFGRD0(3,3),DFGRD1(3,3)
user coding to define DDSDDE, STRESS, STATEV, SSE, SPD, SCD
and, if necessary, RPL, DDSDDT, DRPLDE, DRPLDT, PNEWDT
RETURN
END
________________________________
From: Frank Richter <abaqus-master@...>
To: Abaqus@...; abaqus@...
Sent: Tue, August 3, 2010 5:30:57 PM
Subject: Re: [Abaqus] Modelling a Shape Memory Alloy
Hello Akin,
seems you should have looked for a material model long before.
There is a built-in model for SMA in ABAQUS, but quite hidden.
Surf to the "Simulia online support system"
http://simulia.custhelp.com/cgi-bin/abaqus.cfg/php/enduser/home.php
and look up answer ID 1658 entitled
"UMAT and VUMAT routines for the simulation of Nitinol".
You will find all relevant files there.
Note that the model must be assigned a particular name as mentioned on the
footnote in "umat_superelasticity.pdf".
This is Auricchio's model and can model superelasticity. Is that sufficient for
you ?
Good luck,
Frank
-------- Original-Nachricht --------
> Datum: Tue, 3 Aug 2010 09:09:31 +0000 (GMT)
> Von: akin Owoyele <redgoogles@...>
> An: abaqus@...
> Betreff: [Abaqus] Modelling a Shape Memory Alloy
> Hello,
> I am a Masters Student in the University of Manchester. Please I will need
> to
> model a Nitinol spring in ABAQUS and I am stuck.I have been searching on
> the web
> and I have been seeing some stuff like UMAT or VMAT.I honestly dont know
> what to
> do as the deadline for the submission of my dissertation is fast
> approaching. I
> will need assistance in what to do in ABAQUS as I have already created in
> model
> and imported it to ABAQUS.
>
> Awaiting your favourable responses.
>
> Akin Owoyele.
>
>
>
>
> [Non-text portions of this message have been removed]
>
--
----------------------------------------------------------
Frank Richter
Institute of Materials Science
Ruhr-Universitaet Bochum
Bochum
Germany
GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT!
Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01
[Non-text portions of this message have been removed]
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