iMechanica - Matlab - Comments

Re:

alankar — Wed, 24 Sep 2008 18:36:12 -0400

Alankar
Ph.D. Student
School of Mechanical and Materials Engineering
Washington State University, Pullman

hi Alankar

Yuanpei Duan — Wed, 17 Sep 2008 22:01:02 -0400

hi Alankar,

Could you help me about this question? Thank you very much!

http://www.imechanica.org/node/2909#comment-8695

Re:

alankar — Wed, 17 Sep 2008 11:15:46 -0400

Hi Phamhung,

Thanks for taising the question again. I think the problem is with incompatibility of MATLAB drivers with in ABAQUS environment. I wrote to Simulia for this and they said no. I am hoping that somebody has written small patch of trick code/driver for such connection.

Alankar
Ph.D. Student
School of Mechanical and Materials Engineering
Washington State University, Pullman

Abaqus and UMAT

phamhung — Tue, 16 Sep 2008 08:46:58 -0400

hi all

I just repeat the same question of Alankar "

"Connecting ABAQUS with MATLAB"

I don't know if the Umat subroutine in Abaqus can be writen by matlab

and I also read a text from abaqus documentation :

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"A FORTRAN compiler is required to compile and link user subroutines for
Abaqus. If you prefer to write user subroutines in languages other than
FORTRAN, you must have the FORTRAN compiler specified, a compiler for your
language, and the knowledge of how to call routines in your language from
FORTRAN. SIMULIA cannot guarantee compatibility of Abaqus with user subroutines
written in programming languages other than FORTRAN".

anyone had been successful with Matlab?

Thanks

Hung

Phd Graduate student

Some further links on Matlab and Abaqus, including the reverse!

Mike Ciavarella — Sat, 19 Jul 2008 05:03:12 -0400

Running Abaqus in Matlab environment « FEG: A journey of a mind

Following shows you a snip how to perform the analysis repeatedly in Matlab. for i = 1 : 10 istatus = dos(’abq661 job=filename interactive’); % Run Abaqus, ...
fegs.wordpress.com/2007/08/08/running-abaqus-in-matlab-environment/

ABAQUS: ABAQUS FEA Solver - Using Matlab in Abaqus

I am new to both Abaqus and Matlab and i would appreciate if some one can help me a bit in interfacing Matlab with Abaqus. I am doing a buckling analysis of ...
www.eng-tips.com/viewthread.cfm?qid=218317&page=3 - 24k

Essays.se: ABAQUS AND MATLAB

Hi! I have to do a

yasir-z — Thu, 17 Jul 2008 05:34:30 -0400

Hi!

I have to do a similar thing but since i am new to both Abaqus and matlab i wd appreciate if any one of you can give me some sort of example file that i can use to learn how to connect both sofwares. I have tried on my own with the guidelines u described but it didnt work. my email is yasirzahoor@yahoo.com.

Thanks

Yasir

Hi Ruogang, I cannot

hamanh — Fri, 16 May 2008 10:02:39 -0400

Hi Ruogang,

I cannot get the complemental data of the paper mentioned above. Could you please somehow send me that part ?

(hamanhmc@gmail.com)

Thank you very much

Hamanh

Re: Using MATLAB functions in a ABAQUS subroutine

Mike Graham — Thu, 15 May 2008 13:20:17 -0400

It appears to be possible to call Matlab from Fortran, but I've never done it. It is certainly feasible.

Using MATLAB functions in a ABAQUS subroutine

alankar — Wed, 14 May 2008 20:09:42 -0400

Hi,

Does anybody know if MATLAB functions/scripts can be called in to an ABAQUS subroutine like UMAT?

Thanks,

Alankar Ph.D. Student School of Mechanical and Materials Engineering Washington State University, Pullman

Hi Ruogang, I have been

raul_bobby — Wed, 14 May 2008 14:10:36 -0400

Hi Ruogang,

I have been lucky today, i managed to sort out my problem, and everything works as it should, which leads me to the next step of my research. Thank you very much for your help anyways, im sure i will be back to ask more questions if im stuck. Thanks!

Regards,

Raul

Hi Ruogang, Thank you

hamanh — Wed, 14 May 2008 14:04:51 -0400

Hi Ruogang,

Thank you very much for pointing out the procedure. I was about to ask to do exactly the same issue as Raul has when I cought you explaination !

Hamanh

re:Running ABAQUS CAE through MATLAB 7

ruogang zhao — Wed, 14 May 2008 12:53:04 -0400

Hi Raul,
Yes, it's feasible. I'm doing the similar thing. To call a executable in Matlab without quitting it, just use the "!".

You can check out Matlab help: Running External Programs

Check out this paper: Journal of Biomechanics 40 (2007) 936–940 and its supplement material, this is exactly what you look for.

Good luck.

Ruogang

further question

damoonmoetamedi — Sun, 09 Dec 2007 11:04:57 -0500

Hi nguyen,

I am working on your matlab source.

why you use crack angle (alpha) for calculating jacobian of drdx in branch.m.

Later, you use gauss point angle (tetha) to calculate drdx in j-integ?

Another problem,is not related to your matlab source, do you know how could I calculate dynamic J-Integ, because there are terms which are related to velocity of auxiliary displacement and strain.

thanks for your time,

Damoon

Hi Stephano, Sorry for

vinh phu nguyen — Sat, 24 Nov 2007 04:07:34 -0500

Hi Stephano,

Sorry for very late reply however I did not notice your post.

I agree that the third and fourth functions are different from the one of another authors. However I did not find big differences between them.

Concerning the derivatives, I used bad names for the variables. Using the chain rule, we write, f(r,theta)

dfdx = dfdx1 * dx1dx + dfdx2 * dx2dx

dfdy = dfdx1 * dx1dy + dfdx2 * dx2dy

What you see in my code, dfdr is in fact dfdx1 and calculated in advance by hand as

dfdx1 = dfdr * drdx1 + dfdt * dtdx1

I just posted the corrected code with renamed variables.

Hope that it was a bit of help.

Phu