UMAT: Coordinates of integration points

[martmachado]

Hi,

I'm writing an UMAT and I need to have simultaneously the coordinates of my 4 integration points so I can compute the "shear angle". The problem is that (maybe I'm wrong with this) UMAT is called again for each integration point at each iteration so the variable COORD is updated to the current integration point.

The only solution I could come up with is to save the coordinates in files and then read them when needed. Although I haven't tried this yet, I'm afraid that writing and reading files might take some time, especially in large models.

I was wondering if somebody already had this problem. Any comments are helpful! Thanks in advance!

Martín.-

 

[akabarten]

Hi,

I have no experience with UMAT but FORTRAN point of vie you can use COMMON block to store all needed information in memory.
Limitation is that you can run analysis only with 1 CPU.

Regards,
Bartosz

 

[martmachado]

Thanks a lot Bartosz! I'll try both things and let you know.

 

[martmachado]

I used SAVE to store the info in memory and fortunately it worked fine. It also allowed me to use more than one CPU.

 

[IceBreakerSours]

Cool! I did not know that option even existed. Thanks for posting the resolution.

Are you new to this forum? If so, please read these FAQ:

http://www.eng-tips.com/faqs.cfm?fid=376

http://www.eng-tips.com/faqs.cfm?fid=1083