help help nitinol cable

[maxwolf2011]

hi
I'm new in this forum and I've a problem that i can't resolve. I am
M.Sc.Civil engineer and I'm modleing shape memory alloys using in bracing
system.I need to model nitinol in Abaqus.
how can i idintify this material in Abaqus?
do i have to code this model and write subtoutine in fotran or it
already exists in ABAQUS ?
what is in summery the steps that i have to do??
Search for answer ID in

http://simulia.custhelp.com/cgi-bin/abaqus.cfg/php/enduser/home.php

1658 UMAT and VUMAT routines for the elastic-plastic simulation of Nitinol
4699 Abaqus/CAE plug-in utility to calibrate Nitinol material behavior

but I did not find any of these answers, but please help
another question,How do I design nitinol cable in abaqus, as a solid or wire ?
I don't have much time to finish my thesis
thanks for giving some of ur time for my questions
BEST REGARDS.

 

[burningDiesel]

There is an existing subroutine

http://www.eng-tips.com/viewthread.cfm?qid=253034

you don't need to install anything if you have abaqus above 6.8.
set depvar to 24 and give all the parameter values needed (15 if i recall correctly)
name your material abq_super_elastic_nXd to get the superelastic material subroutine, with X being ur dimension (1 2 or 3)

for a cable, u can use beam (if it's a thick cable w bending stiffness) or a truss element (u can set compression resistance to zero as well)
let's hope ur supervisor doesn't check this forum

grt

 

[IceBreakerSours]

Setting the "No compression" flag may get the job done but the model may not be as robust as nonlinearities are piled up on it. This flag results in a sharp transition (a discontinuity) in the stress-strain curve and numerical algorithms end up going nuts trying to converge to a solution in such situations.

I believe the exact same question was asked a few days ago in the ABAQUS Yahoo! group where it was pointed out that ABAQUS' own forum has a SMA model available free for download. Check it out.

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

 

[maxwolf2011]

thanks sdebock and IceBreakerSours