> Dear Fellows:
> 

Dear Murat,

> I am wondering if are there any people doing UMAT-ABAQUS
> implementation where in the user subroutine, solution of
> system of equations are required for stress and state
> variable updates? The overall scheme is such that
> the internal loop trys to find a common solution to
> the system of equations and when it finds outer loop
> (i.e. ABAQUS ) iterates the strains and forces
> for equilibrium. Inner loop is based on multi-dimensional
> Newton-Raphson scheme and when stress is updated, ABAQUS gave
> DSTRAN array as NaN (Not a Number). What would be your suggestion?
> 

Why do you want to do it? We have done something like it in another 
software because the constitutive equation hsa to be inverted. Thank 
you for your attention.

> Regards,
> Murat
> 

regards,

Andrew
--
Science is not describing how nature is
but rather express what we can say about nature.

Dr. Andrew H.C. Chan: [log in to unmask] or [log in to unmask]
Reader, School of Civil Engrg, Univ of Birmingham B15 2TT UK
Tel: +44(0)121 414 5100 Fax: +44(0)121 414 3675 Mobile: 0777 324 3055
http://www.bham.ac.uk/CivEng/pg/soils/chan/chan01.htm


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