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Only limited unit number (from 1 to 100) can be used. most are reserved. Try something larger than 100.

USE state variable, SDVn, n=1,2,3

You can request in the input.

Go with 1 element test first. Check: 1) stress update in umat;2) Jacobian Contact abaqusDr@gmail.com with input, umat and reference papers for umat if you do need help

Two solutions: 1) add stabilizie to *step 2) add contact controls,stabilize

Put all subroutines in the same file

Since you have only discrete mises stresses, it is hard. If you can somehow get the stress components, then using *initial conditions,type=stress.

That means your UMAT is not properly writen. Strain softening is not the direct cause. Check your jacobian.

100Sec is too large to use xpl. Try std, contact pair, surface to surface, finite slide contact.

Viewer can do that.

I did this before. Use python to extract the exterior boundary of the deformed specimens and call cae mesh modulus after in the same python. Then you can play with the newly generated mesh with whatever you want. Contact abaqusdr@gmail.com if you want further help.

As far as I know, in Standard, this is an undergoing project for beam to beam contact