user subroutine in ABAQUS

[Jalaltaher]

Hi every body

I have a model with varied modulus of elasticity (E) with normal stresses sx, sy

E ... .......... .. SX ..... SY
200000 ..... < 500 .... > 500
20000 ..... < 500 ..... > 500


I have used user USDFLD subroutine in ABAQUS but I MAKE SURE that I have some mistakes and I donot not know how to solve. I do not understand USDFLD user subriutine well.

The CAE file and user subroutine are attached here.
please see the both files and help me to fix the problems.

thanks in advance


Jalal