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pamcrash, thank you for response. My model is cavity expansion in abaqus standard. I checked units, it is consistent.

I am applying prescribed displacement to series of nodes at a boundary, but when it runs, only those applied nodes move and other parts of mesh stay unchanged. does anybody knows whats my problem? regards

thank you for response, Abaqus doesn't accept any UMAT with porous element. is there any method to solve this problem?

Hi I am writing UMAT for saturate clayey soil, but we know that ABAQUS built-in porous element is not compatible with UMAT. Does any body have any advise to solve the problem? Regards

You should first check your predefined field to see you have defined all required, and second check boundary conditions.