Problem in using Hypoplastic model for sand in Abaqus

[Isam.]

Hello,
I am using the UMAT code for sand hypoplasticity provided by Prof. Masin —

https://soilmodels.com/download/plaxis-umat-hypoplas-zip/.

I am simulating Axisymmetric condition in Abaqus. To check the results given by the hypoplastic model for sand. I started with a simple model. I have two steps: Geostatic step and pressure step. The parameters used as shown in the figure (Depvar=13). I added permeability for the soil because I need it.

The problem is when I run the model using the UMAT code, it completes without showing/implementing any step calculation and no results will be found. When I use one of the materials models built in Abaqus, the model runs correctly. What is the issue. could you Please help !!.

Thanks in advance.
Isam

 

[FEA way]

Try using this subroutine in a single element test with minimum complexity. You can find exemplary input files in Abaqus Verification Guide.