Hello everyone. I want to share one of the recent problems I'm facing in my research and that is to model the soil material. The soil in FEM are usually modeled as a hypoplastic soil. My questions are

1) what is hypoplastic?

2) Why do we need to define soil as a hypoplastic material?

3)How to input material properties for a hypoplastic soil in ABAQUS?

4) Do we need elastic properties too for a hypoplastic soil model or only hypoplastic properties are enough?

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