I am using the UMAT code for clay hypoplasticity provided by Prof. Masin — https://soilmodels.com/download/plaxis-umat-hypoplas-zip/
I made a oedometeric test model in Abaqus2018 and applied the umat code (umat_hcea.for), the parameters I used are listed in the Fig.1. However, the result show the void ratio of whole model was 0 when the simulation started. In my understanding the initial void ratio doesn’t necessarily to be determined by users and can be calculated by other parameters. Am I right? And if I want to specify a void ratio, where can I input the value?
Thank you very much!