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I wanted to simulate materials like loose sand or clay-like materials. What would be the best settings and properties to set?
It might depend on the kind of analysis, but you probably can take a look at Mohr-Coulomb and Drucker-Prager
https://help.altair.com/2023.1/hwcfdsolvers/altair_help/topics/release_notes/rn_2023_1_optistruct_r.htm
how i can set up the mohr coulomb analysis through hypermesh? Usually i conduct a linear direct transient analysis with a mats1 card for the soil material.