gs.materials.MPM.Sand

class genesis.engine.materials.MPM.sand.Sand(E=1000000.0, nu=0.2, rho=1000.0, lam=None, mu=None, sampler='random', friction_angle=45)

基类：Base

sand_projection(S, Jp)

update_F_S_Jp(J, F_tmp, U, S, V, Jp)

update_stress(U, S, V, F_tmp, F_new, J, Jp, actu, m_dir)