Contact stiffness composite body #636
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I added a function
Real ContactStiffness(size_t index_i)inSolid. For composite material, it will returncomposite_materials_[(*material_id_)[index_i]]->ContactStiffness();.In
RepulsionForce,solid_material->ContactStiffness()is replaced bysolid_material->ContactStiffness(index_i).I think the contact impedance of self-contact also needs to be modified. How should be calculate the impedance between particle i and j with different rho and contact stiffness?