Ushnish Basu
Ansys Employee

Dear WooMin,

You can use DEFINE_ADAPTIVE_SOLID_TO_SPH to transform a solid element to an SPH particle, though the material properties will be taken from the original solid element.

If you want your material to behave more like a fluid after yielding, you can just define it appropriately in the material routine itself, no need to call a separate routine. 

f3dm9sph_userdefin is called from within MAT_SPH_VISCOUS, and it;s not meaningful to call it from elsewhere.