About simulating rock-like material

Submitted by xiuhan on Mon, 07/01/2013 - 11:42

Hi all, I wanna simulate brittle material like rock, which means the bonds between particles should start from a bonding model with certain strength(both in normal and shear direction), then after loading (acting external force), the bonds should break and then the particles can move freely so that a collision model should be applied.
Does anyone have similar problem, how you solve it with liggghts, what contact model you used?
really appreciate any reply.