Geometric deformation calculation problem

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Hello everyone,

I'm a beginner with COMSOL and currently attempting to simulate the compression in asperities contact. Under the 2D assumption, I have two rock blocks pressing against each other, where the upper rock block moves downward with a specific displacement per hour, and the lower rock block is fixed.(Fig.1.)

I have some questions regarding the results:

  1. Although the upper rock block moves downward over time, it seems that the original frame lines remain in place.(Fig.2.&Fig.3.) Is this because the mesh hasn't actually displaced? Is there a way to make it move?

  2. When the contact points are pressed together, they deform, but not in the way I expected.(Fig.4.) Is it possible to simulate the fracture of the contact points upon compression?

Thanks for your reading! I am looking forward to your reply!

Nick



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