When an elastic substrate is subject to indentation with rigid, flat-ended and periodic indenters, a periodic singular stress fields and K-dominant regions should arise adjacent to the indenter edges. The concept of indentation stress intensity factor Kind can be introduced to describe the singular indentation stress field, which is mathematically similar to that of a Mode-I crack. The singular indentation stress field is sufficient to induce cracking from the crack-free surface, which should potentially play a significant role in damage analysis of rock cutting. Actually, during the rock cutting processing, such the periodic singular stress fields moving along the rock surface will cause the rock boundary fracture continually. In the present article, a fracture-based model is proposed for rock breakage by using an energy-based method. The indentation stress intensity factor Kind and indentation cracking equation for rock cutting model have been formulized.

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