Fracture-based model of periodic-arrayed indentation for rock cutting. (June 2015)

• Record Type: Journal Article
• Authors: Xie, Y.J.; Wang, X.H.; Hu, X.Z.; Zhu, X.Z.
• Is Part Of: International journal of rock mechanics and mining sciences. Volume 76(2015:Jun.)
• Page Start: 217
• Page End: 221
• Publication Date: 2015-06
• Subjects: Surface fracture -- Contact mechanics -- Indentation stress intensity factor -- Indentation -- Rock cutting; Rock mechanics -- Periodicals; Soil mechanics -- Periodicals; Mining engineering -- Periodicals; Roches, Mécanique des -- Périodiques; Sols, Mécanique des -- Périodiques; Technique minière -- Périodiques; 624.151305
• DOI: 10.1016/j.ijrmms.2015.03.018
• Languages: English
• ISSNs: 1365-1609

Abstract

Abstract: Periodic singular stress fields and K -dominant regions arise adjacent to sharp 90° indenter edges if an elastic substrate is subject to indentation with rigid, flat-ended and periodic indenters. The concept of indentation stress intensity factor K ind is convenient to describe such a singular indentation stress field, which is mathematically similar to that of a Mode-I crack. The singular indentation stress field is sufficient to induce surface cracking even if the substrate surface is free of any micro-cracks. This surface cracking mechanism generated from the flat-ended indentation potentially can play a significant role in damage analysis of rock cutting. During the rock-cutting processing, those periodic singular-stress fields will move along the rock surface, leading to continuous rock surface fracture. In this study, a fracture mechanics model is proposed for rock breakage by using an energy-based approach. The indentation stress intensity factor K ind and indentation cracking equation for rock-cutting/breakage have thus been formulated analytically. Highlights: A periodic-arrayed indentation model for rock cutting is proposed. The contribution of the singular stress fields to rock cutting is investigated. Fracture-based rock cutting criterion have been formulized.