Abstract
Deformation and fracture of brittle materials, namely glass and ceramics, during the indentation with hard spherical indenters was first investigated in detail by Auerbach [1]. Recent reviews are due to Lawn [2] and Fischer-Cripps [3]. For comparatively large indenters, pure elastic material response, characterized by Hertzian ring cracks, can be noted. If load increases further and exceeds a critical threshold, localized plastic flow takes place which is accompanied by radial and lateral cracking. Lateral cracking is the primary source of chip formation and removal of material from the surface. This stage is illustrated in Fig. 1. Indentation of glass plates with hard materials is associated by a number of processes, such as of flow, densification, fracture, crack bifurcation, etc. [4]. In the present paper, however, another secondary fracture phenomenon is discussed that was observed
Published Version
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