![]() ![]() The vertical wedge-tip separation that releases chips to slide up to the surface, and the work associated with it, were not considered.Ī hemispherical-ended round chisel driven vertically into a block of a brittle solid produces the well-known Hertz–Roesler cone crack. The analysis took into account friction on the wedge faces and used an empirical expression for the crushing load given by P crush = (const) (δ − δ o), where δ is penetration (δ o is the penetration when the first chips form). Sikarskie and Cheatham (1973) modelled the behaviour using the Coulomb–Mohr failure envelope (see Chapter 14) to represent pressure-dependent fracture along the inclined cracks between the tip of a wedge and the surface. ![]() Cutting of a brittle material by a wedge: (A) model of penetration (B) characteristic force–penetration curves for a charcoal grey granite cut with 25 mm wide wedges having the angles indicated. ![]()
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