Dynamic Elastic Model of Ceramic Stock Removal
Considerable work has been done on stock removal processes in metals; and on the failure properties of ceramics under ballistics impact. The former is dominated by plastic deformation prior to fracture, whereas the latter is. dominated by the propagation of a shock front which causes brittle fracture. For the process of ceramic stock removal as encountered in practice, neither of these mechanisms play dominant roles, i. e., neither the ceramic sample is expected to manifest plastic flow, nor do the practical machining techniques generate shock fronts. The theoretical model is thus different from commonly accepted theories of “cutting” and “brittle fracture in ceramics”. We shall describe a model where the cutting tool is a single diamond point as shown in Fig. 1. The conical diamond rotates with an effective radius R and is set to cut a V-shaped groove of depth r. The total length of the groove l is traversed by the cutting point in a large number of passes as the sample is fed with a velocity v.
KeywordsCrack Length Grain Size Distribution Shock Front Stress Wave Wheel Speed
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