摩擦による熱応力を伴う繰返し転がり接触を受ける超硬合金およびセラミックスの疲労表面き裂進展挙動

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rights: 本文データは社団法人日本機械学会の許諾に基づきCiNiiから複製したものであるThis paper deals with the surface fatigue crack growth behavior in cemented carbides and ceramics under repeated rolling contact with frictional heating. In this analysis, a surface crack is modeled as an inclined planar surface crack in a three-dimensional half-space. Rolling contact is simulated as a long and narrow distributed load with both normal and shear components moving with constant veloccity. First, the three modes of stress intensity factors along the crack contour are analyzed. Next numerical calculations of the stress intensity factors are carried out for cemented carbides and ceramics. On the basis of these data, numerical results for crack growth contours are given based on a modified Paris power law. The threshold values are obtained by rotary and plane bending fatigue tests for WC-Co cemented carbides and Si_3N_4 ceramics. Morever, the thermal effects on the crack propagation life are considered for each material.
1997-03-25