ぜい性材料の三次元すべり接触時のき裂進展に対する弾・塑性遷移圧子半径

概要

論文の詳細を見る
Two types of sliding contact between a hard indenter and a brittle material were presently adopted : one is a conventional type and the othera grinding type. A fraction of heat flowing into the material in the grinding type was theoretically shown to be described by a function of a Peclet number and to be almost the same as that in the conventional type under the normal grinding conditions. The critical indenter radius, R_c, which distinguishes the occurence of plastic deformation from the elastic cracking as the first damaging event in the material, was analyzed under the mechanical/ thermal load conditions. Increase in R_c with an increase in sliding speed V was very high in Al_2O_3 because of low thermal diffusivity κ, high thermal conductivity K and high thermal constant M=αE/{π(1+ν)ρC} ( where, α : coefficient of expansion, E : Young's modulus, ν : Poisson's ratio, ρ : density, C : specific heat). While a similar relation between R_c and V was also found in Si_3N_4, the increase in R_c with an increase in V was small in glass and SiC of low K and high κ, respectively.
社団法人日本材料学会の論文
1992-02-15