断続切削における切れ刃欠損の解析的予測に関する研究(第6報) : 超硬合金の衝撃劣化過程と劣化状態の等価的換算について

概要

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Using the impact loading machine reported before, the deterioration process of sintered carbide material is discussed quantitatively under cyclic impact loads at room temperature. The main results obtained are as follows : (1) When the uniaxial cyclic compressive load is applied on the sintered carbide material, the compressive fracture stress does decrease not only in the loading direction but also in the transverse one, and the tensile fracture stress also decreases. (2) Many small cracks or voids with random sizes and directions around WC particles in the sintered carbide material are generated after cyclic uniaxial impact compressive or tensile loading. (3) Both the features of structure and fracture stress indicate that the deterioration of material is isotropical and there is no difference in the process except the deterioration rate between impact tensile and compressive loadings. (4) The hypothesis for quantitative estimation of the equivalent tensile stress , to generate the same deterioration state under multiaxial stressing is proposed and verified through impact uniaxial compressive and tensile deterioration experiments.
公益社団法人精密工学会の論文
1983-05-05