セラミックスの切削における材料除去 : 大規模破壊過程におけるクラック進展経路の線形破壊力学による考察

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It was previously found that material removals of ceramics by cutting were carried out in two -categories; large scale fracture and small scale one. Crack trajectory by the large scale fracture is presently studied by experiments and numerical analysis of incipient stage of the orthogonal cut-ting. The following results are made c]ear. (1) A crack initiates at the region near the tool tip and unstably extends slightly downwards. Its subsequent extension varies depending upon properties of materials and depth of cut. One is arrested and the other propagates until chip is formed. The latter belongs 'to either of two types; one is for the crack which turns upwards from some depth and emerges out at the upper free surface, the other is for the crack which traverses the work. (2) So long as the crack propagates downwards, its trajectory is nearly coincident with the stress trajectory of the minimum principal stress. (3) When the arrested crack re-extends by the progress of the tool, it propagates more downwards than before arrest. This is because the stress intensity factor K_<II> is positive. (4) When the crack trajectory turps upwards, material crushing of compression type or shear type is always observed just in front of the tool rake face. (5) The material crushing occurs more easily for materials having lower strength ratio of compression to tension and at lower depth of cut. Consequently the crack trajectory turns upwards earlier.
公益社団法人精密工学会の論文
1983-04-05

セラミックスの切削における材料除去 : 大規模破壊過程におけるクラック進展経路の線形破壊力学による考察

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