切欠きを有する板材の引張りにおける弾塑性変形および破壊

概要

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Tensile tests of Ti-6Al-4V and S45C plates with a hole were performed, and the characteristics of deformation near the hole were investigated through finite-element analysis. To clarify the crack initiation conditions, the relationship between the deformed shape of the notch and the equivalent plastic strain at the crack initiation is calculated. The main results are summarized as follows. (1) The critical equivalent plastic strain of a notch root for a crack initiation is determined by the value of notch root radius ρ alone, independent of notch depth. (2) Fact (1) can be explained through similarity of relative equivalent plastic strain distributions. (3) The deformation parameter h/d (h : height of circular hole after deformation, d : diameter of the hole) calculated by FEM is in good agreement with the experimental result in the range where no crack is initiated inside a plate in Ti-6Al-4V or no large deformation of the inhomogeneous structure including small cracks occurs in S45C.
一般社団法人日本機械学会の論文
1994-07-25