低サイクル疲労下におけるハイブリッド構造物中の複数疲労き裂伝ぱの相互作用に関する研究

概要

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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The interaction of crack propagation on multiple ended fatigue cracks in hybrid structures is examined with the coupled compact tension specimens of 0.45%C carbon steel and A2017-T4 aluminum alloy under high cyclic stresses. The crack propagation behavior of coupled specimens fatigued under the stress ratio of 0.05 and 0.7 is compared with that of single cracked specimen. The deviation of crack propagation rate from the stable relation between the rate and ΔK of a single specimen is found to take place with the difference of crack closure and the onset of the ratcheting extension of specimens. The crack growth acceleration is affected by another specimen coupled because of the incomplete reversal of plastic deformation in ratcheting deformation. Based on the theoretical prediction of an interaction curve for crack growth of a coupled specimen, it is concluded that multiple ended fatigue cracks under high cyclic stresses propagate with a mechanism such that the increment of total strain energy release per cycle in a hybrid body including some cracks is distributed to each crack with the ratio of strain constraint factor.
一般社団法人日本機械学会の論文
1989-01-25