き裂を有する片持ちばりの衝撃曲げにおける動的破壊特性

概要

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Subsequent to previous reports, this paper is concerned with the dynamic fracture criterion and dynamic fracture behavior of a cracked cantilever, which is subjected to a transversal impact. Experiments were performed on four kinds of specimens of different sizes. By means of the dynamic photoelastic method using a high speed image converter camera, the change of the dynamic stress intensity factor and the crack propagation phenomenon were analysed. Moreover, the dynamic finite element method was used to analyse the dynamic stress intensity factor and the dynamic fracture behavior. The results showed that there was a trend toward a larger time delay for the dynamic stress intensity factor with an increasing crack length, compared with that for the incident stress. Also, they showed that experimental stresses for initiating crack propagation could not be explained simply from the static similar laws.
一般社団法人日本機械学会の論文
1985-11-25