アルミニウム合金材の繰り返し大変形曲げによる亀裂発生強度に関する一考察

概要

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It is known that when buckling collapse takes place in structural members of a large-scale welded steel structure, the ductility and fracture toughness at the concave side of buckling deflection deteriorate due to large compressive plastic strain. It is also known that if structural members are subjected to the tensile or cyclic load continuously, cracks may easily initiate and propagate at the concave side of buckling deflection. Effects of large compressive plastic strain on the strength, notch toughness and fracture toughness, and results of assessing and studying quantitatively on the crack initiation strength under cyclic displacement with various amplitude for steel materials have already reported. In this paper, results of preliminary consideration on the crack initiation strength of less than 100 cycles for aluminum alloy (JIS A5083P-H321) under large cyclic displacement are reported. As a result of this study, the experimental equation between the nominal strain at first compression [ε (%)] and the number of cycles to 0.5mm long crack initiation [Nc (cycles)] has been obtained as a follow. ε=1.57×10・Nc^<-3.15×10^<-1>>
社団法人日本船舶海洋工学会の論文
2003-03-20