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研究(その1)

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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 the cyclic displacement with various amplitude for steel materials have already reported. Moreover, in the previous report, results of the preliminary consideration on the crack initiation strength of aluminum alloy (JIS A5083P) under the cyclic large displacement after undergoing buckling collapse were reported. In this paper, results of studying on the characteristic of strengths in tension of the prestrained material, and the crack initiation strength under the cyclic large displacement after undergoing buckling collapse with strip specimens for aluminum alloy (JIS A5083P) are reported. As a result of this study, following conclusions were obtained. (1) The characteristic of strengths in tension (0.2% proof stress, tensile strength, elongation) of aluminum alloy (JIS A5083P-O) with up to 50% axial prestrain in compression were obtained. (2) It became to be able to assess the crack initiation life of aluminum alloy (JIS A5083P-H321) under the cyclic large displacement after undergoing buckling collapse.
社団法人日本船舶海洋工学会の論文
2003-08-31

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研究(その1)

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