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2)

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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 been reported. Moreover, in previous reports, results of the consideration on the crack initiation strength of an aluminum alloy (JIS A5083P) under the large cyclic displacement after undergoing buckling collapse were reported. In addition, results of studying on the tensile strength characteristic of the prestrained material (JIS A5083P) were also reported. In this paper, an attempt was made to developed the evaluation method for the crack initiation strength under the large cyclic displacement after undergoing buckling collapse for the aluminum alloy (JIS A5083P). The crack initiation test using a strip specimen and the FE-analysis were performed. Moreover, in order to obtain the true stress〜true strain relationship under a cyclic large strain range of the aluminum alloy (JIS A5083P), an axially cyclic material test was carried out. As a result of this study, following conclusions were obtained. (1) The true stress〜true strain relationship under a cyclic large strain range of the aluminum alloy (JIS A5083P) was obtained in detail. (2) Relationships between longitudinal strain range of the second cycle at the crack initiation part and number of cycles to crack initiation and to fracture can be expressed by linear functions on logarithmic scale. (3) It is possible to assess the crack initiation life of the aluminum alloy (JIS A5083P-H321) under the large cyclic displacement with various amplitudes after undergoing buckling collapse.
社団法人日本船舶海洋工学会の論文
2004-08-31

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2)

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