EXTREMELY LOW CYCLE FATIGUE ASSESSMENT METHOD FOR UN-STIFFENED CANTILEVER STEEL COLUMNS
EXTREMELY LOW CYCLE FATIGUE ASSESSMENT METHOD FOR UN-STIFFENED CANTILEVER STEEL COLUMNS
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DOI：
10.2208/jsceja.64.288
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
K. Tateishi;Tao-Hsing Chen;T. Hanji
中科院分区：
文献类型：
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作者：
K. Tateishi;Tao-Hsing Chen;T. Hanji
本文给出了无加劲悬臂柱在增量和等幅循环荷载作用下的计算结果。本研究的目的是调查极低周疲劳寿命的列，并验证所提出的应变为基础的方法。在试验过程中，疲劳裂纹从拐角处的焊趾开始，并沿着焊趾扩展。最后，柱破裂而没有局部屈曲。阐述了大循环变形引起的低周疲劳失效。在进一步的步骤中，裂纹萌生寿命估计的基础上的局部应变，提出了简单的方法。结果表明，试验结果与估算寿命之间有较好的相关性。
This paper presents the results of un-stiffened cantilever column subjected to incremental or constant amplitude cyclic loading. The objectives of this study are to investigate the extremely low cycle fatigue life of the column and verify the proposed strain based approach. During the test, fatigue cracks initiated from the weld toe at the corner and propagated along the weld toe. Finally, the column ruptured without a local buckling. The failure of low cycle fatigue induced by large cyclic deformation has been elucidated. In a further step, the crack initiation life was estimated based on the local strain by proposed simple approach. It is indicated that correlation between the test result and the estimated life was good enough.