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Experimental studies on crack propagation and accumulative mean strain of cracked stiffened plates under low-cycle fatigue loads
Ocean Engineering ( IF 5 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.oceaneng.2020.107744
Wei Jiang , Ping Yang

Abstract In this work, the effects of low-cycle fatigue loading and stiffener height on crack propagation regularities of stiffened plates are investigated. The tests are conducted on 14 cracked stiffened plate specimens using an MTS322 fatigue tester. Videos showing the crack propagation are recorded using two electron microscopes, and the data form which are used to plot the a-N curves. The accumulative mean strain curves are obtained from the displacement data of the loading rod. The a-N curves show that during the entire low-cycle fatigue loading, the stiffener constrains the crack propagation, causing the crack propagation length of the stiffener to be greater than that of the plate. Additionally, the accumulative mean strain, which has a maximum value of about 1.62%, is observed in the specimen and is unrecoverable. The data presented in this work may be useful for a more accurate calculation of time-dependent change of the ultimate strength of specimens under low-cycle fatigue loads.

中文翻译:

低周疲劳载荷下开裂加筋板裂纹扩展及累积平均应变试验研究

摘要 在这项工作中,研究了低周疲劳载荷和加强筋高度对加强板裂纹扩展规律的影响。使用 MTS322 疲劳试验机对 14 个开裂加筋板试样进行测试。使用两个电子显微镜记录显示裂纹扩展的视频,以及用于绘制 aN 曲线的数据表格。累积平均应变曲线是从加载杆的位移数据中获得的。aN曲线表明,在整个低周疲劳加载过程中,加强筋约束裂纹扩展,导致加强筋的裂纹扩展长度大于板的裂纹扩展长度。此外,在试样中观察到累积平均应变,其最大值约为 1.62%,并且无法恢复。
更新日期:2020-10-01
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