ABSTRACT

The work deals with an experimental and numerical assessment of crack growth in a welded stiffened panel subjected to a cyclic load of a sine shape. A stiffened panel with one central stiffener is manufactured for testing cracks simultaneously propagating in the plate and web. The unified fatigue growth rate equation proposed by Cui et al. 2011 Cui WC, Wang F, Huang XP. 2011. A unified fatigue life prediction method for marine structures. Mar Struct. 24(2):153–181. doi: https://doi.org/10.1016/j.marstruc.2011.02.007[Crossref], [Web of Science ®] , [Google Scholar] is employed in the analysis of the crack growth. The stress range intensity factor is calculated by employing the finite element method using finite singularity elements. The crack growth rate for both plate and web of the stiffened panel is statistically analysed based on the testing results using the one-sided tolerance method. It has been shown that the crack growth rate in the plate is faster than the one in the web of the stiffened panel and a high correlation in the crack propagation in the plate and stiffener exist.

摘要

这项工作涉及对承受正弦形状循环载荷的焊接加筋板中裂纹扩展的实验和数值评估。制造带有一个中央加劲肋的加筋板，用于测试同时在板和腹板上传播的裂缝。崔等人提出的统一疲劳增长率方程。2011年 崔WC，王˚F，黄XP。 2011 年。海洋结构物的统一疲劳寿命预测方法。马尔结构。24（2）：153 – 181。doi：https: //doi.org/10.1016/j.marstruc.2011.02.007 [Crossref]、[Web of Science®]  、[Google Scholar]用于裂纹扩展分析。应力范围强度因子是通过使用有限奇异元素的有限元方法来计算的。根据试验结果，采用单面容差法对加筋板的板和腹板的裂纹扩展速率进行统计分析。已经表明，板中的裂纹扩展速率比加筋板腹板中的快，并且板和加强筋中裂纹扩展存在高度相关性。