Computational prediction of fatigue crack paths in ship structural details
Computational prediction of fatigue crack paths in ship structural details
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DOI：
10.1111/j.1460-2695.2004.00850.x
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发表时间：
2005
影响因子：
3.7
通讯作者：
Y. Sumi;M. Mohri;Y. Kawamura
中科院分区：
文献类型：
--
作者：
Y. Sumi;M. Mohri;Y. Kawamura
本文研究了船体结构的疲劳裂纹扩展特性和剩余寿命评估问题，重点研究了焊缝、三维结构接头复杂应力分布和结构冗余等因素对裂纹扩展路径的影响。提出了一种用于弯曲裂纹扩展剩余寿命评估的先进数值模拟方法。模拟方法是基于一步一步的有限元分析。裂纹路径预测的摄动法与局部对称性准则，它给出了一个更高的阶近似的裂纹路径，而有限元重新分区进行了改进的铺路法。通过试验和数值模拟，研究了船体横桁焊接结构细节的疲劳裂纹路径。本方法可以提供一个有效的基于模拟的工具，设计的关键细节，这可以防止失败的板形成一个隔间边界。
The characteristics of fatigue crack propagation and the remaining life assessment of ship structures are investigated focusing attention on a curved crack path due to the effects of welds, complicated stress distributions at three-dimensional structural joints and structural redundancy. An advanced numerical simulation method is demonstrated for the remaining life assessment for curved crack propagation. The simulation method is based on a step-by-step finite-element analysis. The crack path is predicted by the perturbation method with the local symmetry criterion, which gives a higher order approximation of the crack path, while the finite-element re-zoning is carried out by an improved paving method. Fatigue crack paths in the welded structural details of the transverse girder of a ship structure are investigated by experiments and simulation. The present method may offer an efficient simulation-based tool for the design of critical details, which prevents the failure of the plates forming a compartment boundary.