Multiscale fatigue crack growth modelling for welded stiffened panels
Multiscale fatigue crack growth modelling for welded stiffened panels
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DOI：
10.1111/ffe.12189
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发表时间：
2014-09
影响因子：
3.7
通讯作者：
Ž. Božić;S. Schmauder;M. Mlikota;M. Hummel
中科院分区：
文献类型：
--
作者：
Ž. Božić;S. Schmauder;M. Mlikota;M. Hummel
研究了加筋板焊接残余应力对有效应力强度因子和疲劳裂纹扩展速率的影响。不同的长度尺度，如位错外观和微观结构裂纹的成核和传播的相关影响的解释考虑到使用分子动力学模拟以及Tanaka-Mura的方法分析的问题。采用壳单元和裂纹尖端位移外推技术，通过有限元法计算了I型应力强度因子KI。总应力强度因子值Ktot由施加载荷Kappl和焊接残余应力Kres的部分得出。基于幂律模型的疲劳裂纹扩展模拟结果表明，加筋板附近的高拉伸残余应力显著增加了裂纹扩展速率，这与实验结果吻合较好。
The influence of welding residual stresses in stiffened panels on effective stress intensity factor (SIF) values and fatigue crack growth rate is studied in this paper. Interpretation of relevant effects on different length scales such as dislocation appearance and microstruc- tural crack nucleation and propagation is taken into account using molecular dynamics simulations as well as a Tanaka-Mura approach for the analysis of the problem. Mode I SIFs, KI, were calculated by the finite element method using shell elements and the crack tip displacement extrapolation technique. The total SIF value, Ktot, is derived by a part due to the applied load, Kappl, and by a part due to welding residual stresses, Kres. Fatigue crack propagation simulations based on power law models showed that high tensile residual stresses in the vicinity of a stiffener significantly increase the crack growth rate, which is in good agreement with experimental results.