Study on main failure modes of multiple-holes structures based on branch-bound method

Q3 Engineering

西北工业大学学报 Pub Date : 2022-12-01 DOI:10.1051/jnwpu/20224061204

W. Xie, Yadan Zhang, Zehua Ma, Jinrong Feng, Yu Wu

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Abstract

Aiming at the typical five-hole structure on the aircraft skin, combined with the failure criterion of multi crack structure and considering the random factors affecting the residual life distribution of multiple crack structure, this paper applies the branch and bound algorithm to the screening of the main failure modes of typical five-hole structure, and gives the specific screening steps. The residual life of the structure is predicted by Franc3D crack propagation software, and the life interference model is established. Finally, the residual life distribution curve of the five-hole structure is formed to complete the screening of its main failure modes. The results show that the efficiency of using the algorithm to screen the main failure modes of the structure has been improved by 77.2%, and the error between the corresponding median life and that before screening is about 12%, indicating that the result of screening the main failure modes of the structure by the algorithm is more accurate. Compared with the existing test results, the median life predicted by the life distribution is more conservative and has certain reliability and accuracy. This method has certain reference significance for the evaluation of the safe life of this multi-holes structure.

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基于分支定界法的多孔结构主要失效模式研究

针对飞机蒙皮上典型的五孔结构，结合多裂纹结构的失效准则，考虑影响多裂纹结构剩余寿命分布的随机因素，将分支定界算法应用于典型五孔结构主要失效模式的筛选，并给出了具体的筛选步骤。利用Franc3D裂纹扩展软件预测了结构的剩余寿命，建立了寿命干涉模型。最后，形成五孔结构的剩余寿命分布曲线，完成其主要失效模式的筛选。结果表明，该算法对结构主要失效模式的筛选效率提高了77.2%，相应的中位寿命与筛选前的中位寿命误差约为12%，表明该算法对结构主要失效模式的筛选结果更为准确。与现有试验结果相比，寿命分布预测的中位寿命更为保守，具有一定的可靠性和准确性。该方法对该多孔结构的安全寿命评价具有一定的参考意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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