失效模式约束下层级褶皱结构的多目标优化

发布时间：2019-06-06 21:16

【摘要】：基于欧拉梁和弹性薄板理论,该文分析了二级层级褶皱结构的板模型在剪切或压缩载荷下对应的六种失效模式及对应的名义应力。通过比较名义应力值,控制发生的失效模式类型,并结合多目标优化算法,同时进行最小重量和最小挠度的性能优化。该文建立了两种优化模型:一是控制首次发生的失效模式类型;二是根据损失大小将失效模式分级,并按照等级序列发生。在此基础上,讨论了两种优化模型的Pareto前沿图中典型设计点的性能指标,最后采用有限元分析验证失效模式类型。结果表明:两种优化模型得到的结构设计,分别与控制发生的类型一致,综合性能得到极大提升;第二种模型考虑了应力值的差异,防止结构突然发生整体失效,更加安全。
[Abstract]:Based on the Euler beam and elastic thin plate theory, this paper analyzes six failure modes and the corresponding nominal stresses of the plate model of the second-order fold structure under shear or compression loads. By comparing the nominal stress values, the failure mode types are controlled, and the performance optimization of minimum weight and minimum deflection is carried out in combination with the multi-objective optimization algorithm. In this paper, two optimization models are established: one is to control the type of failure mode that occurs for the first time, and the other is to classify the failure mode according to the loss size and occur according to the grade sequence. On this basis, the performance indexes of typical design points in Pareto frontier diagram of two optimization models are discussed, and finally, the failure mode types are verified by finite element analysis. The results show that the structural design obtained by the two optimization models is consistent with the type of control occurrence, and the comprehensive performance is greatly improved. The second model takes into account the difference of stress value and prevents the structure from suddenly failing as a whole, which is safer.
【作者单位】：大连理工大学工程力学系工业装备结构分析国家重点实验室;北京机械设备研究所;南华大学城市建设学院;
【基金】：973项目(2014CB046506) 国家自然科学基金项目(11372061,11402049) 中国博士后科学基金项目(2015T80246)
【分类号】：O342

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