高温环境下含典型凹坑缺陷蜂窝夹芯板特征值屈曲性能

蜂窝夹芯板在运输、使用过程中,可能在面板上产生形式各异的凹坑,研究高温环境下含凹坑缺陷蜂窝夹芯板的屈曲性能对评估结构安全和可重复使用具有重要意义。基于Python语言构建了含圆形凹坑缺陷、含正方形凹坑缺陷、含正三角形凹坑缺陷蜂窝夹芯板参数化有限元模型,分析了恒温和变温下凹坑缺陷关键参数对蜂窝夹芯板特征值屈曲性能影响规律,结果表明不管是恒温环境还是变温环境,随着凹坑缺陷直径(边长)或者凹坑深度的增大,蜂窝夹芯板临界失稳载荷降低；对比分析了等面积缺陷和等周长缺陷下三种典型缺陷对结构特征值屈曲性能的影响,结果表明等面积缺陷下,含圆形凹坑缺陷蜂窝夹芯板的临界失稳载荷略大于其余两者,等周长缺陷下,含正三角形凹坑缺陷蜂窝夹芯板的临界失稳载荷略大于其余两者。

Eigenvalue buckling performance analysis of honeycomb sandwich panel with typical pit defects in high temperature environment

Pits of various forms may generate in the panel of honeycomb sandwich panel, and it is significant to study the eigenvalue buckling performance of the honeycomb sandwich panel with typical pit defects when evaluating the safety and reusability of the structure. Three kinds of parametric finite element model for honeycomb sandwich panel with pit defects were built, namely circular pit, quadrate pit, and equilateral pit. Influence of key parameters on the eigenvalue buckling performance of the honeycomb sandwich panel was analyzed under both constant temperature and variable temperature environment. The result shows that accompanied with the increasing of diameter or length of the pit defect, the critical buckling load increases under both the two temperatures environment. By using contrastive analysis method, the influence of the three kinds of pit defects on the structure was obtained when the pit defects have the same area or the same perimeter. When the pit defects have the same area, the structure with circular pit has the largest critical buckling load and when the pit defects have the same perimeter, the structure with equilateral pit has largest critical buckling load, and both the differences among them are negligible.