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采用真空导入成型工艺,制备出在面板与芯材界面上具有创新构型的点阵增强型复合材料夹层结构。对其面板拉伸性能、夹层结构剪切与平压性能进行了实验研究,得出点阵增强型复合材料夹层结构经树脂柱增强后,剪切与平压性能均得以提高的结论。对不同跨高比复合材料夹层结构开展了三点与四点弯曲实验,研究其典型受力破坏形态与机理。基于Eshelby等效夹杂原理,采用Mori-Tanaka方法求解了点阵增强型复合材料夹层结构经树脂柱增强后的剪切性能。利用经典夹层梁理论和非线性有限元模拟方法,预估了试件抗弯刚度与受弯极限承载力,理论分析与实验结果较吻合。
Using vacuum induction molding process, a lattice-enhanced composite sandwich structure with an innovative configuration at the interface between the panel and the core material was prepared. The tensile properties of the panel and the shearing and flattening properties of the sandwich structure were studied experimentally. The conclusion was obtained that both the shear and the flattening properties of the sandwich composite reinforced sandwich structure were enhanced by the resin column. Three-point and four-point bending experiments on different cross-ratio composite sandwich structures were carried out to study the typical failure modes and mechanism. Based on Eshelby’s principle of equivalent inclusions, Mori-Tanaka method was used to solve the shear behavior of the lattice reinforced composite sandwich structure reinforced by resin columns. The classical sandwich beam theory and nonlinear finite element simulation method are used to predict the flexural rigidity and ultimate bearing capacity of the specimens. The theoretical analysis and experimental results are in good agreement.