改进V-型复合材料褶皱夹芯结构的制备及压缩性能

以改进V-型褶皱夹芯结构为研究对象，采用模压成型法制备出改进的V-型复合材料褶皱芯子，结合二次粘接工艺将复合材料层合板与褶皱芯子进行复合得到一种新型复合材料褶皱夹芯结构。利用数值模拟与试验相结合的方法，重点考察了该结构在平压载荷作用下的力学响应及其破坏机制。通过引进纤维压溃模型，对该结构的损伤演化过程进行了描述，数值模拟与试验获得的压缩应力-应变曲线吻合较好。实验研究发现，相对密度的变化不仅对该结构的力学性能产生影响，而且将直接导致该结构的破坏模式发生转变。

Preparation and compression performance of an improved V-type folded GFRP sandwich structure

A novel type of glass fiber reinforced polymer (GFRP) sandwich structure with an improved chevron folded core was obtained through hot-press molding method. The mechanical response and failure mechanism of this structure under compression loading were investigated with FEM simulation and experiment, the process of damage evolution were described with inducing the fiber crushing model, and the obtained stress-strain curves with simulation and experiment are fitted well. Results show that the variation of relative density of structure not only affects the mechanical performance, but also leads the fracture mode changing.