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通过试验结合有限元方法,针对蜂窝夹芯结构的无损件和三种冲击损伤件开展了单轴压缩载荷下的失效模式研究,同时考虑了胶层性能与损伤尺寸的影响。研究结果表明:试验和有限元方法得到的损伤模式及起始损伤位置相同;不同冲击损伤位置可导致结构的整体承载能力不同,下降的范围为10%-20%。其中:损伤位于顶面区时承载能力下降最为严重,损伤位于边缘区时承载能力下降最少;面芯界面胶层性能的不同会使结构材料破坏顺序改变,胶层断裂能较低时夹芯结构由蜂窝芯破坏向层间破坏转变;冲击能量不同引起结构损伤程度不同,随着损伤深度的增加,结构破坏的危险位置由中心转向边缘。
Through the test combined with the finite element method, the failure mode under uniaxial compressive load was studied for the non-destructive parts of honeycomb sandwich structure and the three kinds of impact damage parts, and the influence of the performance and damage size of the adhesive layer was considered. The results show that the damage modes and initial damage locations obtained by the test and the finite element method are the same. Different locations of impact damage can lead to different overall bearing capacity of the structure, with a range of 10% -20%. Among them, when the damage is located in the top zone, the bearing capacity decreases the most seriously, and the bearing capacity decreases the least when the damage is located in the edge zone. The difference of the surface layer-core adhesive layer properties will lead to the change of structural material failure sequence, From the destruction of honeycomb core to the interlaminar failure. The impact damage caused by the different impact energy is different. With the increase of damage depth, the dangerous position of structural damage is turned from the center to the edge.