蜂窝夹层结构及其埋件的力学性能研究

Mechanical Performances of Honeycomb Sandwich Structure and Inserts

对蜂窝夹层结构及其侧向和板内M5埋件力学性能进行了研究,分析了蒙皮厚度、胶黏剂面密度和胶接强度对力学性能的影响。结果表明,适当增加蒙皮厚度,有利于提高蜂窝夹层结构及其埋件的力学性能;在同等胶接强度下,胶黏剂面密度对力学性能的影响可以忽略,可选用面密度较低的胶黏剂来降低结构质量;埋件系统承受面内剪切载荷的能力明显优于其承受垂直于蒙皮的面外拉拔载荷能力;承受面内剪切载荷时,埋件系统的失效模式以埋件区域蒙皮局部破坏为主;承受面外拉拔载荷时,埋件周围蜂窝芯先失稳破坏,并最终导致埋件带动蒙皮变形、局部发生破坏。所得结果可为结构设计优化提供参考。

The mechanical performances of honeycomb sandwich structure and M5 inserts were tested.Results were discussed and the effects of panel thickness,areal density of adhesive and bonding strength on the mechanical performances were analyzed.It was found that properly increasing the panel thickness was effective to improve the mechanical performances of honeycomb sandwich structure and inserts.On conditions of the same bonding strength,mechanical performance was not affected by areal density of adhesive,therefore adhesive with lower areal density should be chosen to reduce weight.The in-plane shear carrying load capacity of inserts was better than the normal pull-out load carrying capacity.While under in-plane shear load,the failure mode of inserts was panel failure.While under normal pull-out load,the failure mode of inserts was honeycomb instability failure which finally caused panel deformed and destroyed at last.The conclusions can be used in product design.