薄面板复合材料蜂窝夹层结构冲击穿透试验与失效机理  

Impact Penetration Test and Failure Mechanism of Thin-facesheets Composite Honeycomb Sandwich Structure

作　　者：吕新颖[1] 刘龙权[1] 赵淑媛[2] LÜ Xin-ying;LIU Long-quan;ZHAO Shu-yuan(School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai 200240, China;National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, China)

机构地区：[1]上海交通大学航空航天学院,上海200240 [2]哈尔滨工业大学特种环境复合材料技术国家级重点实验室,哈尔滨150080

出　　处：《科学技术与工程》2021年第21期8834-8840,共7页Science Technology and Engineering

基　　金：特种环境复合材料技术国家级重点实验室基金(20GFA-ZF07-326)。

摘　　要：为研究薄面板复合材料蜂窝夹层结构冲击穿透损伤的失效机理,对具有3层平面编织复合材料面板的蜂窝夹层板试验件进行了多种能量的冲击试验。并在考虑了面板材料的渐进失效以及面内剪切非线性应力应变关系基础上,运用LS-DYNA有限元分析软件建立了夹层板的数值模型,用以分析失效过程。结果表明,数值模拟结果与试验结果一致。上面板穿透或整体贯穿时面板均呈花瓣状裂开,前者蜂窝以压溃损伤为主,后者则额外产生蜂窝芯体与下面板间的界面脱粘以及蜂窝壁的断裂损伤。无面板穿透时,冲击接触力将保持纤维断裂损伤阈值力大小直至冲头回弹;面板穿透则使冲击区域刚度下降,接触力随之下降,其中板整体贯穿时接触力会出现两个峰值。薄面板复合材料蜂窝夹层结构冲击穿透过程中的主要能量耗散在复合材料面板的纤维拉伸断裂,蜂窝的压溃和断裂过程也消耗部分能量。In order to investigate the perforation mechanism of honeycomb sandwich panels with thin composite face-sheets subjected to impact loading,experimental tests with different impact energies were carried out.Specimens with 3 plain woven plies were impacted with different values of impact energy.Numerical simulations were also carried out with the usage of LS-DYNA to analyze the failure process.The progressive failure and in-plane shear nonlinear stress-strain relationship of face-sheet were taken into consideration.The results show that the numerical results are compared well with experimental results.Face-sheet splits as petals.The honeycomb crush take place when the top face-sheet is perforated while the interfacial debonding between the honeycomb core and bottom face-sheet and the honeycomb fracture take place when the whole panel is perforated.The contact force will remain the threshold load of fiber fracture until impactor spring back without perforation occurring.Two wave crest emerge on the contact force curve when the whole panel perforated.The reason of face-sheet perforated is fiber fracture damage appearing in petal root.The tensile strength of face-sheet contribute a lot to the perforation resistance of sandwich panels.

关 键 词：复合材料 蜂窝夹层结构 冲击 穿透机理 数值模拟 

分 类 号：TB330.1[一般工业技术—材料科学与工程]