摘要
蜂窝夹层结构斜削区传力路径复杂且易出现脱粘损伤,此处一旦发生脱粘会直接改变传力路径,进而促使结构发生整体失效。本文引入cohesive界面单元,依据二次应力准则和基于能量的B-K准则来模拟斜削区胶层的损伤扩展,分析了在压缩载荷下蜂窝夹层结构斜削区的失效模式。采用实验测试Nomex纸蜂窝铝合金面板夹层结构在压缩载荷下斜削区的破坏模式及内外面板载荷分配情况。研究结果表明:仿真实验结果具有较好的一致性,应力最大区域为夹层结构实验件的4个斜削区,斜削区尖角处的胶层最先出现损伤,裂纹沿外面板与蜂窝粘接处扩展,胶层失效导致外面板局部刚度骤减,在压缩载荷下发生屈曲失效。此外进一步分析了蜂窝夹层结构的蜂窝性能、填料性能及曲率半径对内外面板应力分布的影响,为蜂窝夹层结构优化设计提供依据。
In the rampdown zone of the honeycomb sandwich structure,the load transfer path is complex,and the initial debonding damage easily occurs.The occurrence of the debonding will directly change the force transmission path and then promote the overall failure of the structure.The cohesive interface element is introduced to simulate the damage propagation of the adhesive layer under compression loads according to the quadratic nominal traction criterion and the energy-based B-K criterion.The failure mode of the Nomex honeycomb aluminum alloy panel sandwich structure and the load distribution of the inner and outer panels were experimented with by inplane compression load.Results show that the finite element calculation and experiment had a good consistency.The four corners of the rampdown zone were the maximum stress and the dangerous area.The adhesive layer at the sharp corner of the rampdown zone was damaged first,and the crack expanded along the bonding layer between the panel and the honeycomb.The adhesive layer debonding significantly decreased the local stiffness of the outer pane and prevented the outer plate′s yielding under the compression load.In addition,the influences of the honeycomb performance,the wadding performance,and the radius of the curvature on the stress distribution of inner and outer panels were analyzed.It provides a optincal design of honeycomb sandwich structure.
作者
韩刘
齐辉
门坤发
朱洪艳
宫少波
HAN Liu;QI Hui;MEN Kunfa;ZHU Hongyan;GONG Shaobo(College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China;AVIC Harbin Aircraft Industry Group CO., LTD, Harbin 150066, China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2022年第6期787-793,共7页
Journal of Harbin Engineering University
基金
中央高校基本科研业务费资助项目(3072020CFT0203).
关键词
夹层结构
斜削区
cohesive单元
分层
渐进失效
蜂窝性能
填料性能
曲率
sandwich structure
rampdown zone
cohesive element
debonding
progressive damage analysis
honeycomb performance
wadding performance
curvature
