CFRP层合板单搭胶接接头胶板界面剥离强度仿真分析

doi:10.19936/j.cnki.2096-8000.20240128.010

摘要/Abstract

摘要： 基于异材界面奇异应力场理论,以CFRP层合板单搭胶接结构为对象,通过有限元和实验的方法分析了结构承载时板胶结合界面上出现的应力分布,锁定界面剥离强度关键区域,通过网格无关的有限元应力比值法提升仿真求解精度,最大限度还原板胶界面应力分布,着重探讨了多层各向异性CFRP板与传统均质材料在仿真过程和结果的差异,及搭接长度、胶层厚度、结构胶参数等对板胶界面应力分布及起裂点位置的影响,为板胶界面剥离应力的优化、胶接工艺的改进和单搭胶接接头强度的提升提供理论支撑。结果表明:各层参数不同的CFRP板胶界面承载时,剥离应力的最大处需由三个维度共同约束,其中两个维度的约束结果与均质材料相同,极值位于板胶界面垂直于拉伸方向的边缘,实际结构中失效的起始亦常见于此处,第三维度受层合板多层异性影响,该边缘上应力最大的点既不位于该边缘的中点也不位于界面角部,具体位置由材料参数和胶接结构共同影响。

关键词: 复合材料, 界面应力, 胶层, 单搭接接头, 有限元

Abstract: Focusing on adhesively bonded carbon fiber reinforced polymer (CFRP) single-lap structure, location and intensity of peeling stress on the plate/adhesive interface are mainly studied by finite element method (FEM) on the basis of intensity of singular stress field (ISSF). Simulation results are verified by comparing with experiments. Higher accuracy FEM results that close to real situation are obtained by applying mesh-independent finite element stress ratio method. The difference of simulation procedure and FEM results of CFRP and homogeneous material are compared. The influence of different bonding parameters on the plate/adhesive interface stress distribution of CFRP single-lap structure under tensile load are mainly studied. Applying these conclusions and characteristics in engineering practice can help optimize peeling stress, improve adhesive bonding technology and enhance the strength of single lap joint. The results show that when the CFRP plate/adhesive interface with different layer parameters is loaded, the location of maximum peeling stress should be constrained by three dimensions. The constraint results for two dimensions is the same as that of homogeneous materials, the extreme value is located at the edge of the plate/adhesive interface, which is perpendicular to the tensile direction. Failure initiation in actual structures is also common here. The third dimension that locates the dangerous point is affected by the multilayer anisotropy of the laminate and bonding parameters. The dangerous point with the maximum peeling stress on the edge is neither at the midpoint of the edge nor at the corner of the interface, the specific position is affected by material parameters and bonding structure.

Key words: composite material, interface stress, adhesive, single lap joint (SLJ), finite element method (FEM)

中图分类号:

TB332

张亚楠, 陈栋, 时建纬, 铁瑛, 李成. CFRP层合板单搭胶接接头胶板界面剥离强度仿真分析[J]. 复合材料科学与工程, 2024, 0(1): 74-82.

ZHANG Yanan, CHEN Dong, SHI Jianwei, TIE Ying, LI Cheng. Simulation analysis of interface peel strength of CFRP laminate single lap adhesive joint[J]. COMPOSITES SCIENCE AND ENGINEERING, 2024, 0(1): 74-82.

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