Simulation analysis of interface peel strength of CFRP laminate single lap adhesive joint

doi:10.19936/j.cnki.2096-8000.20240128.010

Abstract

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)

CLC Number:

TB332

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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