Multi-objective optimization design of CFRP-Al bonded structures under multiple working conditions considering tensile and bending loads

doi:10.19936/j.cnki.2096-8000.20250728.010

Abstract

Abstract: Due to the lack of systematic research on mechanical properties and damage behavior of the single lap bonded structures made of carbon fiber reinforced polymer composite (CFRP) and aluminum alloy (Al) under tensile and bending loads, the further improvement of the bonding properties and reliability is limited. In this study, the finite element model of CFRP-Al single lap bonded structure was established, and the mechanical response and damage distribution of the bonded structure under tensile load and three-point bending load were analyzed. Three-dimensional Hashin failure criterion and cohesive zone model were used to simulate the evolution process of intra-layer damage, interlayer damage and adhesive damage of CFRP, and the validity of the damage model was verified by comparison and analysis with experiments. Then, based on the bonding parameters, a multi-objective optimization proxy model with tensile strength, shear strength and bending strength as optimization objectives was constructed. The maximum relative error between the results of the proxy model and the simulation results was 2.57%, which verified the accuracy of the proxy model. On this basis, NSGA-Ⅱ algorithm was used to iteratively optimize the proxy model, and the three-dimensional distributed Pareto optimal solution set was obtained. Compared with the initial model, the optimized tensile strength, shear strength and bending strength of the bonded structure were increased by 7.34%, 24.12% and 9.51%, respectively, and the comprehensive connection performance of the bonded structure was effectively improved. This study provides a reference for reliability optimization design of bonded structures.

Key words: composite materials/aluminum alloy, bonded structure, tensile load, three point bending load, genetic algorithm, multi-objective optimization

CLC Number:

TB332

WU Wangjian, YOU Youpeng, ZHU Rupeng, WANG Dan. Multi-objective optimization design of CFRP-Al bonded structures under multiple working conditions considering tensile and bending loads[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(7): 79-90.

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