Abstract
The effects of structural parameters on the forming quality and mechanical properties of CFRP (carbon fiber reinforced polymer)/Al (aluminum) self-piercing riveting (SPR) were investigated and optimized by combining experiment and numerical simulation. Firstly, the SPR 3D finite element model (FEM) was established, in which a continuous damage model (CDM) based on the strain-determined Hashin failure criterion was established to simulate the intra-layer damage of CFRP, and the inter-layer damage was simulated by using cohesive behavior. Subsequently, the effects of rivet length, die diameter, die depth, sheet thickness and width, rivet end distance, and CFRP layup sequence on the SPR cross-sectional dimensions (interlock, bottom remaining thickness) and shear results (peak shear load, energy absorption) were systematically investigated based on the established FEM. Finally, a multi-objective optimization of the structural parameter combinations was performed using Grey relational analysis (GRA) combined with entropy weight method. The results showed that the interlock increased with the increase of rivet length and die diameter, and decreased with the increase of die depth and sheet thickness. The peak shear load increased with the increase of sheet width and rivet end distance. The peak shear load of the joint with [0°/90°]3 s was the largest and the energy absorption of the joint with complex layups was the largest. Normally, the peak shear load and energy absorption were proportional to the interlock. The final optimized combination of joint parameters achieved significant improvement in each indicator compared with the original FEM.
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This work was supported by the National Natural Science Foundation of China (number 51975244).
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Dewen Kong: methodology, experiments, software, and paper writing. Dengfeng Wang: funding acquisition. Chong Xie: methodology and software. Shuang Wang: software. Xiaopeng Zhang: validation. Zifeng Zhang: experiments.
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Kong, D., Wang, D., Xie, C. et al. Investigation and optimization of structural parameters for the forming quality and mechanical properties of CFRP/Al self-piercing riveting. Int J Adv Manuf Technol 127, 3297–3313 (2023). https://doi.org/10.1007/s00170-023-11627-3
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DOI: https://doi.org/10.1007/s00170-023-11627-3