Failure analysis and size optimization of CFRP composite single-lap bonded joints based on the influence of multiple parameters

作者：Kang Yang, Ziyi Liu, Xin Qi, Pengyang Li, Shude Ji, Peng Liu, Zhipeng Liu · 发表于：Scientific Reports · 年份：2024 · DOI：10.1038/s41598-024-83605-y · 被引用次数：12 · 研究领域：Mechanical Behavior of Composites、Structural Behavior of Reinforced Concrete、Fatigue and fracture mechanics

This paper had conducted tensile shear tests on single-lap joints (SLJs)bonded structures of carbon fiber reinforced resin matrix (CFRP) composite laminates with different overlap lengths, overlap widths, overlap model, adherend material, and adhesive layer thicknesses under two environments: room temperature dry state (RTD) and elevated temperature wet state (ETW). The failure modes were observed, and load-displacement curves were obtained. The microscopic morphology of the fracture surface was observed by scanning electron microscope (SEM). At the same time, a finite element simulation model was established to simulate the damage initiation and evolution process between layers and in the adhesive layer, and analyze the distribution laws of peel stress and shear stress in the adhesive layer. Through the combination of test data and simulation results, the influences of geometric parameters, material parameters and environmental parameters on the structure were explored, and the joint failure mechanism was revealed. Finally, the ACO-BP neural network was used to optimize the geometric parameters through test data. The research results showed that the geometric parameters of the structure mainly affect the bearing capacity and failure type. Reducing the overlap length and increasing the overlap width within a certain range can weaken the peeling phenomenon, so that a smaller overlap area has a higher shear strength. The material parameters of the adherend mainly affect the str...