碳/玻璃纤维混编复合材料和钢板的单搭接接头的力学性能分析与预测

对碳/玻璃纤维混编纤维增强复合材料(FRP)和金属的粘接接头、铆接接头及粘铆混合连接接头的力学性能进行了系统的仿真和试验研究。分别使用内聚区损伤模型、金属失效准则和Hashin失效准则有效地模拟试验中胶层的脱粘失效、铆钉的断裂和FRP板的损伤。结合3种失效准则建立粘铆混合连接的有限元模型,并对其混合连接接头的拉伸力学性能进行预测。结果表明有限元模型准确地预测了混合连接试验的最大载荷、失效位移、失效形式和复杂失效过程的各个阶段。混编FRP在有胶层的接头的失效模式上表现出了特殊性,作为编织纱的玻璃纤维被撕脱。此外,基于以上模型研究了胶层厚度对混合连接接头力学性能的影响规律。随着胶层厚度增加,接头的最大载荷先增大后减小,FRP板铆钉孔周围的失效范围逐渐增大。

Analysis and prediction of the mechanical properties of the single-lap joints between carbon/glass fiber hybrid braided composite and steel plate

The mechanical properties of the bonded joints, riveted joints and hybrid joints between carbon/glass fiber reinforced polymer (FRP) and steel plate were systematically studied by simulation and experiment, in which cohesive zone damage model, metal failure criterion and Hashin failure criterion were employed to simulate the cohesive failure of adhesive layer, rivet rupture and FRP damage, respectively. On this basis, the finite element model of hybrid joints was established by combining the three failure criteria, and the mechanical properties of the hybrid joints during tensile tests were predicted. The results show that the finite element model can accurately predict the maximum load, failure displacement, failure modes and complex failure process of the hybrid joints tests. It is noticeable that the glass fiber as braided yarn is torn in the hybrid braided FRP for the joints with adhesive layer. Besides, the effect of the adhesive thickness on the mechanical properties of the hybrid joints was also studied. With the increase of the adhesive thickness, the maximum load of the joint increases first and then decreases, and the area of the damage zone around the rivet hole of FRP plate increases gradually.