带衬套复合材料螺栓连接力学性能

Mechanical properties of composite bolt connections with sleeve

  • 摘要: 对带衬套和不带衬套的玻璃纤维复合材料圆头螺栓连接件进行了拉伸试验,获得了试件的位移-载荷曲线及失效模式,研究了复合材料螺栓连接性能。在Chang–Lessard准则基础上考虑了面外的失效形式编写了相应损伤程序,基于ABAQUS对复合材料层合板螺栓连接件进行了强度计算及渐进损伤分析。结果表明,利用UMAT损伤子程序可以准确地预测破坏载荷以及模拟层合板失效模式;衬套的引入能够提高层合板的极限破坏载荷,本文中A-1 (带衬套)与A-3组(不带衬套)相比提高了21.5%,A-2(带衬套)与A-4组(不带衬套)相比提高了13.1%;过盈量的增加使得层合板刚度变大,但对破坏载荷影响不大。

     

    Abstract: Tensile tests were carried out on glass fiber composite round head bolt connections with and without sleeves. The load-displacement curves and failure mode of specimens were obtained, and the performance of composite bolt connections was studied. Based on the Chang–Lessard criterion, the corresponding damage program was written considering the out-of-plane failure mode. The strength calculation and progressive damage analysis of composite laminate bolt connections were carried out based on ABAQUS. The results show that the UMAT damage subroutine can accurately predict the failure load and simulate the laminate failure mode. The introduction of the sleeves can improve the ultimate failure load of laminates. In this paper, the A-1 group (with sleeve) is increased by 21.5% compared with A-3 group (without sleeve), and the A-2 group (with sleeve) is increased by 13.1% compared with A-4 group (without sleeve). Increasing the interference can improve the laminate stiffness, but has little effect on the failure load.

     

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