航空铆钉连接件的抗冲击性能

以分离式Hopkinson拉杆装置为基础，设计了特殊的铆接试验件，对MS20615铆钉的铆接结构开展了动态加载下不同加载角度、不同加载速率的力学性能试验。结合其准静态试验结果，获得了铆接结构在纯剪切、30°拉剪耦合、45°拉剪耦合、60°拉剪耦合和纯拉伸试验下的力学性能参数。试验结果表明，加载角度、加载速率对铆接结构的失效载荷与失效模式有显著的影响。在试验结果的基础上，使用有限元软件LS-Dyna建立了铆接结构的简化模型，对比了试验和数值模拟得到的铆接结构载荷-位移曲线，并对简化数值模型进行了网格相关性分析，验证了简化的铆钉单元模型的可行性。

Impact responses of aeronautic riveting structures

Using the split Hopkinson tensile bar device, a series of special riveting specimens for MS20615 rivet are designed, and the dynamic mechanical tests of riveting structures are performed under different loading angles and loading rates. In addition, the quasi-static mechanical properties of riveting structures are also obtained by conducting tests of the pure shear, 30°tension-shear coupling, 45°tension-shear coupling, 60°tension-shear coupling, and pure tension. Results show that the failure modes of riveting structures are significantly influenced by the loading angles and loading rates. Moreover, using the financial software LS-Dyna, the simplified finite element models (FE models) are established. The comparisons of force-displacement curves for the experiments and simulations are conducted to verify the feasibility of the simplified model. Meanwhile, the mesh correlation analysis is also performed as a supplementary verification.