The shear pin structure is widely used in aeronautics and astronautics structures to deal with emergency structure separation problems. The shear pin design has a strict restriction on the precise failure load and definite failure mode. Previous research has conducted shear fracture tests and simulations of solid shear pins while there is a lack of detailed research on the shear fracture of hollow shear pins with large diameters. In this research, a 3-dimensional finite element model was built based on the actual shear pin installed on the aircraft engine pylon and the model was validated by the experiment. The influences of the inner diameter of hollow shear pins on the shear fracture process were investigated by conducting finite element simulations. The structural deformation, energy dissipation in the fracture process, and failure load of shear pins were evaluated. It is found that as the inner diameter increases, the failure mode of shear pins changed and would result in difficulties on the structure separation. To solve this problem, a new configuration of hollow shear pin was proposed for the purpose of obtaining both desired failure load and failure mode. The new configuration was verified by the fracture simulation and it is found that the new configuration is effective and can be used to improve the shear fracture performance.

中文翻译：

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空心剪切销动态剪切断裂的有限元模拟

剪力销结构广泛应用于航空航天结构中，以应对紧急结构分离问题。剪力销设计对精确的破坏载荷和明确的破坏模式有严格的限制。以往的研究已经对实心剪切销进行了剪切断裂试验和模拟，而对大直径空心剪切销的剪切断裂缺乏详细研究。本研究以飞机发动机挂架上安装的实际剪力销为基础，建立了三维有限元模型，并通过实验对模型进行了验证。通过有限元模拟研究了空心剪切销内径对剪切断裂过程的影响。断裂过程中的结构变形、能量耗散、并评估了剪切销的失效载荷。结果表明，随着内径的增加，剪切销的破坏模式发生变化，导致结构分离困难。为了解决这个问题，为了获得所需的破坏载荷和破坏模式，提出了一种新的空心剪力销结构。通过断裂模拟验证了新配置，发现新配置是有效的，可用于提高剪切断裂性能。