Self-locked energy-absorbing systems have been proposed in previous studies to overcome the limitations associated with the round-tube systems because they can prevent the lateral splash of tubes from impact loadings without any constraints. In case of self-locked systems, the ellipse-shaped self-locked tube is considered to be an optimal design when compared with the ordinary circle-shaped self-locked tubes and other shaped self-locked tubes. In this study, we aim to theoretically analyze the ellipse-shaped self-locked tubes. Further, a plastic hinge model is developed to predict the force-displacement relation of the tube, which is compared with the deformation process observed in the experiment and finite element method (FEM) simulation. Using this model, the effects of tuning the geometric parameters of the tube on the energy absorption performance, including the deformation efficiency, energy absorption capacity, and effective stroke ratio, are simulated and analyzed. Finally, a guideline is provided with respect to the design of the ellipse-shaped self-locked tube in engineering applications.

中文翻译：

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椭圆形自锁管能量吸收的理论研究

在以前的研究中已经提出了自锁式能量吸收系统，以克服与圆管系统相关的限制，因为它们可以防止无任何约束的冲击载荷引起管子的横向飞溅。在自锁系统的情况下，与普通的圆形自锁管和其他形状的自锁管相比，椭圆形的自锁管被认为是最佳设计。在这项研究中，我们旨在从理论上分析椭圆形的自锁管。此外，开发了一种塑料铰链模型来预测管的力-位移关系，并将其与实验和有限元方法（FEM）模拟中观察到的变形过程进行比较。使用这个模型，模拟和分析了调整管的几何参数对能量吸收性能的影响，包括变形效率，能量吸收能力和有效冲程比。最后，提供了有关工程应用中椭圆形自锁管设计的指南。