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首页> 外文期刊>Journal of Materials Engineering and Performance >Comparative Study of Several Energy Dissipating Devices
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Comparative Study of Several Energy Dissipating Devices

机译：几种耗能装置的比较研究

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Large plastic lateral collapse problem of two geometrically identical hollow cylinders under compressive load is of particular interest in this work, since, the energy absorbed can be characterized by a smooth loaded deflection relation, and these tubes are also easier to build than most other devices. Cylinders of various geometrical parameters (i.e., inside/outside diameter ratios: R = di/do ranging from 0 to 0.473) are used having the same cross-sectional area and length. Superplastic material used in this study has a considerably sensitivity to the quasi-static strain rate in the range of (10~(-5) to 10~(-3)/s). Hence, this material could be employed as a representative material to simulate the classical engineering material behavior under high strain rate. Comparative study of different structural situations is conducted using four energy dissipating devices designed and investigated by the author in previous works. They are: (1) two geometrically identical cylinders made of superplastic tin-lead alloy can freely expand along their sides and lengths; (2) two cylinders are the same as in (1) but not allowed to expand along their sides and lengths; (3) one cylinder is made from superplastic and the other made from steel and free to deform along its sides and length; (4) the same as in (3) but the cylinder is not allowed to expand along its sides and length. Based on the obtained experimental results, the features of each device in dissipating the energy during the large plastic collapse are investigated. It is concluded that the energy absorbed for a given system decreases with the increase of the R ratio. It is recognized that the highest absorbed energy is obtained in the constrained situation with deformable non-deformable compared to the other situations. Moreover, through the finite element simulations, the flow mechanism in each device is studied and compared to the experimental results.
机译：在这项工作中，两个几何上相同的空心圆柱体在压缩载荷下的大型塑料横向塌陷问题特别引起关注，因为吸收的能量可以通过平滑的载荷偏转关系来表征，而且这些管也比大多数其他设备更易于制造。使用具有相同横截面积和长度的各种几何参数的气缸（即内/外径比：R = di / do在0到0.473之间）。本研究中使用的超塑性材料对准静态应变率具有相当大的敏感性，范围为（10〜（-5）至10〜（-3）/ s）。因此，该材料可用作代表性材料，以模拟高应变率下的经典工程材料行为。作者使用先前研究中设计和研究的四种消能装置对不同结构情况进行了比较研究。它们是：（1）两个由超塑性锡铅合金制成的几何形状相同的圆柱体可以沿其侧面和长度自由膨胀; （2）两个圆柱体与（1）相同，但不允许沿其侧面和长度膨胀; （3）一个圆柱体由超塑性制成，另一个圆柱体由钢制成，并沿其侧面和长度自由变形; （4）与（3）相同，但不允许圆柱体沿其侧面和长度扩展。根据获得的实验结果，研究了每个装置在大塑性塌陷过程中耗散能量的特性。结论是，给定系统吸收的能量随R比的增加而降低。公认的是，与其他情况相比，在可变形且不可变形的约束情况下获得了最高的吸收能量。此外，通过有限元模拟，研究了每个装置中的流动机理并将其与实验结果进行了比较。

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