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首页> 外文期刊>International Journal of Solids and Structures >High strain-rate behavior of ice under uniaxial compression
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High strain-rate behavior of ice under uniaxial compression

机译：单轴压缩下冰的高应变率行为

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In the present study, a modified split Hopkinson pressure bar (SHPB) is employed to investigate the dynamic response of ice under uniaxial compression in the range of strain rates from 60 to 1400 s-1 and at initial test temperatures of -10 and -30 °C. The compressive strength of ice shows positive strain-rate sensitivity over the range of strain rates employed: a slight influence of ice microstructure is observed, but it is much less than that reported previously for ice deformation under quasi-static loading conditions [Schulson, E.M., lliescu, D., Frott, A., 2005. Characterization of ice for return-to-flight of the space shuttle. Part 1 - Hard ice. NASA CR-2005-213643-Part 1 ]. Specimen thickness, within the range studied, was found to have little or no effect on the peak (failure) strength of ice, while lowering the test temperature from -10 to -30 °C had a considerable effect, with ice behaving stronger at the lower test temperature. Moreover, unlike in the case of uniaxial quasi-static compression of ice, the effect of specimen end-constraint during the high rate compression was found to be negligible. One important result of these experiments, which may have important implications in modeling ice impacts, involves the post "peak-stress" behavior of the ice in that the ice samples do not catastrophically lose their load carrying capacity even after the attainment of peak stress during dynamic compression. This residual (tail) strength of the damaged/fragmented ice is sizable, and in some cases is larger than the quasi-static com_pression strength reported for ice. Moreover, this residual strength is observed to be dependent on sample thickness and the strain rate, being higher for thinner samples and at higher strain-rates during dynamic compression.
机译：在本研究中，采用改进的霍普金森分裂压力棒（SHPB）来研究冰在单轴压缩下的动态响应，应变速率为60至1400 s-1，初始测试温度为-10和-30 ℃。冰的抗压强度在所采用的应变速率范围内显示出正的应变速率敏感性：观察到冰微结构的轻微影响，但远小于先前报道的准静态载荷条件下冰变形的影响[Schulson，EM ，利利斯库，D。，弗罗特，A.，2005年。《航天飞机返回飞行的冰的特征》。第1部分-硬冰。 NASA CR-2005-213643-Part 1]。在所研究的范围内，发现样品厚度对冰的峰（破坏）强度影响很小或没有影响，而将测试温度从-10°C降低到-30°C则有相当大的影响，而冰的温度在较低的测试温度。此外，与单轴准静态压缩的情况不同，在高速压缩过程中试样末端约束的影响被忽略。这些实验的一个重要结果可能对冰的影响建模具有重要意义，涉及冰的后“峰值应力”行为，因为即使在达到峰值应力后，冰样品也不会灾难性地失去其承载能力动态压缩。破损/碎冰的残余（尾部）强度是相当大的，在某些情况下大于报道的准静态压缩强度。此外，观察到该残余强度取决于样品厚度和应变速率，对于较薄的样品较高，并且在动态压缩过程中较高的应变速率。

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