冰试样动态冲击破坏力学特性实验研究
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解北京(1984—),男,副教授,博士。主要从事矿井瓦斯灾害防治、煤岩动力灾害防治等方面的研究。E-mail:bjxie1984@cumtb.edu.cn

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O383

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国家重点研发计划项目(2022YFC2904100,2019YFC0810800);国家自然科学青年基金项目(51404277)资助


Experimental Study on Dynamic Impact Failure Mechanical Properties of Ice Samples
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    摘要:

    为了进一步探究冰材质动态冲击破坏力学特性,通过分离式 Hopkinson压杆(SHPB)试验装置,采用快速加载、 杆端降温与波形整形技术,保证冰材质的稳定性并实现了加载过程中的动态应力平衡,分析了应变率、温度、长径比、 冻藏时间对冰力学特性与破坏模式的影响。结果表明:在 100 s-1 ~500 s-1 的应变率范围内,冰的动态单轴抗压强度与应变率呈现明显的正相关性;小长径比冰温度越低,抗压强度越大,且这种特性会受到应变率的影响;大长径比冰抗压强度随温度的下降而下降,这与体积大导致冰试样受冷不均,内部预应力增大有关;稳定无预应力冰,短冻藏时间会使其强度下降;温度、长径比对冰弹性模量影响明显,小长径比冰弹性模量随温度下降而增大,大长径比冰弹性模量随温度下降而减小;应变率是影响冰材质破坏模式的主要因素,随着应变率的上升,冰材质达到破坏时的轴向裂纹明显增加,形成的破碎产物尺寸明显变小。

    Abstract:

    In order to further explore the mechanical characteristics of the ice material under dynamic impact failure, the separation Hopkinson pressure bar (SHPB) test device was utilized to ensure the stability of the ice material and achieve dynamic stress balance during the loading process through rapid loading, bar end cooling and waveform shaping technology. The effects of strain rate, temperature, length-diameter ratio and frozen storage time on mechanical properties and failure modes of ice were investigated. The results show that the dynamic uniaxial compressive strength of ice is positively correlated with the strain rate in the range of 100 s-1 ~500 s-1 . For ice with a small length-to-diameter ratio, lower temperatures result in greater compressive strength, a trend significantly influenced by the strain rate. Conversely, the compressive strength of ice with large length-diameter ratio diminishes as temperatures decrease,, attributable to the uneven cooling of large-volume ice samples and increased internal prestress. The strength of stable and unprestressed ice decreases with short freezing time. Both temperature and length-diameter ratio markedly affect the elastic modulus of ice. The elastic modulus of ice with small length-diameter ratio increases with decreasing temperature, while it decreases for ice with a larger ratio under the same conditions. The strain rate is the main factor affecting the failure mode of the ice material. With the increase of the strain rate, axial cracks increase obviously when the ice material reaches failure, and the resulting fragments significantly reduce in size.

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解北京,陈铭进,陈思羽,栾铮,李晓旭,梁天宇.冰试样动态冲击破坏力学特性实验研究[J].防灾减灾工程学报,2023,43(6):1284-1290

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  • 收稿日期:2023-02-07
  • 最后修改日期:2023-03-22
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  • 在线发布日期:2024-01-11
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