XIE Beijing,CHEN Mingjin,CHEN Siyu,et al.Experimental Study on Dynamic Impact Failure Mechanical Properties of Ice Samples[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(06):1284-1290.
XIE Beijing,CHEN Mingjin,CHEN Siyu,et al.Experimental Study on Dynamic Impact Failure Mechanical Properties of Ice Samples[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(06):1284-1290. DOI: 10.13409/j.cnki.jdpme.20230207003.
Experimental Study on Dynamic Impact Failure Mechanical Properties of Ice Samples
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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