防灾减灾工程学报2023，Vol.43Issue(6)：1284-1290,7.DOI:10.13409/j.cnki.jdpme.20230207003
冰试样动态冲击破坏力学特性实验研究
Experimental Study on Dynamic Impact Failure Mechanical Properties of Ice Samples
摘要
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 rap-id 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 in-vestigated.The results show that the dynamic uniaxial compressive strength of ice is positively corre-lated with the strain rate in the range of 100 s-1～500 s-1.For ice with a small length-to-diameter ra-tio,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 de-creases 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.关键词
冰/SHPB/动态抗压强度/应变率/破坏模式Key words
ice/SHPB/dynamic compressive strength/strain rate/failure mode分类
数理科学引用本文复制引用
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):1284-1290,7.基金项目
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 （2022YFC2904100,2019YFC0810800）
