冲击荷载下砂岩的红外辐射特性  

Infrared radiation characteristics of sandstone exposed to impact loading

作　　者：周子龙[1] 刘洋 蔡鑫[1] 常银 高山 ZHOU Zilong;LIU Yang;CAI Xin;CHANG Yin;GAO Shan(School of Resources and Safety Engineering,Central South University,Changsha 410083,China;Center for Teaching and Learning Development,Central South University,Changsha 410083,China;Guangxi Xinfazhan Communications Group Co.Ltd.,Nanning 530029,China)

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083 [2]中南大学教师教学发展中心,湖南长沙410083 [3]广西新发展交通集团有限公司,广西南宁530029

出　　处：《中南大学学报（自然科学版）》2022年第7期2555-2562,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41772313);湖南省创新平台与人才计划项目(2019RS3001)。

摘　　要：为揭示岩石在冲击荷载下的红外辐射规律,采用分离式霍普金森压杆(SHPB)系统对砂岩在不同应变率下进行冲击测试试验,用红外热像仪监测和记录砂岩的红外热辐射信息。分析不同应变率下砂岩的红外热像演化特征以及加载过程中砂岩的平均红外辐射温度(t_(AIR))的变化规律,讨论平均红外辐射温度增量(Δt_(AIR))与应变率和试样能量密度的关系。研究结果表明:试样表面高温带与裂隙形成的位置对应关系较好,红外辐射强度变化越剧烈,试样破碎越严重;Δt_(AIR)随应变率增加而增加,两者呈幂函数关系;随着砂岩能量密度升高,Δt_(AIR)先缓慢增加再急剧增加,可用指数函数描述。To reveal the infrared radiation law of rock under impact loading,impact tests were performed on sandstone samples at different strain rates by using a split Hopkinson pressure bar,the infrared radiation information of sandstone samples was monitored and recorded by infrared thermography.The spital-temporal evolution characteristic’of thermograms at different strain rates and the variation features of average infrared radiation temperature(t_(AIR))of sandstone samples during dynamic loading were analyzed.The relationships between the increment ofΔtAIR and strain rate or absorbed energy were analyzed.The results show that the high temperature bands on sample surface correspond well to the position of fracturing.The stronger the infrared radiation,the more severe the fracturing.Δt_(AIR) increases with the increase of strain rate in a power function manner.With the increase of energy density of sandstone,Δt_(AIR) increases slowly and then increases dramatically,which can be described by an exponential model.

关 键 词：红外热辐射温度 砂岩 SHPB 应变率 能量密度 

分 类 号：TU452[建筑科学—岩土工程]