光弹材料应力与红外辐射关系的实验验证  

Experimental Verification of the Relationship Between Stresses and Infrared Radiation of Photoelastic Materials

作　　者：单奕铭 程涛[2] 李英骏[2] SHAN Yiming;CHENG Tao;LI Yingjun(College of Resources&Safety Engineering,China University of Mining&Technology,Beijing 100083,China;State Key Laboratory for GeoMechanics and Deep Underground Engineering,China University of Mining&Technology,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083 [2]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083

出　　处：《红外技术》2018年第7期673-678,共6页Infrared Technology

基　　金：国家自然科学基金项目(41572334;51208505);煤炭资源与安全开采国家重点实验室基金项目(SKLCRSM16KFB03)

摘　　要：为了探究加载试件中的应力值大小与其红外辐射的关系,通过在相同实验条件下对环氧树脂三点弯曲梁分别进行了光弹性成像实验及红外辐射成像探测,并分别计算和读出光弹性实验等差线图和红外图像相同点处的应力值和灰度值。通过对实验数据的分析和比较,发现试件各研究点处的应力值与红外灰度值之间具有线性关系,应力值与等差线条纹级数之间也具有线性关系,这揭示了红外图像是可以准确反应出应力值,即人们可以利用红外来直接测量应力大小。虽然光弹和红外都可给出应力的场图,但因光弹只能用于测量透明材料,而红外的测量是不受待测材料是否为透明所影响的,这为工程中利用红外来直接测量岩石、混凝土等非透明材料中的应力分布提供了可能。In order to investigate the relationship between the stress and infrared radiation in solid materials exerted to loading,an experiment was carried out using epoxy resin specimens.A photoelastic image and an infrared radiation image were obtained,based on which stress was calculated.A linear relationship between the stress value and the infrared radiation value was observed.Our results may provide a new method of stress measurement.Although the stress field can be obtained by both photoelastic and infrared measurements,the former can only be used in measuring transparent materials,while the latter can be used for any materials,including rock and concrete.Such advantages of the infrared measurement may provide a novel method to obtain stress distribution.

关 键 词：光弹性实验 光弹材料 红外辐射特征 红外应力测量 定量描述 

分 类 号：O348.1[理学—固体力学]