单向拉伸荷载下含缺陷PVC板的弹性变形降温分析  

Temperature reduction analysis of pre-cracked PVC sheet in elastic deformation under a tension load

作　　者：陈胜铭[1] 罗迎社[1] 杨占宇[1] 

机构地区：[1]中南林业科技大学流变力学与材料工程研究所,湖南长沙410004

出　　处：《中南林业科技大学学报》2010年第11期136-139,共4页Journal of Central South University of Forestry & Technology

基　　金：国家自然科学基金项目(10672191;11072270);湖南省自科基金重点项目(06JJ2059);教育部重点实验室项目(KF0607);中南林业科技大学青年基金项目(2008050B)

摘　　要：含预制缺陷的聚氯乙烯(PVC)薄板在单向拉伸荷载作用下损伤断裂过程中,采用红外热像技术获得试件全域表面温度场及其随时间演变的全部信息,采用能量密度理论和分子取向理论,对过程中的弹性变形降温现象做出理论解释,结果表明符合实际情况。In the process of fracture and damage of a polyvinyl chloride（PVC） sheet with pre-crack under a tension load,the infrared thermographs on specimen surface and its development with time was recorded by a Thermal Infrared Imager.The energy density theory and the molecular orientation theory were employed to analyze the temperature reduction phenomenon of specimen in elastic deforming.The results indicate that the temperature reduction occurred within elastic deformation period and reached the maximum in critical stage of elastic to plastic deformation.

关 键 词：一般力学 聚氯乙烯板 能量密度理论 分子取向理论 弹性降温现象 

分 类 号：O31[理学—一般力学与力学基础]