全场热源分析方法及其在实验固体力学研究中的应用  

Full-field heat source analysis method and its applications in experimental solid mechanics

作　　者：冯恩升 王晓钢[1] 姜潮[1] 王从思[2] FENG En-sheng;WANG Xiao-gang;JIANG Chao;WANG Cong-si(State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China;Key Laboratory of Electronic Equipment Structure Design of Ministry of Education,Xidian University,Xi'an 710071,China)

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,长沙410082 [2]西安电子科技大学电子装备结构设计教育部重点实验室,西安710071

出　　处：《实验力学》2019年第1期95-104,共10页Journal of Experimental Mechanics

基　　金：国家自然科学基金(编号:51605153);电子装备结构设计教育部重点实验室开放基金(编号:EESD-OF-201502)资助项目

摘　　要：金属材料在塑性变形及疲劳过程中均伴随着能量的耗散,耗散能的大小与分布可充分反映材料内部的应力应变状态与损伤程度。全场热源分析方法借助于红外热成像技术,通过建立合适的热传导模型将由实验获取的温度场转化为热源信息,进而实现对耗散能的估值。本文介绍了基于实验力学的全场热源分析方法,建立从二维到"零维"的热传导模型,解决由温度场到热源的计算反求问题;然后利用该方法针对三种典型的固体力学问题展开研究,包括应力集中效应、塑性失稳现象以及疲劳问题。研究结果表明,全场热源分析方法可有效表征非均匀变形过程及疲劳损伤。During plastic deformation and fatigue process of metallic materials,it is always accompanied by energy dissipation.The magnitude and the distribution of dissipated energy allow not only adequately reflecting the stress-strain state but also the damage level within material.With the assistance of infrared thermal imaging method,the full-field heat source analysis method can be used to convert the temperature field obtained by experiment into heat source information via establishing appropriate heat diffusion models,and then the dissipated energy can be estimated.In this paper, authors systematically introduce the full-field heat source analysis method based on experimental mechanics,and establish the heat diffusion models from 2D to "OD"in order to solve the problem of inversely calculating the heat sources from temperature field.The developed method is then applied to study three typical problems in solid mechanics,including stress concentration effect,plastic instability phenomenon and metal fatigue.Study results demonstrate that the full-field heat source analysis method is rather suitable for characterizing the heterogeneous deformation process and fatigue damage.

关 键 词：热源 红外热像法 非均匀变形 塑性失稳 疲劳 

分 类 号：TB125[理学—工程力学]