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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
投稿时间: 2017-06-09  最后修改时间: 2017-08-25
DOI:
中文关键词:  热源  红外热像法  非均匀变形  塑性失稳  疲劳
英文关键词:heat source  infrared thermography  heterogeneous deformation  plastic instability  fatigue
基金项目:国家高技术研究发展计划(863计划);国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
王晓钢 湖南大学机械与运载工程学院 xgwang@hnu.edu.cn 
摘要点击次数: 36
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中文摘要:
      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。本研究系统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材料力学问题展开研究,包括应力集中效应、塑性失稳现象以及金属疲劳,结果表明全场热源分析方法十分适用于对非均匀应变过程及疲劳损伤进行表征。
英文摘要:
      During the process of plastic deformation and fatigue of metallic materials it is always accompanied by energy dissipation. The magnitude and distribution of the dissipated energy allow not only reflecting the stress-strain state but also the damage level within the material. With the assistance of the infrared thermography technology, 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. The present research systematically introduces the full-field heat source analysis method based on experimental mechanics, and establishes the heat diffusion models from 2D to ‘0D’ in order to solve the inverse problem of calculating the heat sources from temperature fields. The developed method is then applied to study three typical problems in the mechanics of materials, including the stress concentration effect, plastic instability phenomenon and metal fatigue. The results demonstrate that the applied method is rather suitable for characterizing the heterogeneous deformation process and fatigue damage.
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