• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2021, Vol. 57 ›› Issue (10): 187-195.doi: 10.3901/JME.2021.10.187

• 材料科学与工程 • 上一篇    下一篇

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对流和辐射换热对金属高周疲劳能量耗散估计的影响

杨文平1,2, 郭杏林1,2, 赵延广1,2   

  1. 1. 大连理工大学工业装备结构分析国家重点实验室 大连 116024;
    2. 大连理工大学工程力学系 大连 116024
  • 收稿日期:2020-07-01 修回日期:2020-12-23 出版日期:2021-05-20 发布日期:2021-07-23
  • 通讯作者: 赵延广(通信作者),男,1981年出生,博士,高级工程师。主要研究方向为疲劳、断裂及损伤容限性能测试与分析。E-mail:ygzhao81@dlut.edu.cn
  • 作者简介:杨文平,男,1990年出生,博士研究生。主要研究方向为结构损伤识别技术与应用。E-mail:237543581@qq.com;郭杏林,男,1955年出生,博士,教授,博士研究生导师。主要研究方向为结构动态载荷识别的方法与应用、结构模态分析与应用、结构损伤识别方法与应用、材料与结构可靠性分析。E-mail:xlguo@dlut.edu.cn
  • 基金资助:
    大连理工大学工业装备结构分析实验室开放课题资助项目(GZ19107)。

Effects of Convection and Radiation Heat Transfer on Energy Dissipation Estimation of Metal in High-cycle Fatigue

YANG Wenping1,2, GUO Xinglin1,2, ZHAO Yanguang1,2   

  1. 1. State Key Laboratory of Structure Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024;
    2. Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024
  • Received:2020-07-01 Revised:2020-12-23 Online:2021-05-20 Published:2021-07-23

摘要: 疲劳断裂是引起工程结构和构件失效的主要原因。传统疲劳性能预测方法存在周期长和经济成本高等缺点,基于红外热像法的金属高周疲劳性能快速评估受到广泛关注。在金属高周疲劳试验中,引起试样温升的不可逆能量耗散作为红外热像法中的关键指标,其估计值的精度决定了疲劳性能评估的准确性。基于红外热像法提出一种金属高周疲劳过程中的能量耗散估计方法,根据传热学理论引入自然对流和辐射热阻,并通过数值模拟和试验来验证方法的正确性和精度。研究发现,在高周疲劳试验过程中进行能量耗散估计时,自然对流和辐射造成的热损失占比较大,均不可直接忽略。与文献中同样考虑了对流和辐射效应的温降方法进行对比发现,温降方法适用于局部能量耗散的估计,且对时间非常敏感,估计结果不够稳定;而所提方法更适用于光滑平板试样的疲劳试验,且流程简单,结果稳定可靠,便于工程实际中的应用。

关键词: 红外热像法, 能量耗散, 高周疲劳, 对流和辐射换热

Abstract: Fatigue fracture is the main reason of failure for engineering structures and components. Due to the disadvantages of traditional fatigue prediction methods, such as long cycle and high economic cost, the rapid evaluation of high cycle fatigue performance of metals based on infrared thermography has attracted wide attention. During the high-cycle fatigue experiments of metal materials, the irreversible energy dissipation which causes the temperature rise of the sample is taken as a key index in the infrared thermography method, and the accuracy of the estimated dissipation determines the precision of the fatigue performance evaluation. A high-cycle fatigue energy dissipation estimation method is proposed based on infrared thermography, and a natural convection and radiation heat resistance is introduced according to the heat transfer theory. The correctness and precision of the present method are verified through the numerical simulation and experimental procedure. It is found that the heat loss caused by natural convection and radiation cannot be directly ignored when energy dissipation is estimated in high-cycle fatigue experiments. The present method is compared with the temperature drop method which also considered convection and radiation effects. The results show that the temperature drop method is suitable for the estimation of local energy dissipation and is very sensitive to time, while the present method is more suitable for the fatigue experiment of smooth flat sample, and the process is simple with stable results, which is convenient for the application in engineering practice.

Key words: infrared thermography, energy dissipation, high-cycle fatigue, convection and radiation heat transfer

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