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A parametric investigation on thermally driven edge cracking of a coating-substrate system

机译：涂层-基底系统热驱动边缘开裂的参数研究

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摘要

In this article, the thermally driven edge-cracking behavior of a coating-substrate system has been investigated. The transient thermal stress field has been derived in a closed form for the corresponding uncracked counterpart medium. By applying the equal thermal stresses but with opposite sign on the crack surface to be the only external load, the thermal stress intensity factors (TSIFs) at the crack tip were then obtained. The finite element method was utilized to implement the calculation. Based on dimensional analysis, the main dimensionless parameters affecting TSIFs were identified, and the dependence of TSIFs on these parameters was illustrated, such as dimensionless time, crack depth, and thermal constants as well as mechanical constants. These results may provide some useful references for designing a coating-substrate system under rapidly changing thermal environments.
机译：在本文中，已经研究了涂层基体系统的热驱动边缘开裂行为。瞬态热应力场以闭合形式导出，用于对应的未破裂对应介质。通过在裂纹表面施加相等的热应力但符号相反，将其作为唯一的外部载荷，即可获得裂纹尖端的热应力强度因子（TSIF）。利用有限元法进行计算。基于尺寸分析，确定了影响TSIF的主要无因次参数，并说明了TSIF对这些参数的依赖性，如无因次时间，裂纹深度，热常数以及机械常数。这些结果可以为在快速变化的热环境下设计涂层基底系统提供一些有用的参考。

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  • 来源
    《Journal of coatings technology and research》 |2012年第5期|p.541-549|共9页
  • 作者

    Xuejun Chen; Qi Liu; Qian Ma;

  • 作者单位

    Department of Applied Mechanics, University of Science and Technology Beijing, No. 30 Xueyuan Road, Beijing 100083, People's Republic of China;

    Department of Applied Mechanics, University of Science and Technology Beijing, No. 30 Xueyuan Road, Beijing 100083, People's Republic of China;

    Department of Applied Mechanics, University of Science and Technology Beijing, No. 30 Xueyuan Road, Beijing 100083, People's Republic of China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    thermal fracture; coating; thermal stress intensity factor (TSIF); finite element method;

    机译：热断裂;涂层;热应力强度因子（TSIF）;有限元法;

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