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首页> 外文期刊>Journal of thermal stresses >A normal crack in a functionally graded thermal barrier coating bonded to a homogeneous elastic substrate under transient thermal loading
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A normal crack in a functionally graded thermal barrier coating bonded to a homogeneous elastic substrate under transient thermal loading

机译：在瞬态热载荷下粘结到均质弹性基材上的功能梯度隔热层中的正常裂纹

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摘要

In this article, the transient thermal fracture problem of a functionally graded thermal barrier coating (FGTBC) containing a normal crack bonded to a homogeneous substrate is considered. The problem is solved for the laminate that is suddenly heated from the upper surface of the FGTBC. The bottom surface of the homogeneous substrate is maintained at the initial temperature. The crack faces are supposed to be completely insulated. Material properties are assumed to be exponentially dependent on the distance from the interface. By using both Laplace and Fourier transforms, the thermomechanical fracture problem is reduced to a singular integral equation, which can be solved numerically. The stress intensity factors of the internal crack and the edge crack are computed and presented as a function of the normalized time for the various values of the nonhomogeneous and geometric parameters.
机译：在本文中，考虑了功能梯度隔热涂层（FGTBC）的瞬态热断裂问题，该涂层包含粘结到均质基材上的常规裂纹。对于从FGTBC的上表面突然加热的层压板，该问题得以解决。均质衬底的底表面保持在初始温度。裂纹面应完全绝缘。假定材料特性与界面的距离呈指数关系。通过同时使用拉普拉斯变换和傅立叶变换，将热机械断裂问题简化为奇异积分方程，可以用数值方法求解。计算内部裂纹和边缘裂纹的应力强度因子，并将其作为非均匀和几何参数的各种值的归一化时间的函数。

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