A normal crack in a functionally graded thermal barrier coating bonded to a homogeneous elastic substrate under transient thermal loading
A normal crack in a functionally graded thermal barrier coating bonded to a homogeneous elastic substrate under transient thermal loading
复制标题
DOI：
10.1080/01495739.2018.1520620
复制
发表时间：
2018-12
影响因子：
2.8
通讯作者：
S. Ueda;Y. Nakano
中科院分区：
文献类型：
--
作者：
S. Ueda;Y. Nakano
摘要 在本文中，考虑了功能梯度热障涂层（FGTBC）的瞬态热断裂问题，该涂层包含与均匀基材粘合的正向裂纹。对于从FGTBC的上表面突然加热的层压板的问题得到解决。均质基板的底面保持在初始温度。裂纹面应该是完全绝缘的。假设材料属性与距界面的距离呈指数关系。通过使用拉普拉斯变换和傅里叶变换，热机械断裂问题被简化为奇异积分方程，并且可以通过数值求解。计算内部裂纹和边缘裂纹的应力强度因子，并将其呈现为非均匀参数和几何参数的各种值的归一化时间的函数。
Abstract 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.