自由表面に垂直なき裂を有する 傾斜機能遮熱コーティング積層板の非定常熱弾性応答

抄録

In this paper, 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 the Laplace and Fourier transforms, the thermo-mechanical fracture problem is reduced to a singular integral equation, which is solved numerically. The stress intensity factors of the embedded 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.