A normal crack in a functionally graded thermal barrier coating bonded to a homogeneous elastic substrate under transient thermal loading. Issue 10 (2nd December 2018)

• Record Type: Journal Article
• Authors: Ueda, Sei; Nakano, Yuuya
• Is Part Of: Journal of thermal stresses. Volume 41:Issue 10/12(2018)
• Page Start: 1487
• Page End: 1500
• Publication Date: 2018-12-02
• Subjects: Functionally graded thermal barrier coating -- fracture mechanics -- elasticity -- normal crack -- stress intensity factor -- integral transform -- transient response; Thermal stresses -- Periodicals; 620.1121
• DOI: 10.1080/01495739.2018.1520620
• Languages: English
• ISSNs: 0149-5739

Abstract

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.