CRACKING OF COATED MATERIALS UNDER TRANSIENT THERMAL STRESSES
- 1 January 1989
- journal article
- research article
- Published by Taylor & Francis in Journal of Thermal Stresses
- Vol. 12 (2) , 125-168
- https://doi.org/10.1080/01495738908961959
Abstract
This paper considers the crack problem for a relatively thin layer bonded to a very thick substrate under “ thermal shock” conditions. The effect of surface cooling rate is studied by assuming the temperature boundary condition to be a ramp function. Among the crack geometries considerd are the edge crack in the coating layer, the broken layer, the edge crack going through the interface, the undercoat crack in the substrate and the embedded crack crossing the interface. The primary calculated quantity is the stress intensity factor at various singular points; the main variables are the relative sizes and locations of cracks, the time, and the duration of the cooling ramp. The problem is solved and results are given for a stainless steel layer welded on a ferritic medium and a ceramic coating on a steel substrateKeywords
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