论文期刊

Effect of pre-existing microcrack on the cyclic displacement instability in thermal barrier coating systems




作者: Luochuan Su, Weixu Zhang, TJ Wang
发表/完成日期: 2013-10-20
期刊名称: 13th International Conference on Fracture
期卷:
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论文简介
The displacement instability of the thermally grown oxide (TGO) layer in thermal barrier coating
systems is a critical factor inducing the failure of the system by causing large scale delamination and
spallation. In this paper, the effect of pre-existing microcracks within the ceramic top-coat (TC) on the cyclic
displacement instability under thermal cycling is investigated by a finite element analysis. Stress and the
interface morphology are obtained after thermal cycling when the microcracks pre-exist within the TC. The
influence of various parameters including crack location, crack length and crack direction on the interface
morphology are discussed in detail. It is demonstrated that the existing of microcracks within TC can
aggravate the displacement instability and affect the stress state in TC significantly. However, when the crack
is perpendicular to the flat interface, the aggravation of it on the instability is weakest.
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