期刊
ACTA MATERIALIA
卷 59, 期 17, 页码 6519-6529出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.06.018
关键词
Thermal barrier coatings; Acoustic emission; Damage mode; Damage evolution; Rupture time prediction
资金
- National Natural Science Foundation of China [11002122, 50531060, 11002121, 10828205]
- Natural Science Foundation of Hunan Province for Innovation Group [09JJ7004]
- State Key Laboratory of Explosion Science and Technology of China [KFJJ07-7]
The real-time testing and quantitative assessment of damage evolution in thermal barrier coatings (TBCs) is desirable, but still intractable, especially at elevated temperature. In this paper, the fracture process of TBCs subjected to cyclic heating and cooling is monitored using an acoustic emission method. Based on the wavelet analysis of acoustic emission signals, damage modes in TBCs are discriminated. The results show that, due to thermal stress, vertical cracks tend to occur in the heating stage and interface cracks in the cooling stage. The surface crack density and interface crack length are calculated to obtain the quantitative correlation of damage evolution in TBCs and acoustic emission parameters. The rupture time of TBCs can be predicted from the statistical analysis of acoustic emission signals. (C) 2011 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
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