Failure analysis of thermal barrier coatings based on cohesive element and XFEM - Details

author：

Dai, Chenyu (Dai, Chenyu.) ^[1] | Zhong, Shuncong (Zhong, Shuncong.) ^[2] (Scholars：钟舜聪) | Tang, Changming (Tang, Changming.) ^[3] | Fu, Xinbin (Fu, Xinbin.) ^[4] | Huang, Xuebin (Huang, Xuebin.) ^[5]

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Abstract：

In　order　to　better　understand　the　failure　mechanism　of　the　thermal　barrier　coating,　the　ABAQUS　finite　element　software　was　used　to　analyze　the　failure　of　the　thermal　barrier　coating.　Cohesive　element　and　extended　finite　element　(XFEM)　were　used　to　study　the　cracking　of　the　TGO　interface　in　the　thermal　barrier　coating　and　the　initiation　and　propagation　of　random　cracks　in　the　ceramic　coating　(TC)　and　the　oxidation　layer　(TGO).　The　relationship　between　vertical　cracks　and　horizontal　cracks　was　studied.　The　results　shown　that　the　cracking　of　the　TGO　interface　of　the　thermal　barrier　coating　first　occurred　at　the　TGO/TBC　trough,　and　the　initiation　of　the　random　cracks　in　the　ceramic　coating　and　the　oxidation　layer　also　occurred　at　the　TGO/TBC　trough.　The　existence　of　the　vertical　crack　could　inhibit　the　initiation　and　propagation　of　the　horizontal　crack,　and　the　propagation　lengths　at　the　TGO/TBC　trough　was　longer　than　that　of　the　TGO/TBC　crest.　It　indicated　that　the　TGO/TBC　trough　area　was　a　dangerous　area,　which　was　likely　to　cause　crack　initiation　and　propagation　in　this　area.　©　2019,　Editorial　Board　of　Transactions　of　the　China　Welding　Institution,　Magazine　Agency　Welding.　All　right　reserved.

Keyword：

ABAQUS Ceramic coatings Cracks Failure (mechanical) Thermal barrier coatings Thermal conductivity

Community：

[ 1 ] [Dai, Chenyu]Laboratory of Optics, Terahertz and Non-destructive Testing, Fuzhou University, Fuzhou; 350108, China
[ 2 ] [Zhong, Shuncong]Laboratory of Optics, Terahertz and Non-destructive Testing, Fuzhou University, Fuzhou; 350108, China
[ 3 ] [Zhong, Shuncong]Shanghai University, Shanghai; 200072, China
[ 4 ] [Tang, Changming]Laboratory of Optics, Terahertz and Non-destructive Testing, Fuzhou University, Fuzhou; 350108, China
[ 5 ] [Fu, Xinbin]Xiamen Special Equipment Inspection Institute, Xiamen; 361000, China
[ 6 ] [Huang, Xuebin]Xiamen Special Equipment Inspection Institute, Xiamen; 361000, China

Reprint 's Address：

钟舜聪
[zhong, shuncong]shanghai university, shanghai; 200072, china;;[zhong, shuncong]laboratory of optics, terahertz and non-destructive testing, fuzhou university, fuzhou; 350108, china

Email：

zhongshuncong@hotmail.com

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