The Effect of Interfacial Roughness on Residual Stresses in Electron Beam-Physical Vapor Deposition of Thermal Barrier Coatings
Residual stresses play an essential role in determining the failure mechanisms and life of an electron beam-physical vapour deposition thermal barrier coating (EB-PVD TBC) system. In this paper, a new transitional roughness model was proposed and applied to describe the interfacial roughness profile...
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MDPI AG
2021-03-01
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| Series: | Coatings |
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| Online Access: | https://www.mdpi.com/2079-6412/11/3/341 |
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doaj-7b94bc80db034017a19fef9774f8da202021-03-18T00:02:03ZengMDPI AGCoatings2079-64122021-03-011134134110.3390/coatings11030341The Effect of Interfacial Roughness on Residual Stresses in Electron Beam-Physical Vapor Deposition of Thermal Barrier CoatingsBochun Zhang0Kuiying Chen1Natalie Baddour2Department of Mechanical Engineering, University of Ottawa, Ottawa, ON K1N 6N5, CanadaStructures, Materials and Manufacturing Laboratory, Aerospace Research Centre, National Research Council Canada, Ottawa, ON K1N 6N5, CanadaDepartment of Mechanical Engineering, University of Ottawa, Ottawa, ON K1N 6N5, CanadaResidual stresses play an essential role in determining the failure mechanisms and life of an electron beam-physical vapour deposition thermal barrier coating (EB-PVD TBC) system. In this paper, a new transitional roughness model was proposed and applied to describe the interfacial roughness profile during thermal cycles. Finite element models were implemented to calculate residual stresses at specific positions close to the interface of TBCs using temperature process-dependent model parameters. Combining stresses evaluated at valleys of the topcoat (TC) and excessive sharp tip roughness profiles, positions where the maximum out-of-plane residual stresses occur were identified and used to explain possible cracking routes of EB-PVD TBCs as interfacial roughness evolves during thermal cycling.https://www.mdpi.com/2079-6412/11/3/341stress modelFE modeltemperature-process dependent parametersevolution of interfacial roughnessparametric studytransitional roughness approximated model |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Bochun Zhang Kuiying Chen Natalie Baddour |
| spellingShingle |
Bochun Zhang Kuiying Chen Natalie Baddour The Effect of Interfacial Roughness on Residual Stresses in Electron Beam-Physical Vapor Deposition of Thermal Barrier Coatings Coatings stress model FE model temperature-process dependent parameters evolution of interfacial roughness parametric study transitional roughness approximated model |
| author_facet |
Bochun Zhang Kuiying Chen Natalie Baddour |
| author_sort |
Bochun Zhang |
| title |
The Effect of Interfacial Roughness on Residual Stresses in Electron Beam-Physical Vapor Deposition of Thermal Barrier Coatings |
| title_short |
The Effect of Interfacial Roughness on Residual Stresses in Electron Beam-Physical Vapor Deposition of Thermal Barrier Coatings |
| title_full |
The Effect of Interfacial Roughness on Residual Stresses in Electron Beam-Physical Vapor Deposition of Thermal Barrier Coatings |
| title_fullStr |
The Effect of Interfacial Roughness on Residual Stresses in Electron Beam-Physical Vapor Deposition of Thermal Barrier Coatings |
| title_full_unstemmed |
The Effect of Interfacial Roughness on Residual Stresses in Electron Beam-Physical Vapor Deposition of Thermal Barrier Coatings |
| title_sort |
effect of interfacial roughness on residual stresses in electron beam-physical vapor deposition of thermal barrier coatings |
| publisher |
MDPI AG |
| series |
Coatings |
| issn |
2079-6412 |
| publishDate |
2021-03-01 |
| description |
Residual stresses play an essential role in determining the failure mechanisms and life of an electron beam-physical vapour deposition thermal barrier coating (EB-PVD TBC) system. In this paper, a new transitional roughness model was proposed and applied to describe the interfacial roughness profile during thermal cycles. Finite element models were implemented to calculate residual stresses at specific positions close to the interface of TBCs using temperature process-dependent model parameters. Combining stresses evaluated at valleys of the topcoat (TC) and excessive sharp tip roughness profiles, positions where the maximum out-of-plane residual stresses occur were identified and used to explain possible cracking routes of EB-PVD TBCs as interfacial roughness evolves during thermal cycling. |
| topic |
stress model FE model temperature-process dependent parameters evolution of interfacial roughness parametric study transitional roughness approximated model |
| url |
https://www.mdpi.com/2079-6412/11/3/341 |
| work_keys_str_mv |
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