Thermal fatigue failure induced by delamination in thermal barrier coating
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| Title: | Thermal fatigue failure induced by delamination in thermal barrier coating |
|---|---|
| Authors: | Zhou, Y.C.1,2 zhou@rift.mech.tohoku.ac.jp, Hashida, T.1 |
| Source: | International Journal of Fatigue. Feb2002, Vol. 24 Issue 2-4, p407. 11p. |
| Subjects: | Thermal fatigue of metals, Delamination of composite materials, Aerodynamic heating, Acoustic emission |
| Abstract: | The paper presents the experimental and theoretical investigation on the thermal fatigue failure induced by delamination in thermal barrier coating system. Laser heating method was used to simulate the operating state of TBC (thermal barrier coating) system. The non-destructive evaluation such as acoustic emission (AE) detect was used to study the evolution of TBC system damage. Micro-observation and AE detect both revealed that fatigue crack was in two forms: surface crack and interface delamination. It was found that interface delamination took place in the period of cooling or heating. Heating or cooling rate and temperature gradient had an important effect on interface delamination cracking propagation. A theoretical model on interface delamination cracking in TBC system at operating state is proposed. In the model, a membrane stress P and a bending moment M are designated the thermal loads of the thermal stress and temperature gradient in TBC system. In this case, the coupled effect of plastic deformation, creep of ceramic coating as well as thermal growth oxidation (TGO) and temperature gradient in TBC system was considered in the model. The thermal stress intensity factors (TSIFs) in non-FGM (functional gradient material) thermal barrier coating system is analytical obtained. The numerical results of TSIFs reveal some same results as obtained in experimental test. The model is based on fracture mechanics theory about heterogeneous materials and it gives a rigorous explanation of delaminations in TBC system loaded by thermal fatigue. Both theoretical analysis and experimental observation reveal an important fact: delaminations are fatigue cracks which grow during thermal shocks due to compressive stresses in the loading, this loads the delaminations cracks in mixed I and II mode. [Copyright &y& Elsevier] |
| Copyright of International Journal of Fatigue is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 7758674 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Thermal fatigue failure induced by delamination in thermal barrier coating – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Zhou%2C+Y%2EC%2E%22">Zhou, Y.C.</searchLink><relatesTo>1,2</relatesTo><i> zhou@rift.mech.tohoku.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Hashida%2C+T%2E%22">Hashida, T.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Fatigue%22">International Journal of Fatigue</searchLink>. Feb2002, Vol. 24 Issue 2-4, p407. 11p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Thermal+fatigue+of+metals%22">Thermal fatigue of metals</searchLink><br /><searchLink fieldCode="DE" term="%22Delamination+of+composite+materials%22">Delamination of composite materials</searchLink><br /><searchLink fieldCode="DE" term="%22Aerodynamic+heating%22">Aerodynamic heating</searchLink><br /><searchLink fieldCode="DE" term="%22Acoustic+emission%22">Acoustic emission</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The paper presents the experimental and theoretical investigation on the thermal fatigue failure induced by delamination in thermal barrier coating system. Laser heating method was used to simulate the operating state of TBC (thermal barrier coating) system. The non-destructive evaluation such as acoustic emission (AE) detect was used to study the evolution of TBC system damage. Micro-observation and AE detect both revealed that fatigue crack was in two forms: surface crack and interface delamination. It was found that interface delamination took place in the period of cooling or heating. Heating or cooling rate and temperature gradient had an important effect on interface delamination cracking propagation. A theoretical model on interface delamination cracking in TBC system at operating state is proposed. In the model, a membrane stress P and a bending moment M are designated the thermal loads of the thermal stress and temperature gradient in TBC system. In this case, the coupled effect of plastic deformation, creep of ceramic coating as well as thermal growth oxidation (TGO) and temperature gradient in TBC system was considered in the model. The thermal stress intensity factors (TSIFs) in non-FGM (functional gradient material) thermal barrier coating system is analytical obtained. The numerical results of TSIFs reveal some same results as obtained in experimental test. The model is based on fracture mechanics theory about heterogeneous materials and it gives a rigorous explanation of delaminations in TBC system loaded by thermal fatigue. Both theoretical analysis and experimental observation reveal an important fact: delaminations are fatigue cracks which grow during thermal shocks due to compressive stresses in the loading, this loads the delaminations cracks in mixed I and II mode. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of International Journal of Fatigue is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/S0142-1123(01)00096-2 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 11 StartPage: 407 Subjects: – SubjectFull: Thermal fatigue of metals Type: general – SubjectFull: Delamination of composite materials Type: general – SubjectFull: Aerodynamic heating Type: general – SubjectFull: Acoustic emission Type: general Titles: – TitleFull: Thermal fatigue failure induced by delamination in thermal barrier coating Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Zhou, Y.C. – PersonEntity: Name: NameFull: Hashida, T. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 02 Text: Feb2002 Type: published Y: 2002 Identifiers: – Type: issn-print Value: 01421123 Numbering: – Type: volume Value: 24 – Type: issue Value: 2-4 Titles: – TitleFull: International Journal of Fatigue Type: main |
| ResultId | 1 |
