Residual stresses analysis on thermal barrier coatingsndt tool for condition assessment
- Title
- Residual stresses analysis on thermal barrier coatingsndt tool for condition assessment
- Creator
- Reghu V.R.; Ghosh S.; Prabhu A.; Shankar V.; Ramaswamy P.
- Description
- Improvement in the engine efficiency follows reduction in fuel consumption which is possible by increasing the engine combustion temperature. Coating the piston of diesel engine with a high temperature-resistant material, known as thermal barrier coating, generally 68% Y2O3 stabilized ZrO2, is a popular method to reduce the temperature it experiences in service and to increase engine efficiency. Whether bare or coated component, fabrication and different thermal expansion coefficients of the ceramic coating and piston metal cause generation of residual stresses in them. These hidden residual stresses (tensile or compressive) play a significant role in governing the failure mechanism of the different sections of the components and their important role (also developed in service) is mostly neglected in engineering practices. Residual stresses analysis of components in service may throw light on the condition of the components without destroying them. In this work, portable X-ray residual stress analyzer was used to evaluate the condition of AlSi alloys piston flat plates that were coated with 250-m-thick 68% Y2O3 stabilized ZrO2 and subjected to thermal treatments. The analysis revealed (a) residual stress-free pattern for uncoated AlSi substrate, (b) compressive residual stress at the substrate (AlSi)coating (TBC) interface and (c) tensile residual stress at the substrate (AlSi)coating (TBC) interface of a thermal shocked coated substrate. The analysis method exhibited good possibility for using this as a tool for non-destructive testing for predicting the onset of failure at the coating substrate interface, without destroying the component in service. Springer Nature Singapore Pte Ltd 2020.
- Source
- Lecture Notes in Mechanical Engineering, pp. 175-183.
- Date
- 2020-01-01
- Publisher
- Springer Science and Business Media Deutschland GmbH
- Subject
- Interface; Residual stress; Stress analyzer; Thermal barrier coating; X-ray
- Coverage
- Reghu V.R., Department of Mechanical and Automobile Engineering, CHRIST (Deemed to Be University), Bangalore, India; Ghosh S., Department of Mechanical and Automobile Engineering, CHRIST (Deemed to Be University), Bangalore, India; Prabhu A., Department of Mechanical and Automobile Engineering, CHRIST (Deemed to Be University), Bangalore, India; Shankar V., Department of Mechanical and Automobile Engineering, CHRIST (Deemed to Be University), Bangalore, India; Ramaswamy P., Department of Mechanical and Automobile Engineering, CHRIST (Deemed to Be University), Bangalore, India
- Rights
- Restricted Access
- Relation
- ISSN: 21954356; ISBN: 978-981154747-8
- Format
- Online
- Language
- English
- Type
- Conference paper
Collection
Citation
Reghu V.R.; Ghosh S.; Prabhu A.; Shankar V.; Ramaswamy P., “Residual stresses analysis on thermal barrier coatingsndt tool for condition assessment,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 25, 2025, https://archives.christuniversity.in/items/show/20723.