The Influence of Transient Thermal Gradients and Substrate Constraint on Delamination of Thermal Barrier Coatings

DSpace/Manakin Repository

The Influence of Transient Thermal Gradients and Substrate Constraint on Delamination of Thermal Barrier Coatings

Citable link to this page

 

 
Title: The Influence of Transient Thermal Gradients and Substrate Constraint on Delamination of Thermal Barrier Coatings
Author: Hutchinson, John W.; Sundaram, S.; Johnson, C. A.; Lipkin, D. M.

Note: Order does not necessarily reflect citation order of authors.

Citation: Sundaram, S., D. M. Lipkin, C. A. Johnson, and John W. Hutchinson. 2013. The influence of transient thermal gradients and substrate constraint on delamination of thermal barrier coatings. Journal of Applied Mechanics 80(1): 011002.
Full Text & Related Files:
Abstract: A systematic study of factors affecting the delamination energy release rate and mode mix of a thermal barrier coating attached to a substrate is presented accounting for the influence of thermal gradients combined with rapid hot surface cooling. Transient thermal gradients induce stress gradients through the coating and substrate, which produce overall bending if the substrate is not very thick and if it is not constrained. Due to their influences on the coating stresses, substrate thickness and constraint are important aspects of the mechanics of delamination of coating-substrate systems, which must be considered when laboratory tests are designed and for lifetime assessment under in-service conditions. Temperature gradients in the hot state combined with rapid cooling give rise to a maximum energy release rate for delamination that occurs in the early stage of cooling and that can be considerably larger than the driving force for delamination in the cold state. The rates of cooling that give rise to a large early stage energy release rate are identified.
Published Version: doi:10.1115/1.4007727
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10196729
Downloads of this work:

Show full Dublin Core record

This item appears in the following Collection(s)

 
 

Search DASH


Advanced Search
 
 

Submitters