The Influence of Transient Thermal Gradients and Substrate Constraint on Delamination of Thermal Barrier Coatings
被引:44
作者:
Sundaram, S.
论文数: 0引用数: 0
h-index: 0
机构:
GE Global Res Ctr, Niskayuma, NY 12309 USAHarvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA
Sundaram, S.
[2
]
Lipkin, D. M.
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h-index: 0
机构:
GE Global Res Ctr, Niskayuma, NY 12309 USAHarvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA
Lipkin, D. M.
[2
]
Johnson, C. A.
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h-index: 0
机构:
GE Global Res Ctr, Niskayuma, NY 12309 USAHarvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA
Johnson, C. A.
[2
]
Hutchinson, J. W.
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机构:
Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USAHarvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA
Hutchinson, J. W.
[1
]
机构:
[1] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA
[2] GE Global Res Ctr, Niskayuma, NY 12309 USA
来源:
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
|
2013年
/
80卷
/
01期
关键词:
thermal barrier coatings;
delamination;
temperature gradients;
substrate bending;
bending constraint;
D O I:
10.1115/1.4007727
中图分类号:
O3 [力学];
学科分类号:
08 ;
0801 ;
摘要:
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. [DOI: 10.1115/1.4007727]
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页数:13
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[11]
Edge effects in thin film delamination[J]. Yu, HH;He, MY;Hutchinson, JW. ACTA MATERIALIA, 2001(01)