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http://dx.doi.org/10.3795/KSME-A.2010.34.9.1227

Cracking Near a Hole on a Heat- Resistant Alloy Subjected to Thermo-Mechanical Cycling  

Li, Feng-Xun (Dept. of Mechanical Systems Engineering, Chonnam Nat'l Univ.)
Kang, Ki-Ju (Dept. of Mechanical Systems Engineering, Chonnam Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.34, no.9, 2010 , pp. 1227-1233 More about this Journal
Abstract
In the hot section of a gas turbine, the turbine blades were protected from high temperature by providing a thermal barrier coating (TBC) as well as by cooling air flowing through internal passages within the blades. The cooling air then passed through discrete holes on the blade surface, creating a film of cooling air that further protects the surface from the hot mainstream flow. The holes are subjected to stresses resulting from the lateral growth of thermally grown oxide, the thermal expansion misfit between the constituent layers, and the centrifugal force due to high-speed revolution; these stresses often result in cracking. In this study, the deformation and cracks occurring near a hole on a heat-resistant alloy subjected to thermo-mechanical cycling were investigated. The experiment showed that cracks formed around the hole depending on the applied stress level and the number of cycles. These results could be explained by our analytic solution.
Keywords
Thermally Grown Oxide; Thermo-Mechanical Fatigue; Thermal Stress;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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