IGTC-70 A Method of Thermal Stress Reduction in Oxidation-Protective Layers by Surface Geometry Modification(Session C-6 SURFACE COATING)
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概要
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This paper presents a method of reducing the residual stress in the coated layer by introducing a non-flat configuration to the material surface. The model in the present analysis consists of a semi-infinite substrate with sinusoidal surface coated by a uniform thickness layer. The two-dimensional elastic problem is analytically solved with non-dimensional parameters: the wave height/length ratio, the coating thickness/wave length ratio, and the elastic moduli ratio of the substrate and the coating. The non-dimensional reduced stresses in the coated layer are graphically described with these parameters. The optimum possible reduction of stress and the corresponding non-dimensional parameters are shown for the elastic moduli ratio. Some numerical examples are given. Related experiments are conducted in order to confirm the effect of stress reduction, using aluminum alloy substrates coated with brittle paint.
- 公益社団法人日本ガスタービン学会の論文
著者
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Shioya T.
Department Of Aeronautics And Astronautics University Of Tokyo
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Uenishi K.
Department of Aeronautics and Astronautics, University of Tokyo
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Uenishi K.
Department Of Aeronautics And Astronautics University Of Tokyo