単軸圧縮負荷下におけるプラズマ溶射遮熱皮膜の応力-ひずみ応答

概要

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Mechanical properties and cyclic stress-strain behavior of thermal barrier coatings under uniaxial compressive loading were examined. Specimens of plasma-sprayed ZrO_2-8%Y_2O_3, Al_2O_3, CoNiCrAlY and NiCr were fabricated to test the coating materials independent of the substrate. Stress-strain response was measured using the laser speckle strain/displacement gauge (SSDG). The coatings showed a nonlinear stress-strain response with a considerably lower elastic modulus compared with that of the bulk material. The nonlinearity of the stress-strain response was less significant when the coating contained less microscopic defects and pores. In the case of the coating with many defects, the compliance was found to decrease after the coating underwent a compressive stress and the compliance was also found to decrease with increasing the number of compressive stress cycles.
一般社団法人日本機械学会の論文
2002-09-25