圧縮負荷によりせん断密着強さを測定する試験法の検討

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  • Study of novel test method to measure shear adhesion strength by compressive loading
  • アッシュク フカ ニ ヨリ センダンミッチャク ツヨサ オ ソクテイ スル シケンホウ ノ ケントウ

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A new test method is proposed in this study to evaluate the adhesion strength of thermal spray coatings.The proposed method can evaluate the adhesion strength of coatings against to the shear loading acted at the interface by the compressive external loading.In order to verify the validity of the proposed method,the influence of the gage length on the evaluated shear adhesion strength was investigated.With the decreasing of the gage length of the specimen,the evaluated shear adhesion strength decreased and the dispersion of it increased.However,the dependence of gage length on the evaluated shear adhesion strength and the dispersion of it decreased with the increasing of the gage length.It was revealed from these experimental results that there are limits of the specimen gage length and the specimen width for the proposed test method.And to obtain the valid shear adhesion strength the specimen should have the larger gage section than a certain length and width which depend on the mechanical properties of coating and substrate.It was also discussed to expand the proposed test method to evaluate the interfacial fracture toughness and the resistance to the fatigue crack propagation at the interface.

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