Study on Fracture Strength of WC-12Co Thermal Sprayed Coating under Mixed Loading Mode I & III in Crack Surface Displacement

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  • ＷＣ‐１２Ｃｏ溶射被膜のＩ及びＩＩＩの混合モード下における破壊強度に関する研究
  • WC 12Co ヨウシャ ヒマク ノ 1 オヨビ 3 ノ コンゴウ モード カ ニ オケル ハカイ キョウド ニ カンスル ケンキュウ

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Abstract

In this study, fracture strength of WC-12Co thermal sprayed coating is investigated experimentally and analytically. In the experiments, one pair of butt cylindrical specimen with coating is subjected to combined tension with torsion stresses. Fracture loci were obtained for three kinds of thickness of the coating in σ-τ stress plane. Stress distributions at crack tip singular point on fractured surfaces are analyzed by Finite-Element-Method and is approximated by the expressionσ=KR-1 where R means normalized thickness coordinate. It is found that the normal stress distributions are common to all cases of testing stress conditions and so fracture condition of a brittle coating is represented as K≥Kcr in the normal stress distribution even under mixed deformation mode I with III. Delamination critical shear stress distribution could also be obtained.

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