簡易測定法（ＩＤ法）で得られた残留応力の組織による変化―アスペクト比の異なるＡｌ２Ｏ３セラミックスの場合―

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タイトル別名
  • Variation of Microstructure Upon Residual Stress, as Obrained by the Vickers Indentation Method in Al2O3 Ceramics with Differing Aspect Ratios
  • カンイ ソクテイホウ IDホウ デ エラレタ ザンリュウ オウリョク ノ ソシキ ニ ヨル ヘンカ アスペクトヒ ノ コトナル Al2O3 セラミックス ノ バアイ
  • Method in Al<sub>2</sub>O<sub>3</sub> Ceramics with Differing Aspect Ratios
  • ―アスペクト比の異なるAl<sub>2</sub>O<sub>3</sub>セラミックスの場合―

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Recently, an indentation (ID) method using a Vickers hardness tester has been specified as a standard by the Society of Materials Science, Japan (JSMS-SD-4-01) as the method for practical use. This method determined a base value (KC) while measuring residual stress by the ID method. Porosity and other factors have been reported to cause problems when using the ID method on Al2O3, Si3N4 and ZrO2 as structural ceramics, a fact which motivated the establishment of this new method. The value measured by this method might change not only in response to microstructural factors such as grain size and aspect ratio, but also with different types of materials. However, this problem has received little attention to date.<br>In this study, a prescribed bending moment was loaded on Al2O3 ceramics that differed in microstructure (grain size and aspect ratio). The bending stress value was considered to establish the level of residual stress, and was compared to the value obtained by the ID method. The variation of that relationship was examined as a function of the aspect ratio. The stress ratio φ' was defined as the ratio of the value determined by the ID method and the way that tensile stress σT or compressive stress σC varied with the aspect ratio. This alteration appears commonly in the case of tensile stress. It was thought that the origin of changing φ' (stress ratio) values was interaction across crack faces by grain bridging during cracking, which varied with the aspect ratio, making the crack propagation resistance value different in various materials.

収録刊行物

  • 材料

    材料 54 (9), 965-970, 2005

    公益社団法人 日本材料学会

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