年次大会講演論文集
Online ISSN : 2433-1325
セッションID: 709
会議情報
球圧子押込み試験によるセラミックス部材表面層の破壊じん性評価(G03-2 き裂・破壊,G03 材料力学)
高松 徹三好 良夫田邉 裕貴瀬川 領祥
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会議録・要旨集 フリー

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The purpose of this study is to confirm the validity for evaluation of fracture toughness on the surface layer of ceramics by the sphere indentation test. The sphere indentation tests using HIP sintered Si_3N_4 specimens were carried out to obtain the ring crack initiation load for various indentation diameters 2R. On the assumption that a ring crack is induced from microcracks on the surface layer, the crack length c_i of microcracks were estimated from the experimental results in terms of a stress intensity factor K_I for a surface crack under the sphere-plate contact loading condition. The ring crack initiation condition was assumed as K_I.>K_<th> where K_<th> is the threshold fracture toughness and was assumed as 5.3 MPa・m^<1/2>. The mean value of c_i ws 8-9 μm and was almost independent of 2R in the case of large 2R.
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