{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1390282681466756608.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.2320/jinstmet1952.59.8_862"}},{"identifier":{"@type":"NDL_BIB_ID","@value":"3627992"}},{"identifier":{"@type":"URI","@value":"http://id.ndl.go.jp/bib/3627992"}},{"identifier":{"@type":"URI","@value":"https://ndlsearch.ndl.go.jp/books/R000000004-I3627992"}},{"identifier":{"@type":"URI","@value":"https://www.jstage.jst.go.jp/article/jinstmet1952/59/8/59_8_862/_pdf"}},{"identifier":{"@type":"NAID","@value":"10001671008"}}],"dc:title":[{"@language":"ja","@value":"ホットプレスSi<SUB>3</SUB>N<SUB>4</SUB>における破壊靭性と曲げ強度との相関"},{"@language":"en","@value":"Relation between Fracture Toughness and Strength in Si<SUB>3</SUB>N<SUB>4</SUB> Ceramics"},{"@value":"ホットプレスSi3N4における破壊靭性と曲げ強度との相関"},{"@language":"ja-Kana","@value":"ホット プレス Si3N4 ニ オケル ハカイ ジンセイ ト マゲ キョウド"}],"description":[{"type":"abstract","notation":[{"@language":"en","@value":"The relationship between fracture toughness and bending strength in Si<SUB>3</SUB>N<SUB>4</SUB> ceramics was studied. Three-point bending tests were carried out. The fracture toughness was estimated by the single edge precracked beam method. Grain morphology was observed using transmission microscopy.<BR>The fracture toughness increased with grain growth. The strength increased with fracture toughness up to <I>K</I><SUB>IC</SUB>=7 MPam<SUP>0.5</SUP> and decreased in spite of increasing fracture toughness over 7 MPam<SUP>0.5</SUP>.<BR>The linear elastic fracture mechanics is not applicable to small cracks in ceramics. Because of this, the effective crack size for fracture is not equal to the original equivalent crack length. In order to elucidate the fracture toughness-strength relation, the effective crack size must be estimated. In the previous work, the tendency in the crack size-strength relation was explained by adding a material-dependent constant to the original equivalent crack length. But this constant was not related to the physical process of fracture and was calculated according to the experimental results. In this study, the effective crack size of fracture origin was estimated experimentally and the fracture toughness-strength relation was investigated using the effective crack size.<BR>The increase in strength up to 7 MPam<SUP>0.5</SUP> resulted from a constant effective crack size. The decrease in strength over 7 MPam<SUP>0.5</SUP> was due to both the increase in fracture toughness by the R-curve behavior and the increase in effective crack size."}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1410282681466756608","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000003639065"}],"foaf:name":[{"@language":"ja","@value":"木下 俊哉"},{"@language":"en","@value":"Kinoshita Toshiya"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Advanced Materials & Technology Research Laboratories, Nippon Steel Corporation"},{"@language":"ja","@value":"新日本製鉄株式会社先端技術研究所"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00214876"},{"@type":"LISSN","@value":"00214876"},{"@type":"EISSN","@value":"18806880"},{"@type":"EISSN","@value":"24337501"},{"@type":"NDL_BIB_ID","@value":"000000018323"},{"@type":"ISSN","@value":"00214876"},{"@type":"PISSN","@value":"http://id.crossref.org/issn/00214876"},{"@type":"PISSN","@value":"http://id.crossref.org/issn/00214426"},{"@type":"NCID","@value":"AN00187860"}],"prism:publicationName":[{"@language":"ja","@value":"日本金属学会誌"},{"@language":"en","@value":"Journal of the Japan Institute of Metals and Materials"},{"@language":"en","@value":"J. Japan Inst. Metals"},{"@language":"en","@value":"J. Japan Inst. Metals and Materials"},{"@language":"en","@value":"Journal of the Japan Institute of Metals"},{"@language":"ja","@value":"日本金属学会誌"},{"@language":"en","@value":"J.Japan Inst.Metals"},{"@language":"ja","@value":"日本金屬學會誌"}],"dc:publisher":[{"@language":"en","@value":"The Japan Institute of Metals and Materials"},{"@language":"ja","@value":"公益社団法人 日本金属学会"}],"prism:publicationDate":"1995","prism:volume":"59","prism:number":"8","prism:startingPage":"862","prism:endingPage":"868"},"reviewed":"false","url":[{"@id":"http://id.ndl.go.jp/bib/3627992"},{"@id":"https://ndlsearch.ndl.go.jp/books/R000000004-I3627992"},{"@id":"https://www.jstage.jst.go.jp/article/jinstmet1952/59/8/59_8_862/_pdf"}],"availableAt":"1995","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=ceramics","dc:title":"ceramics"},{"@id":"https://cir.nii.ac.jp/all?q=silicon%20nitride","dc:title":"silicon nitride"},{"@id":"https://cir.nii.ac.jp/all?q=fracture%20toughness","dc:title":"fracture toughness"},{"@id":"https://cir.nii.ac.jp/all?q=strength","dc:title":"strength"},{"@id":"https://cir.nii.ac.jp/all?q=fracture%20mechanics","dc:title":"fracture mechanics"},{"@id":"https://cir.nii.ac.jp/all?q=grain%20size","dc:title":"grain size"},{"@id":"https://cir.nii.ac.jp/all?q=equivalent%20crack%20length","dc:title":"equivalent crack length"}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360011144499483520","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Crack‐Interface Grain Bridging as a Fracture Resistance Mechanism in Ceramics: II, Theoretical Fracture Mechanics Model"}]},{"@id":"https://cir.nii.ac.jp/crid/1360011144550952320","@type":"Article","relationType":["references","cites"],"jpcoar:relatedTitle":[{"@value":"Role of Grain Size in the Strength and R‐Curve Properties of Alumina"}]},{"@id":"https://cir.nii.ac.jp/crid/1360019298943246592","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Relationship 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