STUDY ON THE RELATIONSHIP BETWEEN J-INTEGRAL AND COD
来源期刊：Acta Metallurgica Sinica2007年第6期
论文作者：Y. G. Cao X. Y. Sun K. Tanaka
Key words：FRASTA (fracture-surface topography analysis); J-integral; COD (crack opening displacement);
Abstract: J-integral and crack opening displacement δ (COD) were important parameters for characterizationof fractures in engineering materials. The relationship between J-integral and COD has beeninvestigated for a long time and was generally represented as J = mσyδ, where σy is the yield strengthand m is a function of specimen geometry and material properties. To determine the value of m,extensive studies and experiments have been performed. The method that used the fracture-surfacetopography analysis (FRASTA) for determining J-integral from fracture surfaces of materials wasintroduced. On the basis of the relationship between COD and fracture surface average profile,the relationship between J-integral and COD was deduced and compared with the generally usedequation. The method was experimentally confirmed to be able to provide a new way to determinethe relationship between J-integral and COD.
Y. G. Cao1，X. Y. Sun1，K. Tanaka2
(1.Department of Engineering Mechanics, College of Architecture and Transport and Storage Engineering, China University of Petroleum, Dongying 257061, China;
2.Department of Mechanical Systems Engineering, Toyama Prefectural University,Toyama 939-0398, Japan)
Abstract:J-integral and crack opening displacement δ (COD) were important parameters for characterizationof fractures in engineering materials. The relationship between J-integral and COD has beeninvestigated for a long time and was generally represented as J = mσyδ, where σy is the yield strengthand m is a function of specimen geometry and material properties. To determine the value of m,extensive studies and experiments have been performed. The method that used the fracture-surfacetopography analysis (FRASTA) for determining J-integral from fracture surfaces of materials wasintroduced. On the basis of the relationship between COD and fracture surface average profile,the relationship between J-integral and COD was deduced and compared with the generally usedequation. The method was experimentally confirmed to be able to provide a new way to determinethe relationship between J-integral and COD.
Key words:FRASTA (fracture-surface topography analysis); J-integral; COD (crack opening displacement);
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