Study on the Relationship Between J-Integral and COD

Abstract

Abstract:

J-integral and crack opening displacement δ(COD) were important parameters for characterization of fractures in engineering materials. The relationship between J-integral and COD has been investigated for a long time and was enerally represented as J = m σyδ, where σy is the yield strength and 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-surface topography analysis (FRASTA) for determining J-integral from fracture surfaces of materials was introduced. 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 used equation. The method was experimentally confirmed to be able to provide a new way to determine the relationship between J-integral and COD.

Key words: FRASTA, J-integral, COD

Y.G. Cao, X.Y. Sun, K. Tanaka. Study on the Relationship Between J-Integral and COD[J]. Acta Metallurgica Sinica (English Letters), 2007, 20(6): 417-424 .

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