Y.G. Cao
金属学报(英文版)
To investigate the causes that led to the formation of cracks in materials, a novel method that only considered the fracture
surfaces for determining the fracture toughness parameters of J-integral for plain strain was proposed. The principle of the
fracture-surface topography analysis (FRASTA) was used. In FRASTA, the fracture surfaces were scanned by laser microscope and the
elevation data was recorded for analysis. The relationship between J-integral and fracture surface average profile for plain strain
was deduced. It was also verified that the J-integral determined by the novel method and by the compliance method matches each
other well.
关键词:
FRASTA
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null
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Y.G. Cao
,
X.Y. Sun
金属学报(英文版)
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.
关键词:
FRASTA
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null
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null
