鋼におけるAE発生と切欠部の変形形態について

概要

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AE charactristics of notched specimen were studied in view of deformation mode. Concerning to these characteristics there have been many researches which were undertaken mainly related to the fracture mechanics parameter K. However, there seems to be some limitations of it's treatment. For example, while AE mainly generates in the elastic plastic transition region, K-value is useful only in small deformation region. These situations seem to be improved by considering the deformation mode in notched part. In order to investigate the effect of deformation mode on AE generation in bending and tensile tests, experiments were conducted changing the size and shape of notches of test specimens. The experimental results showed that AE generation in notched part was closely related to the behavior of slip lines started at the notch bottom. In addition to the above experiments, AE chracteristics of several kinds of steel and their weld part were studied using notched specimens. The result showed that AE generation in ordinary carbon steel became more active with the increase of carbon content, but in 50 and 60 kg/mm in tensile strength steel the relation mentioned above was not clear due to the effects of chemical composition and microstructure. As for the weld part, there were very low AE activities in weld metal and very high in HAZ.
独立行政法人海上技術安全研究所の論文
1984-03-30