モードIクリープき裂における空げき分布観察と損傷場の定量化(<小特集>:非弾性挙動の力学)

概要

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Damage field around an extending mode I creep crack in Oxigen Free High Conductivity (OFHC) copper is quantified by means of micrographical observation of grain-boundary cavities and by applying the quantitative stereology. Namely, by performing a series of uniaxial creep tests at 250℃ for thin-walled OFHC copper tubular specimens with a pair of perforated holes, the nucleation of creep crack and the development of garin-boundary cavities around the crack-tip are first observed and photographed by the use of optical microscope at several stages of creep crack growth. Then, the distribution of the microcrack density is calculated, by applying the theory of the quantitative stereology to the results of these observations, and the damage field is identified by the density of microcracks. Finally, the resulting damage field is compared with the analytical expression discussed in the former papers of the authors.
社団法人日本機械学会の論文
2000-03-25