材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
疲労き裂進展の動的直接観察と疲労き裂進展機構
進展速度とき裂先端開口変位の関係
城野 政弘宋 智浩後藤 邦夫山田 真治
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1986 年 35 巻 395 号 p. 918-923

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Fatigue crack growth tests were performed on grain-oriented 3% silicon iron in a high-resolution, field emission type scanning electron microscope, using a specially designed servo-hydraulic fatigue loading system, and direct, real time observations of a growing fatigue crack were made.
Good correlation was found between crack growth rate, da/dn, and crack tip opening displacement, CTOD, under constant amplitude load testing. The ratio of growth increment to CTOD, however, was reduced with decrease of crack growth rate. Fatigue crack growth behavior and relation between growth rate and CTOD under Hi-Lo two step loading tests were also discussed.

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