SUS304鋼における下限界近傍の高温疲労き裂進展の周波数依存性に基づくき裂進展抵抗に関する考察

概要

論文の詳細を見る
In a previous paper fatigue crack growth tests were conducted using constant K_<max> test method at 550℃ and loading frequency of 30,3 or 30-3-30Hz. At any frequency, after the increase of K_<max> in the near threshold region, crack grew in the region below the threshold value determined using conventional constant R test method. By the comparison of the results it was shown that loading frequency gave several influences on threshold behavior and crack growth behavior. In this study, with the comparison using the ratio of da/dNs at f=3Hz and 30Hz, more details of the several influences were investigated. From the comparison, it was shown that two characteristics of resistance against crack growth, i.e. frequency dependence of resistance itself and that of increasing rate of resistance lead to frequency dependence of crack growth in the region below the conventional threshold value.
一般社団法人日本機械学会の論文
1999-07-25