SUS304鋼における高温疲労き裂進展の下限界挙動の周波数依存性

概要

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The loading frequency dependence of fatigue crack growth in the near-threshold region were investigated using constant K_<max> test method at 550℃. Crack growth rates at f=30 and 3 Hz in different specimens were compared. To realize intra-specimen comparisons, loading frequency was changed from 30 Hz to 3 Hz and 30 Hz. After the increase of K_<max> in the threshold condition, crack grew even in the region below the threshold value determined using conventional constant R test method at every loading frequency. By comparing crack growth behaviors at different loading frequencies. it was found that the loading frequency gave some influences on threshold behavior and crack growth behavior in the region below the conventional threshold value.
一般社団法人日本機械学会の論文
1999-02-25