疲労き裂進展または応力腐食割れ機構が支配的となるアルミニウム合金のき裂進展特性

抄録

Crack growth characteristics were investigated under static and cyclic loading conditions for aluminum alloys in humid and dry air environments in order to clarify the dominating crack growth mechanisms, i.e. stress corrosion cracking (SCC) and fatigue crack growth (FCG). The frequencies of the cyclic loading varied between 0.02 Hz and 20 kHz using three types of testing machine including ultrasonic fatigue. Crack growth mechanisms were discussed based on the traditional model proposed by McEvily and Wei. The results revealed that the crack growth mechanisms were dominated by SCC at 0.02Hz, while they were dominated by FCG at 20Hz and 20kHz.