腐食環境中において回転曲げ負荷を受ける高強度鋼の微小き裂進展挙動

概要

論文の詳細を見る
The characteristics of small fatigue crack growth for a high strength steel SNCM 439 were investigated. The tests were conducted under constant stress range or constant stress intensity range conditions at a cyclic frequency of 1 Hz in room air and a 1 % NaCl solution. Crack growth rates of small cracks were accelerated markedly in the 1 % NaCl solution, as compared to those of long cracks under the same conditions. The crack growth rates under constant stress intensity range in the 1 % NaCl solution decreased with increasing crack length. This result indicates that the chemical driving force decreases as the crack grows. Under static SCC, the small crack grew at a stress intensity below K_<I SCC> of the long crack. It is suggested that the SCC behavior of the small crack is responsible for the chemically short crack.
一般社団法人日本機械学会の論文
1988-04-25