腐食環境中における高強度鋼の微小き裂進展挙動に及ぼす繰返し速度の影響

概要

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The growth characteristics data of a chemically short crack were generated for a high strength steel SNCM 439. The tests were conducted with axial loading under constant stress range at cyclic frequencies of 0.1, 1.0 and 10 Hz in room air and a 1% NaCl solution. The effect of cyclic frequency on short crack growth in a corrosive environment was evaluated and the results compared to long crack growth data generated with CCT specimens. The growth rates of short cracks were accelerated markedly in the 1% NaCl solution, as compared to those of long cracks under the same frequency. Furthermore, the short crack growth rates in the 1 % NaCl solution increased with decreasing cyclic frequency. These results indicate that the cyclic frequency is concerned with the chemical driving force of a short crack in a corrosive environment.
一般社団法人日本機械学会の論文
1988-08-25