1 CrMoV鋼の高温多軸低サイクル疲労下におけるき裂成長挙動
1992 年 58 巻 550 号 p. 951-957
詳細
1992 年 58 巻 550 号 p. 951-957
Microcrack growth behavior under axial and torsional loading at 550°C was observed. Cracking behavior was correlated with the results of microdamage observations using several strain parameters. From the microdamage observation, micro-cracking of oxide film at the crack tip in the strain localized region seems to be a dominant factor of micromechanism of fatigue crack growth. The maximum principal strain, which is the linear summation of the shear strain and the normal strain perpendicular to the crack path, has been identified as an important parameter in multiaxial fatigue at high temperature. A good correlation was obtained between the principal strain range and the crack growth rate.
