S0305-3-1 過大荷重負荷後の疲労き裂進展の加速条件に関して([S0305-3]き裂進展)

概要

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It was found in the previous study that the fatigue crack growth rate actually accelerated after a tensile overload under negative stress ratio. This behavior is related to the residual stress conditions in front of the cracktip. In the present study, the experimental conditions which lead the accelation of crack growth after the overload were investigated. The materials used were carbon steels, S15C, S35C and S45C. The center cracked plate specimen was employed and the overload was appled duringe the fatigue crack gwoth tests under constant stress amplitude with R=-1. The specimen geometry and stress levels of overload and stress amplitde were related to the acceleration of crack growth after the overload. Therefore, the applying overload could be dengerase in some loading conditions.
2010-09-04