Fatigue crack growth thresholds and crack propagation rates in the range of 10−8–10−14 m/cycle have been measured by means of 20 kHz stressing in copper, mild steel, and Type 304 steel. The existence of a stress intensity threshold is discussed. With the aid of a video attachment it has been shown that crack propagation is discontinuous, thus indicating that the microstructure has an important influence. Scanning electron microscopy studies of grain boundary cracks and fatigue striation spacings have confirmed this.
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