Abstract
Purushotaman and Tien(1) found that the crack growth rate in a monocrystalline Ni-base alloy did not exhibit threshold behavior at low stress intensities when crack propagation was performed by 20 kHz ultrasonic stressing. However, thresholds were found for polycrystalline materials (copper, iron, steel) tested in a noncorrosive silicon oil environment (2). Also the influence of corrosive salt water was studied (3). The results of these experiments suggested the use of monocrystals in order to exclude the influence of grain boundaries and to reveal the influence of orientation on crack growth behavior at very low stress intensities•
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