Abstract
Fatigue crack growth tests were carried out in order to give a unified explanation of the formal contradiction between two fatigue crack growth laws in small and large cracks, dl/dN∝σnl and dl/dN∝ΔKm. Cracks were monitored using the plastic replica method. Crack opening displacement ranges (ΔCOD 's) were measured from the positive metal replicas made from the plastic replicas. In small and large cracks having the same growth rate, the relationships between ΔCOD 's near the crack tips and the distance from the crack tip were almost the same. Therefore, ΔCOD near the crack tip can be considered as the main factor controlling the crack growth rate. Based on this, the two fatigue crack growth laws can be explained consistently.
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