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Figure 4


Fig. 4. A log–log plot illustrating patterns of crack growth for conditions of repeated loading. Crack growth rate (mm cycle-1), da/dN, indicates the increase in crack length for each cycle, N, of sinusoidally varying applied stress. Stress intensity range Formula 7, {Delta}KI indicates the variation in stress intensity factor during each cycle of loading. {Delta}KTH indicates threshold stress intensity factor range, and KC denotes fracture toughness.