Abstract
Abstract— Multiple underloads and overloads with constant ΔK were carried out on centre‐cracked tension specimens. It was found that when shear lips develop, underloads or overloads affect the crack growth rate da/dN and the subsequent retardation. The appearance of the shear lip fracture surfaces depends on the frequency. At higher frequencies a greater number of rough shear lip fracture surfaces will develop, while at lower frequencies there is a tendency towards smooth shear lips. The amount of crack closure differs in each case. It was found that the type of shear lip, rough or smooth, can be related to the effect on da/dN during and after underloads. The effect of rough and smooth shear lip growth was investigated in constant ΔK tests, performing these tests with and without crack closure.
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