Abstract
Fatigue tests have been carried out on edge notched mild steel specimens of various thicknesses. Results are presented showing the effect of thickness on crack initiation, crack growth and the geometry and fractography of the fracture surface. It was found that both crack initiation and crack growth were more rapid in the thinner specimens. The transition from a flat to a shear type of fracture was also dependent on thickness and the microscopic features of the fracture surfaces were different in the two modes. These effects are related to the state of stress at the crack tip and the conditions under which plane strain and plane stress obtain are determined.
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