In fracture mechanics, there are several test specimen, such as the C(T) specimen, and when assessing the crack growth behoavior, to determine the threshold stress intensity factor, a precrack is needed prior to perform the crack propagation test?
Fracture mechanics is a branch of solid mechanics. It analyzes a solid body with a sharp crack, i.e., a mathematical sharp crack tip with zero radius. The stress in the brittle material at the crack tip is infinite theoretically. A machined notch has a well defined corner radius and the notch tip is not sharp enough to be a crack tip. Even use standard EDM, the notch radius would be about 0.15mm. You need to create a natural, sharp crack in CT specimen to get valid fracture toughness. Refer to ASTM E1820 for test procedure.
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