Abstract
Laser notched and pre-cracked freestanding diamond film samples were tested under cyclic loading in three point bending using a fatigue machine incorporated with the SEM(550)-SERVO scanning electron microscope. Stable crack growth was observed in situ. Crack growth was found to be discontinuous; there was generally a break after each growth. It was found that the minimum cyclic load at the first stable crack growth was approximately 60% of the fracture load for the notched sample under static loading. The minimum cyclic load for the ultimate brittle fracture was about 74% of the fracture load for the notched sample. Mechanisms for the observed stable crack growth in freestanding diamond film samples under cyclic loading are discussed. The columnar grain feature of the freestanding diamond films and the grain boundary may be responsible for the stable crack growth under cyclic loading.
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