Abstract
This work addresses the mode I fatigue crack propagation behaviours of pure Ti foils using freestanding notched rectangular specimens under tension-tension cyclic loading. Compared to the 50-μm-thick foil, the 30-μm-thick foil exhibited a higher yield strength (σy) but a lower fracture toughness (KQ) and fatigue life (Nf) for the same loading conditions. The Paris constant m decreased from 5.12 to 4.45, when the foil thickness increased from 30 μm to 50 μm. The incomplete self-similarity parameter Z at the crack tip was found to be higher in the 30-μm-thick foils, resulting in a higher Paris constant m than that in the 50-μm-thick foils.
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