This study carried out uniaxial tension fatigue tests of Ti-6Al-4V focusing on sub-surface fractures in very high cycle regime. Crack growth properties in high vacuum were also investigated to simulate sub-surface crack propagation, which is kept away from atmosphere in principle. F racture surfaces were closely compared between the sub-surface crack and the crack propagated in vacuum. As a result, it was clarified that crack growth rate in vacuum was much lower than that in air, which corresponded to long...
英字タイトル:
A Mechanism of Sub-Surface Crack Growth in Very High Cycle Fatigue