High cycle fatigue behavior of implant Ti-6Al-4V in air and simulated body fluids
Long term fatigue behavior of Ti-6Al-4V which is widely used in biomedical applications has been investigated.Constant stress amplitude fatigue experiments (S-N curves) were carried out at ultrasonic frequency (20 kHz) with two different surface conditions (ground surface and polished surface) in ambient air and in a corrosive fluid similar to body fluid.It is found that the improvement of fatigue strength is pronounced for polished specimens below 106 cycles in ambient air due to fatigue cracks initiate from surfaces of specimens at high stress amplitudes,while surface conditions have no effect on fatigue behaviors of the material because the defects located within the specimen become favorable sites for crack initiation.The endurance limit at 108 cycles of polished Ti-6Al-4V specimens decreased by 7% if it was cycled in simulated body fluid instead of ambient air.Fracture surfaces show all fatigue failure initiated from surfaces in simulated body fluid.
Ti-6Al-4V alloy High cycle fatigue surface condition simulated body fluid S-N curve fatigue crack initiation
Liu Yongjie Yang Shaobo Wang Qingyuan
Department of Mechanics and Engineering Science, Sichuan University, Chengdu 610065, China
国际会议
上海
英文
176-176
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）