Abstract
Effect of vibratory stress relief on titanium alloy Ti-6Al-4V fatigue life was investigated by numerical simulation method in this paper. This paper aimed to determine whether vibratory stress relief can adversely affect fatigue life of titanium alloy Ti-6Al-4V or not. Firstly, the modal analysis for titanium alloy Ti-6Al-4V specimen was carried out by using finite element method, then, using transient dynamic analysis method simulated specimen dynamic stress in vibratory stress relief process. Secondly, the finite element model that contained initial stress for VSR simulation was established. Vibratory stress relief was simulated by using transient dynamic analysis method. Finally, we used FE-safe software for fatigue simulation. It is concluded that titanium alloy Ti-6Al-4V fatigue strength increased with amplitude, but the phenomenon “much vibration” appeared when amplitude continued to increase that led to decrease of fatigue life.
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