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http://dx.doi.org/10.5574/KSOE.2011.25.6.049

Variation of Rotating Bending Fatigue Characteristics by UNSM on Ti-6Al-4V  

Suh, Chang-Min (School of Mechanical Engineering, Kyungpook National University)
Pyoun, Young-Sik (School of Mechanical Engineering, Sun MoonUniversity)
Suh, Min-Soo (School of Advanced Materials Engineering, Kookmin University)
Publication Information
Journal of Ocean Engineering and Technology / v.25, no.6, 2011 , pp. 49-55 More about this Journal
Abstract
In order to analyze feasibility of replacing a conventional 6-mm Ti bar with a 5-mm bar, a series of rotating bending fatigue tests were carried out on Ti-6Al-4V bars by strengthening the fatigue performance using a special technique called UNSM (Ultrasonic Nanocrystal Surface Modification). The results of S-N curves clearly showed that the performance of the 5-mm titanium specimen was similar to that of the 6-mm specimen when the UNSM treatment was applied. The 5-mm treated specimen converged with small scattering band into the linear line of the non-treated 6-mm one. Below the fatigue life of $10^5$ cycles, the UNSM treatment did not show any significant superiority in the bending stress and fatigue life. However, over the fatigue life of $10^5$ cycles, the effect of UNSM was superior for each fatigue life, and the bending stress became longer and higher than that of the untreated one. In the case of 6-mm Ti-bar with UNSM, the fatigue limit was about 592 MPa, and there was fatigue strength increase of about 30.7% at the fatigue life of $10^4$ cycles compared to the untreated 6-mm bar. Therefore, the compressive residual stress made by the UNSM in Ti-6Al-4V increased the fatigue strength by more than 30%.
Keywords
Rotating bending fatigue test; S-N curve; Ultrasonic nanocrystal surface modification technology; Compressive residual stress;
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Times Cited By KSCI : 1  (Citation Analysis)
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