J. Ocean Eng. Technol. Search

CLOSE


J. Ocean Eng. Technol. > Volume 25(6); 2011 > Article
J. Ocean Eng. Technol. 2011;25(6):49-55.    
DOI: https://doi.org/10.5574/KSOE.2011.25.6.049   

Variation of Rotating Bending Fatigue Characteristics by UNSM on Ti-6Al-4V
Suh Chang-Min,Pyoun Young-Sik,Suh Min-Soo
School of Mechanical Engineering Kyungpook National University,School of Mechanical Engineering Sun MoonUniversity,School of Advanced Materials Engineering Kookmin University
Ti-6Al-4V재의 UNSM처리에 의한 회전굽힘피로특성변화
서창민,편영식,서민수
경북대학교 공과대학 기계공학부,선문대학교 공과대학 기계공학부,국민대학교 공과대학 신소재공학부
© 2011 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Rotating bending fatigue test, S-N curve, Ultrasonic nanocrystal surface modification technology, Compressive residual stress
핵심용어: 회전굽힘피로시험, S-N 곡선, 초음파나노표면처리기술, 압축잔류응력
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%.


ABOUT
BROWSE ARTICLES
ARTICLE CATEGORY

Browse all articles >

PUBLICATION ETHICS
FOR CONTRIBUTORS
Editorial Office
President Office BD Rm. 1302, 13 Jungang-daero 180beon-gil, Dong-gu, Busan 48821, Republic of Korea
Tel: +82-51-759-0656    Fax: +82-51-759-0656    E-mail: ksoehj@ksoe.or.kr                

Copyright © 2025 by The Korean Society of Ocean Engineers.

Developed in M2PI

Close layer
prev next