Woodruff School of Mechanical Engineering
COE/Structural Mechanics Seminar
On Crack Initiation and Early Growth of Very-High-Cycle Fatigue for High Strength Steels
Dr. Youshi Hong
Institute of Mechanics, Chinese Academy of Sciences, Beijing, China
Friday, March 16, 2012 at 3:00:00 PM
MRDC Building, Room 4211
In the regime of Very-High-Cycle Fatigue (VHCF) for high strength steels, crack initiation and early growth dominate the fatigue life. The process of crack initiation and early growth of high strength steels at VHCF regime almost originates from the interior of the material with fish-eye embracing FGA or ODA. In this paper, fatigue tests on a high carbon chromium steel were performed with rotating bending and ultrasonic fatigue testing machines. The results show the dimensions of FGA and fish-eye as a function of inclusion size and reveal the correlation of the dimensions for FGA and fish-eye with fatigue failure cycles. The results also show the values of stress intensity factor ranges for FGA and fish-eye keep constant with fatigue failure cycles, which was used to estimate the fatigue life of high cycle and VHCF for high strength.
Youshi Hong (Ph.D) is a professor of the Institute of Mechanics (IMECH), Chinese Academy of Sciences (CAS). He was the Director of IMECH from June 1998 to June 2006 and is the Chairman of Academic Degree Committee of the institute. He is Editor-in-Chief for Fatigue & Fracture of Engineering Materials & Structures, Associate Editor-in-Chief for Science in China Series G and Advances in Mechanics. He is vice president of Chinese Society of Theoretical and Applied Mechanics. His research field is mechanical behavior of materials and structural mechanics. He has published 220 papers in academic journals and proceedings, and has been granted 11 patents.
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