Life Prediction of Fretting Fatigue of Ti-6Al-4V

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Volume 3, Issue 7 (July 2006)

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ISSN: 1546-962X
Page Count: 9

Life Prediction of Fretting Fatigue of Ti-6Al-4V
Jin, O
Assistant Professor, School of Engineering, Mercer University, GA

Calcaterra, JR
Senior Materials Engineer, Materials & Manufacturing Directorate, U.S. Air Force Research Laboratory, OH

Mall, S
Professor, U.S. Air Force Institute of Technology, OH

(Received 2 May 2005; accepted 5 April 2006)

Abstract

The present study was aimed towards improving the prediction capability of fretting fatigue life of Ti-6Al-4V. Incremental and interrupted fretting fatigue tests were conducted. Based on the crack propagation pattern observed on the fractured surface fretting fatigue life was predicted. The disappearance of contact stresses was evidenced by the change in crack growth direction from oblique to perpendicular path to the loading direction. Thus, fatigue crack initially propagated under the influence of the contact stress, and then it grew due to the applied stress amplitude to the substrate. The transition crack length between these two conditions varied between 20 to 30 μm and depended on the contact load. This enabled the prediction of short and long crack propagation life. There was good correlation between the predicted fretting fatigue life and the experimental life.

Keywords:
fretting fatigue, life prediction, Ti-6Al-4V

Paper ID: JAI100346
DOI: 10.1520/JAI100346
ASTM International is a member of CrossRef.

Author Title Life Prediction of Fretting Fatigue of Ti-6Al-4V Symposium Presented at ASTM Symposium on Fatique and Fracture Mechanics: 35th Volume, 2005-05-20 Committee E08

		Home Journals STPs Manuals Topics Subscriptions/Pricing Digital Library / Journals / Journal of ASTM International (JAI) / Citation Page Volume 3, Issue 7 (July 2006) Click here to download this paper now for $25 PDF (368K) View License Agreement ISSN: 1546-962X Page Count: 9 Life Prediction of Fretting Fatigue of Ti-6Al-4V Jin, O Assistant Professor, School of Engineering, Mercer University, GA Calcaterra, JR Senior Materials Engineer, Materials & Manufacturing Directorate, U.S. Air Force Research Laboratory, OH Mall, S Professor, U.S. Air Force Institute of Technology, OH (Received 2 May 2005; accepted 5 April 2006) Abstract The present study was aimed towards improving the prediction capability of fretting fatigue life of Ti-6Al-4V. Incremental and interrupted fretting fatigue tests were conducted. Based on the crack propagation pattern observed on the fractured surface fretting fatigue life was predicted. The disappearance of contact stresses was evidenced by the change in crack growth direction from oblique to perpendicular path to the loading direction. Thus, fatigue crack initially propagated under the influence of the contact stress, and then it grew due to the applied stress amplitude to the substrate. The transition crack length between these two conditions varied between 20 to 30 μm and depended on the contact load. This enabled the prediction of short and long crack propagation life. There was good correlation between the predicted fretting fatigue life and the experimental life. Keywords: fretting fatigue, life prediction, Ti-6Al-4V Paper ID: JAI100346 DOI: 10.1520/JAI100346 ASTM International is a member of CrossRef. Author Title Life Prediction of Fretting Fatigue of Ti-6Al-4V Symposium Presented at ASTM Symposium on Fatique and Fracture Mechanics: 35th Volume, 2005-05-20 Committee E08