Investigation Into Cumulative Damage Rules to Predict Fretting Fatigue Life of Ti-6Al-4V Under Two-Level Block Loading Condition

[+] Author and Article Information
O. Jin, H. Lee

Department of Aeronautics and Astronautics, Air Force Institute of Technology, Wright-Patterson AFB, OH 45433-7765, USA

S. Mall

Materials and Manufacturing Directorate (AFRL/MLLMN), Air Force Research Laboratory, Wright-Patterson AFB, OH 45433-7817, USA

J. Eng. Mater. Technol 125(3), 315-323 (Jul 10, 2003) (9 pages) doi:10.1115/1.1590998 History: Received December 30, 2002; Revised April 15, 2003; Online July 10, 2003
Copyright © 2003 by ASME
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Microstructure of Ti-6Al-4V
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Schematic drawing of (a) specimen; and (b) pad.
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Schematic drawing of fretting fatigue setup used in the present study
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Schematic drawing of various two-level block loading profiles for (a) Hi-Lo loading; (b) Lo-Hi loading; and (c) repeated block loading.
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Plot of stress versus failure lives at P=3567 N using nominal stress range and effective stress
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Experimental results and predicted damage fractions using linear (LDR) and nonlinear damage rules (NLDR), damage curve analysis (DCA) and double linear damage rule (DLDR)
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Plot of damage fractions (n2/Nf,2) at lower stress amplitude versus those (n1/Nf,1) at higher stress amplitude for the data obtained from Refs. 121314 and the present work and also predictions from NLDR and DLDR
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Plot of predicted failure lives using LDR, DCA, and DLDR for various repeated two-level block loading
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Comparison of S-N curve between constant and variable amplitude loading at (a) P=1334 N; and (b) P=3567 N.
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Fracture surface of specimens subject to Hi-Lo loading after (a) n1=47,300 cycles; and (b) n1=62,000 cycles.
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Fracture surface of the specimen tested at Lo-Hi loading
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Fractured surface of specimen exposed to a repeated two-level loading n1=3000 and n2=3000 cycles. (a) overall fractured surface. Arrows indicate crack initiation sites, and o and x shows inside band and between bands; (b) region inside band; and (c) region between two bands.  




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