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TECHNICAL PAPERS

Effects of Shot-Peening on Fretting-Fatigue Behavior of Ti-6Al-4V

[+] Author and Article Information
S. A. Namjoshi

Department of Aeronautics and Astronautics, Air Force Institute of Technology (AFIT/ENY), Building 640, 2950 P Street, Wright-Patterson Air Force Base, OH 45433-7765

V. K. Jain

Mechanical and Aerospace Engineering Department, University of Dayton, Dayton, OH 45469-0210

S. Mall

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

J. Eng. Mater. Technol 124(2), 222-228 (Mar 26, 2002) (7 pages) doi:10.1115/1.1448323 History: Received February 07, 2001; Revised October 25, 2001; Online March 26, 2002
Copyright © 2002 by ASME
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References

Figures

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Schematic of fretting test frame, fretting specimen and pads
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Variation of σxx with x/a in the top layer of fretting fatigue specimen. Loading conditions: axial stress=547 MPa;Q=158 N;P=1335 N; coefficient of friction=0.33
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Plot of compressive residual stress produced by shot-peening as function of the specimen depth
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Variation of experimentally determined residual compressive stress due to shot-peening and the compensatory tensile stress as obtained by curve fitting
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Experimental fatigue life data versus applied stress range and numerical fits to this data for as-received (fretting-fatigue), shot-peened (fretting-fatigue), and as-received plain-fatigue specimen
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Schematic of gage section of dogbone specimen showing fracture surface(s) and fretting scar on a failed specimen
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Scanning electron micrograph of fracture surface of specimen #25 from Table 1 (loading condition same as in Fig. 3)
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SEM micrograph of the fracture surface showing presence of striations on the fracture surface (loading condition same as in Fig. 3)
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Optical micrograph of fretting scar on specimen surface showing crack initiation site (loading condition same as in Fig. 3)
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Plot of σeffective versus fatigue life for as-received (fretting-fatigue), shot-peened (fretting-fatigue) and as-received (plain-fatigue) specimens
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Plot of σeffective versus fatigue life for shot-peened (fretting-fatigue) with consideration of residual tensile stress and as-received (plain-fatigue) specimens

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