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TECHNICAL PAPERS

Fatigue Life Prediction After Laser Forming

[+] Author and Article Information
J. Zhang, D. Pirzada, G. J. Cheng

School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99163

C. C. Chu

Ford Research Lab, Dearborn, MI 48124

J. Manuf. Sci. Eng 127(1), 157-164 (Mar 21, 2005) (8 pages) doi:10.1115/1.1828059 History: Received October 01, 2003; Revised April 28, 2004; Online March 21, 2005
Copyright © 2005 by ASME
Topics: Lasers , Fatigue life , Stress
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References

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Maher, W., 1998, “Laser Forming of Titanium and other Materials is Usable Within Metallurgical Constraints,” Proceedings of ICALEO’ 98, Section E, Orlando, FL, pp. 121–129.
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Figures

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Schematic view of (a) Geometry of workpiece and coordinate system (b) dimension of fatigue testing specimen
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Superposition of cooling time history of laser forming from FEM results on CCT curve of AISI 1012 steel 22
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Residual stress distribution on the Y-Z cross section of the specimen (p=800 W,v=0.05 m/s). (a) Residual strain contour and (b) residual stress distribution in Y direction on the top surface.
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Residual strain distribution on the Y-Z cross section of the specimen (p=800 W,v=0.05 m/s). (a) Residual strain contour and (b) residual strain distribution in the Y direction on the laser-forming surface.
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Fatigue life distribution on the Y-Z cross section (p=800 W,v=0.05 m/s). (a) Fatigue life contour and (b) fatigue life distribution in the Y-axis direction on the top surface
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(a) Schematic of typical regions on the Y-Z cross section of AISI1010 steel sheet after laser forming and (b) SEM micrograph (×80) on the Y-Z cross section, perpendicular to the scanning path, showing the heat affected zone, nonheat affected zone, and the boundary of HAZ and non-HAZ
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SEM micrographs (×200) of cracks on the surface of laser formed AISI1010 steel sheet after fatigue testing. (a) Crack on the heat-affected zone and (b) the end of the crack and a second crack, showing the crack is initiated around the boundary of HAZ and propagates toward the center of the sample.
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SEM micrographs (×40) of cross section of laser formed AISI1010 steel sheet after fatigue testing. (a) Dark zone is heat-affected zone and (b) white region is the region where the material broke last.
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SEM micrographs (×1000) of laser formed AISI1010 steel sheet after fatigue testing. (a) Heat-affected zone, (b) interface of heat-affected zone and nonheat-affected zone, and (c) nonheat-affected zone.
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SEM micrographs (×2000) around the boundary of HAZ of laser formed AISI1010 steel sheet after fatigue testing, revealing that a crack initiates on the boundary of HAZ and propagates along the boundary
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Comparison of experimental results and predictions on fatigue life of AISI1010 sheet after laser forming versus laser scanning velocity under difference laser heating power levels
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Comparison of experimental results and predictions on fatigue life of AISI1010 sheet after laser forming versus laser heating power under different laser scanning velocities

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