Residual Stress Measurement in a Ceramic-Metallic Graded Material

[+] Author and Article Information
Michael R. Hill, Wei-Yan Lin

Mechanical and Aeronautical Engineering Department, University of California, Davis, CA 95616e-mail: mrhill@ucdavis.edu

J. Eng. Mater. Technol 124(2), 185-191 (Mar 26, 2002) (7 pages) doi:10.1115/1.1446073 History: Received March 15, 2001; Revised August 22, 2001; Online March 26, 2002
Copyright © 2002 by ASME
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(a) Location of samples in larger FGM plate and (b) measurement locations shown with exaggerated sample irregularity
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Coordinates and strain gage locations for the slotting experiments
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Finite element mesh for a plane strain, symmetric model for slotting at location 7-3. Slot depth is increased by removing elements in the right-most layer in succession from top to bottom.
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Strain release at the four slot locations, (a) Top gage, (b) bottom gage
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Residual stress at all locations, error bars for location 8-1
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Measured strain for location 8-1 and strain fit from a tenth order stress expansion
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Global error in strain fit versus stress expansion order for location 8-1
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Uncertainty in estimated stress, location 8-1, (a) Global, (b) pointwise
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The influence of including the top gage on (a) strain-fit error and (b) stress uncertainty



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