Stress measurement of SS400 steel beam using the continuous indentation technique |
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Authors: | Y -H Lee W -j Ji D Kwon |
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Affiliation: | (1) School of Materials Science and Engineering, Seoul National University, 151-742 Seoul, Korea |
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Abstract: | An analytical model is presented for determining surface residual stress using continuous indentation. The elastic residual
stress is assumed to have no influence on contact area or hardness and to be uniform over a volume that is several times larger
than the indentation mark. A step-by-step analysis for the residual-stress-induced load difference at a given depth is outlined
here and such concepts as stress interaction, stress-sensitive contact morphology, and reversible contact recoveries during
a stress relaxation are described. Finally, the proposed method is applied to the interpretation of the continuous indentation
results obtained from an SS400 steel beam in which controlled bending stresses are generated. The stress estimated, however,
showed a high scatter due to plastic pile-up deformation. When the optically measured contact area is used as an alternative
of the contact area calculated from the unloading curve, the re-evaluated stress agrees well with the already known applied
stress. |
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Keywords: | Residual stress continuous indentation stress interaction stress relaxation |
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