Residual stress measurement via digital image correlation and sharp indentation testing

Jinlong Chen; Jihua Liu; Cuiru Sun

doi:10.1117/1.OE.55.12.124102

15 December 2016 Residual stress measurement via digital image correlation and sharp indentation testing

Jinlong Chen, Jihua Liu, Cuiru Sun

Author Affiliations +

Optical Engineering, Vol. 55, Issue 12, 124102 (December 2016). https://doi.org/10.1117/1.OE.55.12.124102

Abstract

An optical and semidestructive method to determine surface residual stress, which combines digital image correlation (DIC) with sharp indentation testing, is proposed. Based on the expanding cavity model, when a semi-infinite body is subjected to uniform equi-biaxial residual or applied stresses, the surface displacement around the indentation satisfies radial profiles. Therefore, the relation between the radial displacement and the residual or applied stresses on the surface of a semi-infinite body can be determined. The described relation was tested using indentation experiments for different applied stress states in aluminum. These states were generated using a stress-generating setup with two independent orthogonal loading axes. DIC was used to measure the displacement. The magnitude of the residual stress was obtained using nonlinear curve fitting based on theoretical analysis, as well as linear curve fitting since the experimental data almost had a linear relationship. The calculations are in good agreement with the values of applied stresses.

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Jinlong Chen, Jihua Liu, and Cuiru Sun "Residual stress measurement via digital image correlation and sharp indentation testing," Optical Engineering 55(12), 124102 (15 December 2016). https://doi.org/10.1117/1.OE.55.12.124102

Published: 15 December 2016

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