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Prediction of residual stress components and their directions from pile-up morphology: An experimental study

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Abstract

Indentation method has been widely used in the measurement of material mechanical properties and residual stress for its simple, fast and nondestructive characteristics. In the indentation test, because of the plastic deformation of the material, the material accumulation and subsidence occurs around the indentation. It is found that the deformation amount of the indentation, especially the maximum pile-up around the indentation after unloading, is related to the magnitude and direction of the residual stress. In this paper, an experimental study on the pile-up morphology around an indentation for determining the direction and magnitude of residual stress is reported. Nonsymmetrical morphology of spherical indenting deformation on artificially strained steel specimen was measured with a laser scanning confocal system. A unique relationship between pile-up after unloading and biaxial residual stress was set up based on the experimental results. The direction and components of nonequibiaxial residual stress can be determined by the proposed method.

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ACKNOWLEDGMENTS

This work was financially supported by the NSFC (Nos 11272131, 11472114).

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Authors and Affiliations

  1. Department of Mechanics, Huazhong University of Science and Technology, Wuhan, 430074, China

    Lei Shen, Yuming He, Dabiao Liu, Meng Wang & Jian Lei

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  1. Lei Shen
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  2. Yuming He
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  3. Dabiao Liu
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  4. Meng Wang
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Correspondence to Yuming He.

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Shen, L., He, Y., Liu, D. et al. Prediction of residual stress components and their directions from pile-up morphology: An experimental study. Journal of Materials Research 31, 2392–2397 (2016). https://doi.org/10.1557/jmr.2016.270

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