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Directionality of residual stress evaluated by instrumented indentation testing using wedge indenter

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Abstract

In instrumented indentation testing (IIT), residual stress can be evaluated by shift in indentation load-depth curves for stress-free and stressed states. Although the average surface residual stress is able to be evaluated with Vickers indenter, in order to know stress directionality, another indentation tests with two-fold symmetric indenter, for example, Knoop indenter, are needed. As some necessities for evaluating nonequibiaxial residual stress within small indent area, we suggest a novel way to evaluate directionality of residual stress, p, using wedge indenter characterized by two parameters, edge length and inclined angle. We develop wedge-indentation-mechanics model based on predetermined conversion factors which are determined by IITs for various uniaxial stressed states combining with finite element analysis simulations. By utilizing the developed model, directionality of residual stress is evaluated through two serial wedge IITs with respect to principal directions. We find good agreements between applied residual stress and residual stress evaluated by the developed model for biaxial tensile stress states.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea

    Hee-Jun Ahn, Jong-hyoung Kim, Huiwen Xu, Junsang Lee & Dongil Kwon

  2. School of Materials Science and Engineering, UNIST (Ulsan National Institute of Science and Technology), Ulsan, 44919, Republic of Korea

    Ju-Young Kim

  3. Mechanical Safety Technology Center, System Convergence Technology Division, KTL (Korea Testing Laboratory), Jinju, 52852, Republic of Korea

    Young-Cheon Kim

Authors
  1. Hee-Jun Ahn
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  2. Jong-hyoung Kim
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  3. Huiwen Xu
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  4. Junsang Lee
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  5. Ju-Young Kim
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  6. Young-Cheon Kim
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  7. Dongil Kwon
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Correspondence to Young-Cheon Kim.

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Ahn, HJ., Kim, Jh., Xu, H. et al. Directionality of residual stress evaluated by instrumented indentation testing using wedge indenter. Met. Mater. Int. 23, 465–472 (2017). https://doi.org/10.1007/s12540-017-6573-4

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  • DOI: https://doi.org/10.1007/s12540-017-6573-4

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