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Effects of angular misalignment on material property characterization by nanoindentation with a cylindrical flat-tip indenter

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Abstract

Nanoindentation techniques are commonly used to characterize nanomechanical properties of microscaled and nanoscaled materials. Nanoindentation using a cylindrical flat-tip indenter has a constant contact area which makes it a reliable source to find material’s yield strength as well as other mechanical properties. However, an angular misalignment of the indenter with the specimen results in experimental error. In this work, the effects of angular misalignment on the nanoindentation testing with a cylindrical flat-tip indenter were numerically analyzed. A three-dimensional nanoindentation solid model was generated, computer modeling based on finite element analysis was conducted. The angle of misalignment ranged from 0° to 1°. Young’s modulus and hardness were evaluated. Based on the hemispherical stress–strain distribution assumption of an elastic plastic indentation, corrected depths and modifiers were proposed for adjusting material’s 0.1% offset and 0.2% offset yield strengths. Low carbon steel AISI 1018 was selected as sample material for indentation testing and modeling validation.

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ACKNOWLEDGMENTS

The authors gratefully acknowledge generous support from the South Dakota Research Infrastructure Center Programs of Composite and Nanocomposite Advanced Manufacturing Center (CNAM) and the Materials Evaluation and Testing Lab (METLab), along with the Department of Mechanical Engineering at South Dakota State University. Help from Kevin Lynne for contacting nanoindentation tests and computational facility supported from University High Performance Computing at South Dakota State University are gratefully acknowledged.

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  1. Department of Mechanical Engineering, South Dakota State University, Brookings, SD, 57007, USA

    Naureen B. Shahjahan & Zhong Hu

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  1. Naureen B. Shahjahan
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  2. Zhong Hu
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Correspondence to Zhong Hu.

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Shahjahan, N.B., Hu, Z. Effects of angular misalignment on material property characterization by nanoindentation with a cylindrical flat-tip indenter. Journal of Materials Research 32, 1456–1465 (2017). https://doi.org/10.1557/jmr.2016.478

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  • DOI: https://doi.org/10.1557/jmr.2016.478

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