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Evaluation of tensile yield strength of high-density polyethylene in flat-ended cylindrical indentation: An analytic approach based on the expanding cavity model

  • Nanomechanics and Testing
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Abstract

The tensile yield strength of high-density polyethylene using instrumented indentation tests with a flat-ended cylindrical indenter was evaluated. The variation in the field expressed by stress and strain beneath the flat-ended cylindrical indenter is investigated using a new expanding cavity model to study the relation between tension and indentation. This model starts from the separation of forces into the compressive force on the material and the frictional one, which is generated during indentation on the sides of indenter. The authors propose a method to correct the frictional force based on the saturation of indentation hardening and obtain load–depth curve with compressive component only. For conversion of indentation force and displacement, our new representation model is applied. By modifying Johnson’s model, the new assumption of conservation of indentation plastic volume is suggested. This model proves and supports conventional relations of the strain rates between indentation and tension theoretically. These are verified through the experiments: instrumented indentation and uniaxial tensile test. The authors find a good agreement between the tensile yield strengths at various strain rates.

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Acknowledgments

This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. NRF-2015R1A5A1037627) and Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No. NRF-2018R1D1A3B07048712).

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  1. These authors contributed equally to this work.

Authors and Affiliations

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

    Jongho Won, Oh Min Kwon & Dongil Kwon

  2. Centre for Advanced Innovation Technologies (CPIT), VSB-Technical University of Ostrava, Ostrava, 70800, Czech Republic

    Jongho Won

  3. Facility Team, Samsung Electronics, Hwaseong, 18448, Korea

    Seunggyu Kim

  4. Research Center for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University, Andong, Gyeongbuk, 36729, Korea

    Young-Cheon Kim

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  1. Jongho Won
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  2. Seunggyu Kim
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  3. Oh Min Kwon
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Correspondence to Young-Cheon Kim.

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Won, J., Kim, S., Kwon, O.M. et al. Evaluation of tensile yield strength of high-density polyethylene in flat-ended cylindrical indentation: An analytic approach based on the expanding cavity model. Journal of Materials Research 35, 206–214 (2020). https://doi.org/10.1557/jmr.2019.387

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