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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

Published online by Cambridge University Press:  10 January 2020

Jongho Won ,
Seunggyu Kim ,
Oh Min Kwon ,
Young-Cheon Kim  and
Dongil Kwon
Jongho Won
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea; and Centre for Advanced Innovation Technologies (CPIT), VSB-Technical University of Ostrava, Ostrava 70800, Czech Republic
Seunggyu Kim
Affiliation:
Facility Team, Samsung Electronics, Hwaseong 18448, Korea
Oh Min Kwon
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
Young-Cheon Kim*
Affiliation:
Research Center for Energy and Clean Technology, School of Materials Science and Engineering, Andong National University, Andong, Gyeongbuk 36729, Korea
Dongil Kwon
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
*
a)Address all correspondence to this author. e-mail: kimyc@anu.ac.kr
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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.

Keywords

polymerhardnessstrength

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Type
Article
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Journal of Materials Research , Volume 35 , Issue 2 , 28 January 2020 , pp. 206 - 214
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Copyright
Copyright © Materials Research Society 2020

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Footnotes

b)

These authors contributed equally to this work.

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