International Journal of

ADVANCED AND APPLIED SCIENCES

EISSN: 2313-3724, Print ISSN: 2313-626X

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 Volume 7, Issue 6 (June 2020), Pages: 1-5

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 Original Research Paper

 Title: Effects of dwell time and loading/unloading rate on the nanoindentation behavior of polyethylene-based nanocomposites

 Author(s): Abdulaziz Salem Alghamdi 1, *, Mohamed Alashmawy 1, Mohamed Aichouni 2

 Affiliation(s):

 1Mechanical Engineering Department, College of Engineering, University of Hail, Ha’il, Saudi Arabia
 2Indusrial Engineering Department, College of Engineering, University of Hail, Ha’il, Saudi Arabia

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 * Corresponding Author. 

  Corresponding author's ORCID profile: https://orcid.org/0000-0002-1274-6454

 Digital Object Identifier: 

 https://doi.org/10.21833/ijaas.2020.06.001

 Abstract:

The purpose of this paper is to investigate the effects of parameters like loading, unloading rates, and dwell period on the depth-sensing indentation properties is. A bowing out or nose is the most common behavior for polymeric materials in nanoindentation tests due to the viscoelastic behavior. This leads to the negative slope and consequently, significant errors in the calculations of hardness and elastic modulus values using depth-sensing indentation techniques. A common practice to minimize this effect if to apply a creep at maximum indentation load or increase the unloading rates as considered in this work. The results showed that these parameters have significant impact on the nanoindentation hardness and elastic modulus. The hardness and elastic modulus increase with increasing the loading rate during nanoindentation testing. The elastic modulus values reduce significantly by increasing the unloading rate. Contrarily, hardness increase with increasing the unloading rate. Hardness and elastic modulus values are significantly affected by increasing the dwell period. The hardness reduces by 20% after increasing creep time and elastic modulus increases with increasing the dwell time. 

 © 2020 The Authors. Published by IASE.

 This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

 Keywords: Polymer, Polyethylene, Nanocomposite, Nanoindentation, Nanoparticle

 Article History: Received 8 December 2019, Received in revised form 28 February 2020, Accepted 29 February 2020

 Acknowledgment:

This study funded by Deanship of Scientific Research, University of Ha’il, Saudi Arabia (No. 160713, 2018).

 Compliance with ethical standards

 Conflict of interest: The authors declare that they have no conflict of interest.

 Citation:

 Alghamdi AS, Alashmawy M, and Aichouni M (2020). Effects of dwell time and loading/unloading rate on the nanoindentation behavior of polyethylene-based nanocomposites. International Journal of Advanced and Applied Sciences, 7(6): 1-5

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 Figures

 Fig. 1 Fig. 2 Fig. 3

 Tables

 Table 1 

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