Volume 7, Issue 6 (June 2020), Pages: 1-5
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
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
Full Text - PDF XML
* Corresponding Author.
Corresponding author's ORCID profile: https://orcid.org/0000-0002-1274-6454
Digital Object Identifier:
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
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.
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
Permanent Link to this page
Fig. 1 Fig. 2 Fig. 3
- Aldousiri B, Dhakal HN, Onuh S, Zhang ZY, and Bennett N (2011). Nanoindentation behavior of layered silicate filled spent polyamide-12 nanocomposites. Polymer Testing, 30(6): 688-692. https://doi.org/10.1016/j.polymertesting.2011.05.008 [Google Scholar]
- Alghamdi AS (2017). Nanoparticle type effects on the scratch resistance of polyethylene-based nanocomposites. International Journal of Advanced and Applied Sciences, 4(4): 1-6. https://doi.org/10.21833/ijaas.2017.04.001 [Google Scholar]
- Alghamdi AS (2019). Creep resistance of polyethylene-based nanocomposites. Engineering, Technology and Applied Science Research, 9(4): 4367-4370. [Google Scholar]
- Altaf K, Ashcroft IA, and Hague R (2012). Modelling the effect of moisture on the depth sensing indentation response of a stereolithography polymer. Computational Materials Science, 52(1): 112-117. https://doi.org/10.1016/j.commatsci.2011.01.051 [Google Scholar]
- Briscoe BJ, Fiori L, and Pelillo E (1998). Nano-indentation of polymeric surfaces. Journal of Physics D: Applied Physics, 31(19): 2395-2405. https://doi.org/10.1088/0022-3727/31/19/006 [Google Scholar]
- Cheng L, Xia X, Scriven LE, and Gerberich WW (2005a). Spherical-tip indentation of viscoelastic material. Mechanics of Materials, 37(1): 213-226. https://doi.org/10.1016/j.mechmat.2004.03.002 [Google Scholar]
- Cheng YT, Ni W, and Cheng CM (2005b). Determining the instantaneous modulus of viscoelastic solids using instrumented indentation measurements. Journal of Materials Research, 20(11): 3061-3071. https://doi.org/10.1557/JMR.2005.0389 [Google Scholar]
- Chudoba T and Richter F (2001). Investigation of creep behavior under load during indentation experiments and its influence on hardness and modulus results. Surface and Coatings Technology, 148(2-3): 191-198. https://doi.org/10.1016/S0257-8972(01)01340-8 [Google Scholar]
- Fischer-Cripps AC (2002). Nanoindentation. Springer-Verlag New York, Inc., New York, USA. https://doi.org/10.1007/978-0-387-22462-6 [Google Scholar]
- Humbert S, Lame O, and Vigier G (2009). Polyethylene yielding behavior: What is behind the correlation between yield stress and crystallinity? Polymer, 50(15): 3755-3761. https://doi.org/10.1016/j.polymer.2009.05.017 [Google Scholar]
- Lu YC, Tandon GP, Jones DC, and Schoeppner GA (2009). Elastic and viscoelastic characterization of thermally-oxidized polymer resin using nanoindentation. Mechanics of Time-Dependent Materials, 13(3): 245-260. https://doi.org/10.1007/s11043-009-9088-7 [Google Scholar]
- Ngan AHW and Tang B (2002). Viscoelastic effects during unloading in depth-sensing indentation. Journal of Materials Research, 17(10): 2604-2610. https://doi.org/10.1557/JMR.2002.0377 [Google Scholar]
- Oliver WC and Pharr GM (1992). An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments. Journal of Materials Research, 7(6): 1564-1583. https://doi.org/10.1557/JMR.1992.1564 [Google Scholar]
- Oyen ML and Cook RF (2003). Load–displacement behavior during sharp indentation of viscous–elastic–plastic materials. Journal of Materials Research, 18(1): 139-150. https://doi.org/10.1557/JMR.2003.0020 [Google Scholar]
- Wang ZZ, Gu P, and Zhang Z (2010). Indentation and scratch behavior of nano-SiO2/polycarbonate composite coating at the micro/nano-scale. Wear, 269(1-2): 21-25. https://doi.org/10.1016/j.wear.2010.03.003 [Google Scholar]
- Yang S, Zhang YW, and Zeng K (2004). Analysis of nanoindentation creep for polymeric materials. Journal of Applied Physics, 95(7): 3655-3666. https://doi.org/10.1063/1.1651341 [Google Scholar]
- Yasin S, Shakeel A, Iqbal T, Ahmad F, Mehmood H, Luckham PF, and Ullah N (2019). Effect of experimental conditions on nano-indentation response of low density polyethylene (LDPE). Journal of Macromolecular Science, Part A, 56(7): 640-647. https://doi.org/10.1080/10601325.2019.1593791 [Google Scholar]
- Yusoh K, Jin J, and Song M (2010). Subsurface mechanical properties of polyurethane/organoclay nanocomposite thin films studied by nanoindentation. Progress in Organic Coatings, 67(2): 220-224. https://doi.org/10.1016/j.porgcoat.2009.10.003 [Google Scholar]