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Nano-indentation response of ultrahighmolecular weight polyethylene (UHMWPE)

A detailed analysis

Journal Article (2020)
Author(s)

Tanveer Iqbal (University of Engineering & Technology Lahore)

S. S. Camargo (Universidade Federal do Rio de Janeiro)

Saima Yasin (University of Engineering & Technology Lahore)

U. Farooq (TU Delft - Aerospace Manufacturing Technologies)

Ahmad Shakeel (University of Engineering & Technology Lahore, TU Delft - Rivers, Ports, Waterways and Dredging Engineering)

Research Group
Aerospace Manufacturing Technologies
Copyright
© 2020 Tanveer Iqbal, S. S. Camargo, Saima Yasin, U. Farooq, A. Shakeel
DOI related publication
https://doi.org/10.3390/POLYM12040795
More Info
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Publication Year
2020
Language
English
Copyright
© 2020 Tanveer Iqbal, S. S. Camargo, Saima Yasin, U. Farooq, A. Shakeel
Research Group
Aerospace Manufacturing Technologies
Issue number
4
Volume number
12
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Abstract

Nano-indentation, a depth sensing technique, is a useful and exciting tool to investigate the surface mechanical properties of a wide range of materials, particularly polymers. Knowledge of the influence of experimental conditions employed during nano-indentation on the resultant nano-mechanical response is very important for the successful design of engineering components with appropriate surface properties. In this work, nano-indentation experiments were carried out by selecting various values of frequency, amplitude, contact depth, strain rate, holding time, and peak load. The results showed a significant effect of amplitude, frequency, and strain rate on the hardness and modulus of the considered polymer, ultrahigh molecular weight polyethylene (UHMWPE). Load-displacement curves showed a shift towards the lower indentation depths along with an increase in peak load by increasing the indentation amplitude or strain rate. The results also revealed the strong dependence of hardness and modulus on the holding time. The experimental data of creep depth as a function of holding time was successfully fitted with a logarithmic creep model (R2 ≥ 0.98). In order to remove the creeping effect and the nose problem, recommended holding times were proposed for the investigated polymer as a function of different applied loads.