Determination of elastic moduli of polymeric materials using microhardness indentation.

Autor: Titus R; Department of Biomedical Materials Science, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216-4505, USA. Electronic address: rtitus@umc.edu., Satpathy M; Research and Development, Prismatik Dentalcraft Inc., 17644 Daimler St, Irvine, CA 92614, USA. Electronic address: megha.satpathy@glidewelldental.com., Mecholsky JJ Jr; Department of Materials Science and Engineering, University of Florida, Rhines Hall, Gainesville, FL, 32603, USA. Electronic address: jmech@mse.ufl.edu., Jodha KS; Department of Biomedical Materials Science, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216-4505, USA. Electronic address: kjodha@umc.edu., Abdulhameed N; College of Dentistry, University of Florida, 1395 Center Dr, Gainesville, FL, 32610, USA. Electronic address: nadera@dental.ufl.edu., Griggs JA; Department of Biomedical Materials Science, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216-4505, USA. Electronic address: jgriggs@umc.edu.
Jazyk: angličtina
Zdroj: Journal of the mechanical behavior of biomedical materials [J Mech Behav Biomed Mater] 2024 Dec; Vol. 160, pp. 106713. Date of Electronic Publication: 2024 Sep 03.
DOI: 10.1016/j.jmbbm.2024.106713
Abstrakt: Young's modulus of elasticity (or stiffness, E) is an important material property for many applications of polymers and polymer-matrix composites. The common methods of measuring E are by measuring the velocity of ultrasonic pulses through the material or by resistance to flexure, but it is difficult for ultrasound to penetrate polymers that contain filler particles, and flexural measurements require large specimens that may not mimic the clinical case. Thus, it may be difficult to determine E using conventional techniques. It would be useful to have a relatively rapid technique that could be applied to small specimens, highly filled materials, and even specimens cured in situ. We suggest using a microhardness indentation technique that was originally developed for ceramic materials. We tested two unfilled rigid polymers, four resin composites, and four unfilled polymers with lesser hardness for this study. The study found that greater Vickers hardness loads yielded more consistent results than lesser loads. We developed a modified equation for E based on Knoop microhardness indentations. We concluded that laboratories may use a microhardness indenter to estimate the elastic moduli of polymers and resin composites. The results support our initial hypotheses that the slope of the equation relating the indentation parameter and the hardness/elastic modulus ratio was different for polymers and resin composites than for ceramics; however, the intercept is the same irrespective of the material tested.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: