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research-article

ABRASIVE WEAR OF POLYMER FIBERS INVESTIGATED BY RECIPROCAL SCRATCHING IN AN AFM

[+] Author and Article Information
Michael Giordano

Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN
mgiordano@orthopediatrics.com

Steven Schmid

Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN
Steven.R.Schmid.2@nd.edu

Mohammadreza Arjmandi

Department of Mechanical Engineering, Auckland University of Technology, Auckland, New Zealand
mohammadreza.arjmandi@aut.ac.nz

Maziar Ramezani

Department of Mechanical Engineering, Auckland University of Technology, Auckland, New Zealand
maziar.ramezani@aut.ac.nz

1Corresponding author.

ASME doi:10.1115/1.4037728 History: Received April 16, 2017; Revised August 09, 2017

Abstract

Three-dimensional woven fabrics have been considered by biomedical researchers to be used as load-bearing surfaces in joint and ligament replacements. In this regard, wear is a crucial phenomenon that determines material failure as well as biological response of body to wear debris. The current study evaluates various micro-scale screening methods with the aid of Atomic Force Microscopy (AFM) for biocompatible polymer fibers that are used in 3D woven fabrics. Fibers in mono and multifilament forms were subjected to indentation, scratching and line wear testing in dry and soaked conditions and the effect of key parameters such as applied normal load, sliding velocity and number of wear cycles were investigated. The area of worn material was determined by geometric approximation superimposed on the measured residual scratch of line wear. Moisture was found to lower the indentation hardness of some fibers while increased the hardness of others. Line wear results clearly suggest ultra-high molecular weight polyethylene (UHMWPE) to be the primary material for further investigation and that monofilament fibers should be avoided.

Copyright (c) 2017 by ASME
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