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Tensile Properties of Hydroxyapatite Whisker Reinforced Polyetheretherketone

Published online by Cambridge University Press:  26 February 2011

Gabriel Converse  and
Ryan Roeder
Gabriel Converse
Affiliation:
gconvers@nd.edu, University of Notre Dame, Aerospace and Mechanical Engineering, 356 Fitzpatric Hall, Notre Dame, IN, 46556, United States, (574) 631-9122
Ryan Roeder
Affiliation:
rroeder@nd.edu, University of Notre Dame, Aerospace and Mechanical Engineering
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Abstract

Polyetheretherketone (PEEK) was reinforced with 0-40 vol% hydroxyapatite (HA) whiskers using a novel powder processing and compression molding technique. A powder mixture was uniaxially pressed into a composite powder compact and compression molded into a flat composite bar using an open-channel die, such that the HA whiskers exhibited a preferred orientation along the length of the bar and tensile specimens. As expected, increased HA whisker reinforcement resulted in increased elastic modulus, but decreased ultimate tensile strength and strain- or work-to-failure. PEEK reinforced with 40 vol% HA whiskers exhibited an elastic modulus of 16-18 GPa. PEEK reinforced with 20 vol% HA whiskers had an ultimate tensile strength of 70-80 MPa. Human cortical bone exhibits an elastic modulus of 17-26 GPa and an ultimate tensile strength of 80-150 MPa in the longitudinal direction (direction of principal stress). Stiffness coefficients measured by ultrasonic wave propagation indicated a level orthotropy also similar to that of human cortical bone tissue.

Keywords

bonecompositepolymer
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 898: Symposium L – Mechanical Behavior of Biological and Biomimetic Materials , 2005 , 0898-L05-07
Copyright
Copyright © Materials Research Society 2006

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