Artifactual nonlinearity due to wear grooves and friction in four-point bending experiments of cortical bone

L. V. Griffin, J. C. Gibeling, V. A. Gibson, R. B. Martin, Susan M Stover

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Experiments and analyses were performed to determine the cause of a nonlinear force-deflection response observed in four-point flexural fatigue of beams of cortical bone machined from the mid-diaphysis of the equine third metacarpus. Observable grooves which formed on the beam surface at supports and load noses were found to be the primary cause of the nonlinearity. An additional geometric nonlinearity at large deflections revealed by finite element modeling may be minimized by using the smallest diameter supports and load noses recommended in ASTM 790. However, frictional constraint of the beams at the load noses and supports can occur at low load levels and should be avoided by using roller-bearing supports and load noses, or some equivalent method.

Original languageEnglish (US)
Pages (from-to)185-188
Number of pages4
JournalJournal of Biomechanics
Volume30
Issue number2
DOIs
StatePublished - Feb 1997

Keywords

  • Finite element modeling
  • Flexural testing
  • Friction
  • Loading artifacts
  • Wear grooves

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

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