Journal
JOURNAL OF BIOMECHANICS
Volume 40, Issue 14, Pages 3285-3288Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jbiomech.2007.04.020
Keywords
bone mechanics; fracture toughness; bone microstructure; indentation fracture; bone quality
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The purpose of this work is to investigate the use of indentation fracture as a method of measuring toughness at the microscale in cortical bone. Indentation fracture employs sharp indenters to initiate cracks, whose length can be used to calculate the toughness of the material. Only a cube corner indenter tip is found to initiate cracks at a suitable size scale for microstructural measurement. Cracks from 7 to 56 mu m in length are produced using loads from 0.05 to 3 N. Preliminary data predicts rising toughness with increasing crack length (rising R-curve behaviour) at the microscale. This technique provides a new insight into fracture in cortical bone since it allows the investigator to observe mechanisms and measure toughness at a size scale at which in vivo damage is known to exist. (C) 2007 Elsevier Ltd. All rights reserved.
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