Plastic behaviour of microstructural constituents of cortical bone tissue: a nanoindentation study. (1st January 2013)

• Record Type: Journal Article
• Authors: Abdel-Wahab, Adel A.; Silberschmidt, Vadim V.
• Is Part Of: International journal of experimental and computational biomechanics. Volume 2:Number 2(2013)
• Page Start: 136
• Page End: 157
• Publication Date: 2013-01-01
• Subjects: cortical bone -- nanoindentation -- flow stress -- flow strain -- osteons -- interstitial matrix -- post-yield -- plastic behaviour -- microstructural constituents -- mechanical behaviour; Human mechanics -- Periodicals; Biomechanics -- Computer simulation -- Periodicals; Biomechanics -- Methodology -- Periodicals; 612.76
• Languages: English
• ISSNs: 1755-8735

Abstract

A mechanical behaviour of bone tissues is defined by mechanical properties of its microstructural constituents. Also, those properties are important as an input for finite-element models of cortical bone to simulate its deformation and fracture behaviours at the microstructural level. The aim of this study was to investigate a post-yield behaviour of osteonal cortical bone's microstructural constituents at different loading rates, maximum load levels and dwell times; nanoindentation with a spherical-diamond-tip indenter was employed to determine it. The nanoindentation results revealed significant difference in stiffness values of cortical bone's microstructural features –interstitial matrix and osteons. Similarly, interstitial matrix exhibited a stiffer post-yield behaviour compared to that of osteons that reflects the relationship between the post-yield behaviour and collagen maturity. In addition, both osteons and interstitial matrix demonstrated a time-dependent behaviour. However, in order to assess elastic-plastic behaviour accurately, an effect of viscosity on nanoindentation results was reduced by using a time-delay method.