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Influence and evolution mechanism of different sharpness contact forms to mechanical property of cortical bone by nanoindentation

Authors :
Xingdong Sun
Yue Guo
Lijia Li
Zeyang Liu
Di Wu
Dong Shi
Hongwei Zhao
Shizhong Zhang
Source :
AIP Advances, Vol 8, Iss 3, Pp 035313-035313-11 (2018)
Publication Year :
2018
Publisher :
AIP Publishing LLC, 2018.

Abstract

Based on different damage forms of various contact forms to bone, the mechanical response and mechanism were investigated by nanoindentation under different sharpness contact forms. For the purpose of simulating the different sharpness contact forms, two kinds of indenters were used in experiments and finite elements simulations. Through nanoindentation experiments, it was concluded that the residual depth of sharp indenter was bigger than that of blunt indenter with small penetration depth. However, the contrary law was obtained with bigger penetration depth. There was a turning point of transition from blunt tendency to sharp tendency. By calculation, it was concluded that the sharper the indenter was, the bigger the proportion of plastic energy in total energy was. Basically, results of finite elements simulation could correspond with the experimental conclusions. By the observation of FE-SEM, the surface of cortical bone compressed was more seriously directly below the blunt indenter than the lateral face. For the berkovich indenter, the surface of indentation compressed was less directly below the indenter, but seriously on three lateral faces. This research may provide some new references to the studies of bone fracture mechanism in different load patterns in the initial press-in stage and offer new explanation for bone trauma diagnosis in clinical treatment and criminal investigation.

Subjects

Subjects :
Physics
QC1-999

Details

Language :
English
ISSN :
21583226
Volume :
8
Issue :
3
Database :
Directory of Open Access Journals
Journal :
AIP Advances
Publication Type :
Academic Journal
Accession number :
edsdoj.0bfa8736c17141f4a8739873d804071c
Document Type :
article
Full Text :
https://doi.org/10.1063/1.5021540