Bone toughening through stress-induced non-collagenous protein denaturation

Original Paper
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Abstract

Bone toughness emerges from the interaction of several multiscale toughening mechanisms. Recently, the formation of nanoscale dilatational bands and hence the accumulation of submicron diffuse damage were suggested as an important energy dissipation processes in bone. However, a detailed mechanistic understanding of the effect of this submicron toughening mechanism across multiple scales is lacking. Here, we propose a new three-dimensional ultrastructure volume element model showing the formation of nanoscale dilatational bands based on stress-induced non-collagenous protein denaturation and quantify the total energy released through this mechanism in the vicinity of a propagating crack. Under tensile deformation, large hydrostatic stress develops at the nanoscale as a result of local confinement. This tensile hydrostatic stress supports the denaturation of non-collagenous proteins at organic–inorganic interfaces, which leads to energy dissipation. Our model provides new fundamental understanding of the mechanism of dilatational bands formation and its contribution to bone toughness.

Keywords

Bone Mineralized collagen fibril Finite element modeling Non-collagenous proteins Fracture toughness 

Notes

Acknowledgements

This study was financially supported by the US National Science Foundation (NSF) through Grant CMMI 1363526 and the National Institute of Health (NIH) through Grant AR49635.

Compliance with ethical standard

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

10237_2018_1016_MOESM1_ESM.docx (360 kb)
Supplementary material 1 (docx 360 KB)

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© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Mechanical, Aerospace and Nuclear EngineeringRensselaer Polytechnic InstituteTroyUSA
  2. 2.Center for Biotechnology and Interdisciplinary StudiesRensselaer Polytechnic InstituteTroyUSA
  3. 3.Department of Biomedical EngineeringRensselaer Polytechnic InstituteTroyUSA

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