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  In situ micropillar compression reveals superior strength and ductility but an absence of damage in lamellar bone

Schwiedrzik, J. J., Raghavan, R., Bürki, A., Lenader, V., Wolfram, U., Michler, J. K., et al. (2014). In situ micropillar compression reveals superior strength and ductility but an absence of damage in lamellar bone. Nature Materials, 13(7), 740-747. doi:10.1038/nmat3959.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-D397-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-D399-4
Genre: Journal Article

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 Creators:
Schwiedrzik, Johann Jakob1, Author              
Raghavan, Rejin2, 3, Author              
Bürki, Alexander1, Author              
Lenader, Victor4, Author              
Wolfram, Uwe1, Author              
Michler, Johann K.3, Author              
Zysset, Philippe Kurt1, Author              
Affiliations:
1Institute for Surgical Technology and Biomechanics, University of Bern, Stauffacherstr. 78, CH-3014 Bern, Switzerland, persistent22              
2Synthesis of Nanostructured Materials, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863403              
3Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, Feuerwerkerstrasse 39, Thun, Switzerland, ou_persistent22              
4EMPA, Swiss Federal Laboratories for Material Science and Technology, Laboratory of Mechanics of Materials and Nanostructures, Feuerwerkerstr. 39, CH-3602 Thun, Switzerland, persistent22              

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Free keywords: Compression testing; Ductility; Scanning electron microscopy; Yield stress, Damage accumulation; Hierarchical organizations; Mechanical behaviour; Mechanical response; Micro-pillar compressions; Micromechanical property; Rheological modeling; Strength and ductilities, Bone, animal; article; biomechanics; bone; compressive strength; histology; mechanical stress; physiology; scanning electron microscopy; sheep; ultrastructure, Animals; Biomechanical Phenomena; Bone and Bones; Compressive Strength; Microscopy, Electron, Scanning; Sheep; Stress, Mechanical
 Abstract: Ageing societies suffer from an increasing incidence of bone fractures. Bone strength depends on the amount of mineral measured by clinical densitometry, but also on the micromechanical properties of the hierarchical organization of bone. Here, we investigate the mechanical response under monotonic and cyclic compression of both single osteonal lamellae and macroscopic samples containing numerous osteons. Micropillar compression tests in a scanning electron microscope, microindentation and macroscopic compression tests were performed on dry ovine bone to identify the elastic modulus, yield stress, plastic deformation, damage accumulation and failure mechanisms. We found that isolated lamellae exhibit a plastic behaviour, with higher yield stress and ductility but no damage. In agreement with a proposed rheological model, these experiments illustrate a transition from a ductile mechanical behaviour of bone at the microscale to a quasi-brittle response driven by the growth of cracks along interfaces or in the vicinity of pores at the macroscale. © 2014 Macmillan Publishers Limited. All rights reserved.

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Language(s): eng - English
 Dates: 2014-07
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1038/nmat3959
BibTex Citekey: Schwiedrzik2014740
 Degree: -

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Title: Nature Materials
  Abbreviation : Nat. Mater.
Source Genre: Journal
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Publ. Info: London, UK : Nature Pub. Group
Pages: - Volume / Issue: 13 (7) Sequence Number: - Start / End Page: 740 - 747 Identifier: ISSN: 1476-1122
CoNE: /journals/resource/111054835734000