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.
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The authors would like to thank M. Mirzaali for help with the specimen preparation, I. Utke for the discussions about ion–matter interactions and SRIM, C. Schwiedrzik for valuable comments on the manuscript, and D. Frey and G. Buerki for technical assistance with the in situ indenter and FIB milling.
The authors declare no competing financial interests.
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Schwiedrzik, J., Raghavan, R., Bürki, A. et al. In situ micropillar compression reveals superior strength and ductility but an absence of damage in lamellar bone. Nature Mater 13, 740–747 (2014). https://doi.org/10.1038/nmat3959
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