Comportement mécanique de l'os spongieux à différentes vitesses de déformation. : relations entre architecture et réponse mécanique.

Abstract : In order to develop means of protection and prevention for people and their activities, this thesis manuscript contributes towards understanding failure mechanisms under different loading rates. The behavior of cancellous bovine bone, unconfined, with marrow, has been studied over a range of 8 strain rates, from quasi-static (10-3/s) to dynamic (600/s) regimes. For the latter, specific interrupted compression experimental techniques were developed. The pre-compression micro CT architectural characterization highlighted relevant architectural parameters and the role this organization may have in the behavior of cancellous bone under different regimes. The fracture surfaces of the specimen were observed by post compression micro CT imaging. Despite the large experimental data base (127 samples), all architectural configurations present in individuals could not be tested. A first architectural generator was then developed to digitally create bone structures. Whilst avoiding the destructive nature of the test and the dependence of the samples, this tool contributes to the understanding of the fracture mechanisms of cancellous bone over a large range of strain rates. Finally, the immediate prospects for this work include the validation of the architectural generator using the discrete element method.
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Marianne Prot. Comportement mécanique de l'os spongieux à différentes vitesses de déformation. : relations entre architecture et réponse mécanique.. Biomécanique [physics.med-ph]. Ecole nationale supérieure d'arts et métiers - ENSAM, 2015. Français. ⟨NNT : 2015ENAM0030⟩. ⟨tel-01314439⟩

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