Annulus fibrosus microstructure: an explanation to local heterogeneities
Résumé
Annulus fibrosus (AF) is the outer tissue of
intervertebral discs (IVD). Its peculiar
microstructure and biphasic composition define by
an oriented fibre network embedded in a highly
hydrated matrix (60−70%) is usually assimilated to
porous composite material. It confers to AF a nonlinear,
viscous and anisotropic behaviour.
Many experimental and numerical studies
underlined the anisotropic and non-linear
mechanical behaviours on averaged values
[Ambard and Cherblanc, 2009; Malandrino et al,
2011] but fail to represent the experimental strain
heterogeneities [Baldit et al, 2013a; Michalek et al,
2010], that would be related to the microstructure
and the biphasic constitution. On the other hand,
characterization rarely relies on volumic behavior
but it’s relevant when models deal with soft porous
media [Baldit et al, 2013b].
This work aims to couple a poro-hyper-elastic
model identification with homogenized and
discretized geometries highlighting model
sensitivity and limits regarding experimental
transverse strains measurements.
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