
304 Biomaterials for Bone Regeneration
successive loading, the stress in the poroelastic medium will be given by
Equation [9.32], here more conveniently rearranged by separating the devi-
atoric strain from the volumic strain:
pI [9.79]
where
+
[9.80]
is the isotropic stress component in the poroelastic material after load-
ing. The macromechanical moduli μ
*
, B
*
and the Poisson ratio ν must be
regarded as independent parameters as seen with Ashby’s models. The vol-
ume stretch J = J
L
J
o
includes the effect ...