MEDICAL DEVICES BASED ON BIOINSPIRED CERAMICS - Advanced Biomaterials: Fundamentals, Processing, and Applications - page 373

300

Beech (axial)
Poplar (axial)
Mahogany (axial)
Red oak (axial)

(a)

250

Sapele (axial)

200 MSA model

UDP

150

NUDP

100

50

0

40 45 50 55 60 65

Porosity (%)

120

(b)

Beech (radial)

Poplar (radial)
Poplar (tangential)
Mahogany (radial)
Mahogany (tangential)
Red oak (radial)
Red oak (tangential)

100

80

Sapele (radial)

Sapele (tangential)

60

MSA model

40

20

0

40 45 50 55 60 65

Porosity (%)

Figure 11.15. Elastic modulus as a function of porosity for: (a) axial; and (b) tangential and
radial orientations with UDP and NUDP bioSiC grouped in the axial plot (error bars equal one
standard deviation). Values predicted by the MSA model for both orientations are shown by
dashed lines.

materials is plotted as relative strength, σ c / σ ys (where σ c is the strength of the

porous solid and ys is the strength of the fully dense material), versus SiC volume

fraction. The strength data of the fully dense sintered SiC, measured under the
same experimental conditions, is taken from a previous work [Muñoz, 2002]. For
every material, the average of the relative strength was taken, and the scatter is
indicated with the error bars. The compressive strength of BioSiC was measured
in the axial and radial orientation. It was up to six times larger when the com-
pression was parallel to the axial direction, indicating the importance of the

σ