Figure 7: Mechanical tests on 3D printed samples mimicking the spike
cuticle. (A) Blunt penetration and (B) 3-point-bending load-displacement
curves of samples with and without the plywood connecting the monolithic
brittle layer to the parallel fiber anisotropic region. Snapshots of
sample deformation and failure behavior during mechanical testing are
given in (C) and (D). Scale bars: 1 cm. * denotes crack deflection.
Details of sample geometry, fiber architecture and testing configuration
are also shown (H= 4 cm, W= 3cm, L= 20cm, h=1.5 cm, s= 16 cm, d= 0.1 cm,
rotation angle between fiber beds γ is 18°). |