Glassmaker et al. 10.1073/pnas.0703762104. |
Fig. 7. Measured contact compliance (
) of the fibrillar samples normalized by that of a flat control at the same area [
], showing a significant increase with fibrillar spacing and possibly a weak dependence on fibril length.
Fig. 8. Peak pull-off load for the fibrillar samples, normalized by its value for a flat control, is significantly greater than unity. It appears to be nearly the same for the two larger spacings.
Movie 1. Evolution of contact area during indentation of a flat control with a glass sphere. The contact is circular, and there is little hysteresis.
Movie 2. Evolution of contact area during indentation of a fibrillar sample with a glass sphere. The contact periphery senses the fibrillar structure. It does not advance or recede smoothly, rather, it is pinned. This is the primary mode of energy dissipation.