The forces produced by all the asymmetric textures are much
larger than the experimental limit. There is also a monotonic trend
where decreasing the value of the angle β leads to an increase in
forces produced, being maximum for β¼5.3°, the smallest angle
tested. It is also seen that when the velocity of the top plate
changes directions, the sign of the forces produced by the asymmetric
textures changes sign. This direction dependence suggests
that cavitation effects are not the cause of normal force. Rather, the
directional sign change suggests viscous effects produce the normal
forces. For the asymmetric textures with β¼9.4° and 5.3°, the
forces produced in bi-directional sliding are symmetric with
respect to FN¼0, while for the textures with β¼21.7° and 14°, the
forces are not symmetric about FN¼0 (sign change, but magnitudes
are not the same for opposite direction of motion). This may
be due to the secondary slope from the maximum depth of the
texture back up to the non-textured region seen with β¼21.7° and
14° which is not as pronounced with β¼9.4° and 5.3° (see Fig. 4
depth profiles).
The forces produced by all the asymmetric textures are muchlarger than the experimental limit. There is also a monotonic trendwhere decreasing the value of the angle β leads to an increase inforces produced, being maximum for β¼5.3°, the smallest angletested. It is also seen that when the velocity of the top platechanges directions, the sign of the forces produced by the asymmetrictextures changes sign. This direction dependence suggeststhat cavitation effects are not the cause of normal force. Rather, thedirectional sign change suggests viscous effects produce the normalforces. For the asymmetric textures with β¼9.4° and 5.3°, theforces produced in bi-directional sliding are symmetric withrespect to FN¼0, while for the textures with β¼21.7° and 14°, theforces are not symmetric about FN¼0 (sign change, but magnitudesare not the same for opposite direction of motion). This maybe due to the secondary slope from the maximum depth of thetexture back up to the non-textured region seen with β¼21.7° and14° which is not as pronounced with β¼9.4° and 5.3° (see Fig. 4depth profiles).
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