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. Author manuscript; available in PMC: 2014 Aug 1.
Published in final edited form as: J Micromech Microeng. 2013 Jun 21;23(8):10.1088/0960-1317/23/8/085001. doi: 10.1088/0960-1317/23/8/085001

Figure 6.

Figure 6

(a) Computational modeling of the silicone (Stockwell Elastomerics) under shear loading exerted by the feet of the ASC. While no shear loads are applied to the stationary foot, 45 μN of shear force applied to the moveable actuator foot results in a displacement of 1.73 ± 0.1 μm. The top image is a top down view of the displacement, while the bottom image is an isometric view, and contains the color-coded displacement scale bar. To enhance visualization, the deflection was scaled up by 2.5x. (b) The ASC utilizes fiducial marker tracking to correlate effective shear stiffnes to a shear modulus, G. The moveable ASC foot (grey box, right) displaces laterally under applied voltage, applying a known force to the gel surface. Gel deformation is characterized by optically tracking embedded beads. The location of beads, xi, and projection of displacement, ui, in the direction of force, Fmechanical, are used with Equation 7 to derive shear modulus from ASC experiments. Beads directly behind the foot, e.g. bead 2, were used preferentially in calculating G to satisfy point force assumptions.