Figure 4
From: An ultra-fast mechanically active cell culture substrate
Linear strain as a function of driving voltage (a) in compressive mode using the horizontal electrodes and (b) in tensile mode using the vertical electrodes. The strain along the x-axis ε x (red circles) and the y-axis ε y (blue diamonds) were measured by tracking the boundaries of the central gap identified with a hatched rectangle. Most of the deformation occurs along the x-axis due to the high membrane prestretch applied along the y-axis (see Fig. 3(a)). The local strain mapping for ε x was obtained using digital image correlation. In compressive mode, the device reaches −12% uniaxial strain with a (c) uniform strain field in the center of the membrane. In tensile mode, the device reaches 38% uniaxial strain and a (d) uniform strain field in the center of the membrane.
