A Nonlinear Mechanics Model of Zigzag Cellular Substrates for Stretchable Electronics

The use of cellular elastomer substrates not only reduces its restriction on natural diffusion or convection of biofluids in the realm of stretchable electronics but also enhances the stretchability of the electronic systems. An analytical model of zigzag cellular substrates under finite deformation is established and validated in this paper. The deformed shape, nonlinear stress-strain curve, and Poisson's ratio-strain curve of the cellular elastomer substrate calculated using the reported analytical model agree well with those from finite element analysis (FEA). Results show that lower restriction on the natural motion of human skin could be achieved by the proposed zigzag cellular substrates compared with the previously reported hexagonal cellular substrates, manifesting another leap toward mechanically invisible wearable, stretchable electronic systems.