Fig. 3: Switching of mechanical properties.
From: 4D printing of reconfigurable metamaterials and devices
a Shape-shifting structures that switch their mechanical behavior from highly compliant to semi-rigid upon activation. The error bars represent the standard deviation (n = 3 per group). b The switching of the Poisson’s ratio of a 4D printed specimen made using re-entrant unit cells. Upon activation, the specimen switches its mechanical behavior from conventional (i.e., a positive value of the Poisson’s ratio) to auxetic (i.e., a negative value of the Poisson’s ratio). In all cases, experimental and computational results are presented side by side. See Supplementary Video 5.
