Fig. 3
From: Bifurcation-based embodied logic and autonomous actuation
Finite element analysis to determine the phase boundary for anisotropic materials. a, b Energy and force, respectively, as a function of displacement, for a beam with θ = 45o and a w/L ratio varying from 0.07 to 0.12. The dashed box indicates bistable w/L values. c Energy barrier, Eout, necessary for a buckled beam to snap back to its undeformed configuration (the gray region indicates that the beam is monostable). d The phase boundaries as a function of anisotropy, where k1=0 indicates an isotropic material and increasing k1 indicates increasing anisotropy (i.e., larger stiffness ratio EL/ET); everything to the left of a particular line is bistable for that value of k1
