“…In order to overcome the challenges in the analytical investigations, researchers have been employing various numerical techniques such as continuum power series method [24,25], the effective stiffness method [26,27], the mixture theory [28][29][30], the plane wave expansion method [31], the finite difference method [32], the variational method [33,34], and the finite element (FE) method [35][36][37][38][39]. In particular, the FE method offers a remarkable framework to efficiently investigate the effect of material and geometric nonlinearity on phononic dispersion relations [38,[40][41][42][43], which can be hardly done using other numerical techniques.…”