4 Experimental Nonlinear Dynamics of Laminated Quasi-Isotropic Thin Composite Plates 35 Fig. 4.4 Free vibration of the fully clamped (CCCC) quasi-isotropic plate ([0/45/90/135]s carbon fiber-epoxy, Plate 2): (a) response amplitude vs. time, (b) the FFT of (a) shows 327.148 Hz against the theoretical result 394.157 Hz Fig. 4.5 Free vibration of the cantilever (CFFF) quasi-isotropic plate ([0/45/90/135]s carbon fiber-epoxy, Plate 2): (a) 0ı response amplitude vs. time, (b) the FFT of (a) shows 39.368 Hz against the theoretical result 48.314 Hz, (c) 90ı response amplitude vs. time, (d) the FFT of (c) shows 23.651 Hz against the theoretical result 28.462 Hz
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