Nonlinear Vibrations of 3D Laminated Composite Beams

Table 3

Natural frequencies (rad/s) of clamped-clamped laminated composite beam with symmetric cross ply [0°/0°/0°/0°], validation with Elmer.

Mode	Case  1 [0°/0°/0°/0°]
	Beam 60 DOF	Elmer; 1 million DOF	Mode shape	Difference %
1	1589.83	1589.05	𝑤0	0.049
2	1589.83	1589.06	𝑣0	0.049
3	4198.73	4136.98	𝑤0	1.493
4	4198.73	4137.00	𝑣0	1.492
5	5057.49	4999.45	𝜃𝑥	1.161
6	7618.51	7596.04	𝑤0	0.296
7	7618.51	7596.11	𝑣0	0.295
8	10102.52	10001.40	𝜃𝑥	1.011
9	11833.45	11698.23	𝑤0	1.156
10	11833.45	11698.39	𝑣0	1.155