Nonlinear Vibrations of 3D Laminated Composite Beams

Table 4

Natural frequencies (rad/s) of clamped-clamped laminated composite beam with symmetric cross ply [0°/90°/90°/0°], validation with Elmer.

Mode	Case  2 [0°/90°/90°/0°]
	Beam; 60 DOF	Elmer; 1 million DOF	Mode shape	Difference %
1	1188.70	1184.76	𝑣0	0.333
2	1496.90	1496.34	𝑤0	0.037
3	3196.79	3146.51	𝑣0	1.598
4	3958.58	3900.35	𝑤0	1.493
5	4876.05	4821.07	𝜃𝑥	1.141
6	5979.48	5898.63	𝑣0	1.371
7	7198.00	7169.94	𝑤0	0.391
8	9498.68	9269.03	𝑣0	2.478
9	9740.08	9644.57	𝜃𝑥	0.990
10	11197.12	11053.57	𝑤0	1.299