Analytical Expressions for Frequency and Buckling of Large Amplitude Vibration of Multilayered Composite Beams

Table 3

Comparison of the frequency ratio of the LCB with simple end conditions for different amplitude ratio (𝜂=34.6410).

𝑊max	Cross-ply [0/90/90/0]		Angle-ply [45/−45/−45/45]		General lay-up [30/50/50/30]
	Ref. [7]	Present	Ref. [7]	Present	Ref. [7]	Present
5	1.0253	1.0308	1.0386	1.0397	1.0358	1.0422
1	1.0975	1.1181	1.1466	1.1491	1.1365	1.1451
2	1.3475	1.3543	1.5021	1.5536	1.4711	1.5471
3	1.6822	1.7030	1.9541	1.9949	1.9004	2.0032
4	2.1054	2.2064	2.4484	2.4807	2.3723	2.4020