Research Article

Free Vibration Analysis of Rotating Pretwisted Functionally Graded Sandwich Blades

Table 9

Nondimensional frequency parameters for the first six modes of the FG sandwich blade with varying layer thickness ratios (, , , and ).

Mode1/41/31/21/12/13/14/1

1st4.20214.30684.47434.75744.97645.08545.1378
2nd23.628024.353625.416727.088928.377128.942929.2352
3rd30.457631.318033.063335.067736.735637.671938.4396
4th68.069870.161973.093778.135081.725283.566984.7660
5th83.145185.658489.279295.5154100.6206103.1477104.3400
6th92.449895.198499.5237106.5238111.4889114.2924116.4530