Research Article

Free Vibration Analysis of Rotating Pretwisted Functionally Graded Sandwich Blades

Table 7

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

Mode102030405060708090100

1st4.45784.47434.47454.47594.49034.50644.50224.51154.51464.5213
2nd24.263625.416725.551825.669625.709025.733725.768625.802425.843325.8342
3rd28.246833.063338.194144.835751.528859.212767.364574.209977.618677.2360
4th43.932073.093775.903376.179276.498076.708376.761876.381482.748491.1187
5th76.639189.2792113.8445130.9914147.7835151.9612156.271159.8808159.7313159.6019
6th87.767799.5237126.202147.8068155.1631169.1361191.4968207.7979230.7914250.1723