Free Vibration Analysis of the Unified Functionally Graded Shallow Shell with General Boundary Conditions

Figure 3

Variations of the first frequency parameters of the Al/Al₂O₃ shallow shells with different boundary constraints: BD1: CE²CE²; BD2: SCSC; BD3: E¹E¹E¹E¹; BD4: E²E²E²E²; BD5: E³E³E³E³; BD6: SE³SE³.

(a) Plate

(b) Cylindrical shell

(c) Spherical shell

(d) Hyperbolic paraboloidal shell