Table 5 Thickness differences of shell layers.

From: Vibration frequency analysis of three-layered cylinder shaped shell with effect of FGM central layer thickness

Thickness arrangements

Internal Layer

Central Layer

External Layer

Case-I

q 1

q 1

q 1

Case-II

q 2

q 3

q 2

Case-III

q 4

q 5

q 4

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