Department of Solid Mechanic;
Faculty of Mechanical Engineering;
University of Kashan;
Kashan 87317-51167;
Iran;
Duy Tan University;
Institute of Research&Development;
3 Quang Trung;
Danang;
Vietnam;
FG-CNTRC cylindrical pressure vessel; first-ordershear deformation theory; free vibration; Pasternak’s foundation; rule of mixture;