College of Mechanical and Electrical Engineering Harbin Engineering University;
Harbin;
150001;
China;
College of Aerospace and Civil Engineering Harbin Engineering University;
Harbin;
150001;
China;
Pakhtunkhwa Energy Development Organization(PEDO);
Khyber Pakhtunkhwa;
Pakistan;
Composite egg-shaped pressure hull; Design optimization; Buoyancy factor; Material failure; Buckling instability;