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IN THIS MANUSCRIPT, STIFFENED CARBON / EPOXY COMPOSITE CYLINDERS UNDER EXTERNAL HYDROSTATIC PRESSURE WILL BE EXAMINED TO MINIMIZE MASS AND MAXIMIZE BUCKLING PRESSURE. THE NEW APPROACH PROPOSED IN THIS PAPER IS SINGLE OBJECTIVE OPTIMIZATION OF STIFFENED COMPOSITE CYLINDRICAL SHELL UNDER EXTERNAL PRESSURE BY GENETIC ALGORITHM (GA) IN ORDER TO OBTAIN THE REDUCTION OF MASS AND COST, AND INCREASING THE BUCKLING PRESSURE. THE OBJECTIVE FUNCTION OF BUCKLING HAS BEEN USED BY PERFORMING THE ANALYTICAL ENERGY EQUATIONS AND TSAI-WU AND HASHIN FAILURE CRITERIA HAVE BEEN CONSIDERED. SINGLE OBJECTIVE OPTIMIZATION WAS PERFORMED BY IMPROVING THE EVOLUTIONARY GA. OPTIMIZATION HAVE BEEN DONE TO ACHIEVE THE MINIMUM WEIGHT WITH FAILURE AND BUCKLING CONSTRAINTS. FINALLY, OPTIMAL ANGLES PATTERN OF LAYERS AND FIBER ORIENTATIONS ARE PROVIDED FOR CYLINDER UNDER EXTERNAL HYDROSTATIC PRESSURE.
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