OPTIMIZATION OF CYLINDRICAL-SHELLS OF FIBER-REINFORCED COMPOSITE-MATERIALS

Problems of optimizing nonelastic circular shells are considered. The material of the shells is assumed to be a fiber-reinforced composite w ith fibers unidirectionally embedded in a relatively less stiff but du ctile metallic matrix so that the material has the yield surface sugge sted try Lance and Robinson. The shell is subjected to an impulsive lo ading of short-time periods generating initial kinetic energy. During plastic deformation of the shell the initial kinetic energy is transfo rmed into the plastic strain energy. The shell thickness is assumed to be piecewise constant. Various thicknesses and coordinates of the rin gs, where the thickness has jumps, are preliminarily unspecified. We l ook for a shell design for which the maximum residual deflection has a minimum value for the total weight given. The alternative problem of minimizing the shell weight for the maximum deflection given is also s tudied.