DYNAMIC BUCKLING OF IMPERFECT CYLINDRICAL-SHELLS UNDER AXIAL-COMPRESSION AND BENDING MOMENT

The dynamic stability of circular metallic and laminated cylindrical s hells is investigated. The cylinders are geometrically imperfect and s ubjected to axial compression or pure bending moment, These loads are suddenly applied with constant magnitude and finite or infinite durati on, The finite element method is employed to generate dynamic response s and the equations of motion approach to determine dynamic critical l oads. The effects of load duration and imperfection amplitude on criti cal loads are discussed, It is found that the dynamic critical loads d ecrease with increasing load duration and converge to those for the lo ad case of infinite duration. The convergence rate is related to the f undamental frequency of the cylinder. In addition, both the static and dynamic critical loads decrease with increasing imperfection amplitud e.