Dynamic torsional buckling of cylindrical shells

In this paper the local buckling of cylindrical shell under torsion is discussed. The Hamiltonian system approach is employed to analyze the propagation of shear wave. In this system, critical torsional loads and buckling modes are reduced to a problem of eigenvalues and eigensolutions of increasing orders. Buckling modes are divided into two types, the local torsional buckling modes and the helical buckling modes. For short-time shear wave propagation, local torsional buckling occurs easily. On the contrary, the helical buckling modes appear when the wave propagates for a longer time and these modes correspond to the first-order eigensolution.