The Effect of Internal Pressure on the Initial Buckling of Thin-walled Circular Cylinders under Torsion

摘要

A theoretical investigation into the effect of internal pressure on the initial buckling of thin-walled circular cylinders under torsion is described in this paper, and a comparison is made with previous American experimental and theoretical work. The need for the investigation arose in the design of an engine nacelle for a jet-propelled aircraft, when it was required to estimate the effect of aerodynamic suction on the stability of the nacelle skin under torsion.nThe effect of internal pressure on a circular cylinder under torsion is to increase the critical shear stress, to decrease the circumferential wavelength, and to increase the angle between the axis of the cylinder and the direction of the waves. Further, there is little difference in the values of these quantities for clamped and simply-supported edge conditions, and this difference decreases rapidly with the increase of internal pressure. The agreement between experimental and theoretical values of the critical shear stress is good.