On seismically induced vibrations of pressure vessels with cutouts and cracks

In this paper the dynamic response of finite circular cylindrical elastic shell represting a pressure vessel is investigated due to periodic and seismic vibration of the formnsub(z) = q(x,PHI) cos (ωt+PSI). where q(x,PHI) os the amplitude of a seismically induced load, ω is the forcing frequency and PSI is the phase constant. The dynamical form of more accurate Morley's equations are developed for a circular cylindrical shell. Then, these governing equations are utilized to investigate the elastic behavior of a circular cylindrical vessel with an elliptical cutout or an axial crack under the seismically induced load. The distribution of force and moment stress resultants and corresponding stress concentration factors and the stress intensity factors around the crack tip were examined. (orig.)