A method is presented for solving the three-dimensional axisymmet- ric field equations for a perfectly plastic material which obeys the von-Mises yield criterion and the Levy-Mises flow law. The method is used for the...A method is presented for solving the three-dimensional axisymmet- ric field equations for a perfectly plastic material which obeys the von-Mises yield criterion and the Levy-Mises flow law. The method is used for the particular case in which a small axisymmetric perturbed flow is superposed on a uniform flow without flow reversal taking place. The method then leads to solving a fourth order differen- tial equation for the velocity potential. The special case of a thick cylindrical shell under compressive flow is examined. The solution so obtained, being derived from the three dimensional theory, includes a correct treatment of transverse shear distor- tion. A preferred mode of instability is identified having a wave-length in reasonable agreement with that obtained experimentally by other workers.展开更多
A preferred growing perturbation concept has been introduced into the dynamical study on the generation ofatmospheric teleconnection patterns.It is shown that all the important teleconnection patterns observed in the ...A preferred growing perturbation concept has been introduced into the dynamical study on the generation ofatmospheric teleconnection patterns.It is shown that all the important teleconnection patterns observed in the realatmosphere may be established through internal barotropic dynamical processes.展开更多
文摘A method is presented for solving the three-dimensional axisymmet- ric field equations for a perfectly plastic material which obeys the von-Mises yield criterion and the Levy-Mises flow law. The method is used for the particular case in which a small axisymmetric perturbed flow is superposed on a uniform flow without flow reversal taking place. The method then leads to solving a fourth order differen- tial equation for the velocity potential. The special case of a thick cylindrical shell under compressive flow is examined. The solution so obtained, being derived from the three dimensional theory, includes a correct treatment of transverse shear distor- tion. A preferred mode of instability is identified having a wave-length in reasonable agreement with that obtained experimentally by other workers.
文摘A preferred growing perturbation concept has been introduced into the dynamical study on the generation ofatmospheric teleconnection patterns.It is shown that all the important teleconnection patterns observed in the realatmosphere may be established through internal barotropic dynamical processes.
