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Abstract: The elastic-plastic stability problems of cylindrical shell
under internal pressure and axial compression are studied on the basis
of the theory of nonlinear elastoplastic stability. The principle of
effects of different proportional load paths， initial imperfect and
plastic deformation on elastic-plastic sta bility is obtained. Results
show that critical wrinkling axial compression stresses will increase at
the beginning stage，but the stresses will reduce when the internal
pressure reachesa certain value. And the critical wrinkling axial
compression stresses will descend with the increment of imperfect
factors. The study shows the following as well，for the same imperfect
factor，the critical wrinkling axial compression stresses will increase
with the increment of the proportional load parameter D when D value
less than 1.0，but the values will fall down when D greater than 1.0. The
ideal load path is the proportional load parameter equal to 1.0. The
investigations enrich the theoretical background for internal high
pressure forming technology.
Key words: Cylindrical shell Elastoplastic stability Proportional
load Imperfect factor
CLC No: TG394
国家自然科学基金资助项目(59975021). Received 20010415, received in revised form
20011120
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