(Received 15 July 1991; accepted 18 February 1992)
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Methods of theoretical considerations and experiments on elastic and plastic strains in rotational internally pressurised shells with rigid bottoms are presented. The shells were treated as three-dimensional bodies, and the algorithms and programs for numerical analysis were worked out according to the finite-element method (FEM) and Prandtl-Reuss theory of plastic flow. The presented methods of experiments were used for measurements of elastic and plastic strains in thin-walled rotational shells. Loading in the shell was incrementally realized. With the applied methods of numerical calculations and experiments, it is possible to analyze the bulging process in the shell up to the loss of strain stability. Strain increments are not limited in any way. The paper shows the results obtained with the shell bulging. A good agreement between the results obtained with FEM and those from experiments can be observed. The presented analysis can be a basis for work on a method allowing the control of the wall thickness while forming tubular elements in industry.
Assistant professor, Technical University of Opole, Opole,
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