Investigation of physically nonlinear behaviour of polystyrene packages and their elements

K. Ragulskis, E. Kibirkštis, A. Dabkevičius, V. Bivainis, V. Miliūnas, L. Ragulskis


The model for the analysis of compression of a polystyrene package is based on the analysis of an axi-symmetric physically nonlinear elastic structure. Nonlinear elasticity is taken into account using the hyperbolic model and it is considered as an approximation to the plastic be-haviour which can be analyzed by the theory of deforma-tional plasticity valid for monotonic loading.
The model for the analysis of bending of a strip of polystyrene is presented. The beam model by taking cubic nonlinearity of Duffing type into account is used. It is shown that the bending behaviour is substantially influ-enced by the physical nonlinearity.
Experimental investigations using a specially de-veloped setup have been performed for a number of types of polystyrene packages. The main graphical relationships and results of the experimental investigations are pre-sented. It is determined that the results of experimental investigations in the initial stage of deformations corre-spond with the numerical ones. The obtained results of investigations are used in the process of design of the ele-ments of packages.

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Print ISSN: 1392-1207
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