This work deals with solving of problems for deformation processes in thermoforming for production of axesymmetric thin walled structural plastics.We suggested a non-linear viscoelastic rheological model with a corrected strain energy function for improvement of physical properties of final part.Revealed differential equations are used for description of kinetics of viscoelastic and elastic deformation in every point of stretching polymer.Analysis of these equations shows,that mechanical pre-stretching with plug causes a non-homogeneity deformation effect on polymer.We determined a quantitative relation between stress and technical parameters of mechanical pre-stretching thermoforming and comparison of theoretical and experimental results.These results let us predict stable sizes of final structural plastics for usage of them in high temperature conditions.We realized that deformation process in stage of pre-stretching has a direct influence on final property of thin walled plastics produced by thermoforming.This process with suggested rheological model in this paper not only solves some kinds of technical defects in thermoforming(such as wall thickness variations,physical instability during inflation-shrinkage and warpage exhibited in the final part),but also creates conditions for production of plastics with high performance.
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