Abstract
Polymer materials are gaining more and more importance in engineering applications. A new methodology of analysis is required in order to assess the capability of such material in withstanding complex loads. Therefore, the behavior of these materials currently arouses a great research interest. The use of PVC plastic pipes in pressure vessels and pipelines has increased rapidly in the last decade. In order to determine the plastic behavior of PVC, an experimental method is presented. Through the results obtained from experimental tests, in the first part of this paper, we investigate the use of a phenomenological model proposed by G’Sell and Jonas. The true stress-strain response under large plastic deformation was investigated in different stress triaxiality frameworks. Particular attention was given to volumetric strain evolution, separation resulting from elastic volumetric strain, plastic volumetric strain and pure shear. The effect of stress triaxiality on plastic instability and fracture strain was also examined. The deformation process should be considered as explained, and the anisotropic plastic response induced by the deformation could be introduced in constitutive equations of G’Sell.
Highlights
In the plastics industry, technical polymers are widely used in engineering components which may experience complex mechanical loadings
The aim of this paper is to investigate the plastic behavior of Polyvinyl-Chloride (PVC) in different triaxiality frameworks, under large deformation and in plane stress condition
The plastic damage of this material was analyzed in different triaxiality frameworks
Summary
Technical polymers are widely used in engineering components which may experience complex mechanical loadings. The understanding of their intrinsic mechanical behavior is of prime importance in the design of components made of such. Considerable attention has been focused on the analysis of large plastic deformation of ductile materials and solid polymers. The response of solid polymers is known to be sensitive to factors such as: temperature, strain rate, strain, plastic instability during the necking stage and the hardening, and the type of loading conditions, i.e. the stress triaxiality effect [21, 37,38]. Some experimental devices have been developed and proposed [25, 39,40]
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