Abstract
The biaxial properties of materials such as rubbers or polymers, used in mechanical or thermoplastic applications, are often difficult to identify. However, biaxial properties are useful for the simulation of plastic-processing operations such as blow molding, stretch blow molding or thermoforming. The global approach is to identify the hyperelastic behavior of this type of materials from contour measurements and full field measurements by inverse analysis using numerical simulations such as Finite Element Method. The rheological behavior and the mechanical properties of rubbers and polymers can be obtained by using a bubble inflation rheometer. In this paper, experimental results obtained using elongational rheometer developed in the laboratory are presented. A detailed description of the experimental part is made. Two optical measurement methods are used: (i) measure with only one CCD camera; (ii) the full field technique of images stereocorrelation (2 CCD cameras). Numerical modeling are realized by using Finite Element software ABAQUS (R). Preliminary results of the identification (taken into account of the boundary conditions, function cost, parameters of the model of behavior) and validation of these results by carrying out tensile tests are presented.