Characterization of the mechanical response of elastomers using complex experiments: Simple ways to describe multiaxiality
Résumé
Characterization of material response remains a challenging task. From the simultaneous use of simple experiments to multiaxial characterization with Finite Element Method Updating (FEMU) or Virtual Fields Method (VFM), several methods have been explored through the years. Thus, the possibility to characterize a material using only one "rich" experiment has made its path. As an example, the use of a multi-actuators machine, such as an Hexapod platform capable of 6-degrees freedom motions, can be considered as it allows a wide range of complex loading conditions. The present paper aims to discuss the development of a rich mechanical experiment that guarantees a robust mechanical characterization by material parameters fitting or Data-Driven methods. A first approach consists in exhibiting the diversity of strain mulitaxiality and intensity thanks to Hencky's tensor invariants K 2 and K 3 introduced by Criscione, Humphrey, Douglas, & Hunter (2000). A second one is based on the strain energy density, in the hyperelastic framework. Here, complex tests are conducted on hyperelastic membranes. Strain maps of both multiaxiality and intensity are computed along the loading path. Comparison with the classical experimental data of Treloar (1944) is proposed.
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