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On the modeling of a visco-hyperelastic polymer gel under blunt ballistic impacts

Abstract : In this paper, the modeling of a polymer gel used as target medium in blunt ballistic experiments is presented. A new visco-hyperelastic law based on the Mooney–Rivlin model is proposed and implemented in a numerical simulation software. The material model identification relies on mechanical characterization experiments performed at room temperature through tensile and compressive tests over a wide range of strain rates (0.002–1500 s). Indeed, these experiments highlight a significant strain rate sensitivity but also a non-homogeneous strain and a barreling effect during compressive experiments. Hence, constitutive modeling of the material behavior cannot be directly determined. Tensile and compressive data are exploited with a direct and indirect identification process. An optimization by inverse technique, using finite element modeling of static and dynamic compressive tests and a global response surface method, is employed to accurately reproduce loading conditions and identify the model parameters. Finally, the proposed visco-hyperelastic law is validated through comparison with experimental data from blunt ballistic impacts over various projectile velocities.
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Anthony Bracq, Grégory Haugou, Benjamin Bourel, Christophe Maréchal, Franck Lauro, et al.. On the modeling of a visco-hyperelastic polymer gel under blunt ballistic impacts. International Journal of Impact Engineering, Elsevier, 2018, 118, pp.78-90. ⟨10.1016/j.ijimpeng.2018.04.001⟩. ⟨hal-03451027⟩



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