On the modeling of a visco-hyperelastic polymer gel under blunt ballistic impacts
Affiliation auteurs | !!!! Error affiliation !!!! |
Titre | On the modeling of a visco-hyperelastic polymer gel under blunt ballistic impacts |
Type de publication | Journal Article |
Year of Publication | 2018 |
Auteurs | Bracq A., Haugou G., Bourel B., Marechal C., Lauro F., Roth S., Mauzac O. |
Journal | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING |
Volume | 118 |
Pagination | 78-90 |
Date Published | AUG |
Type of Article | Article |
ISSN | 0734-743X |
Mots-clés | Blunt ballistic impact, constitutive modeling, Impact modeling, Mechanical characterization, soft material |
Résumé | 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(-1)). Indeed, these experiments highlight a significant strain rate sensitivity but also a nonhomogeneous 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. |
DOI | 10.1016/j.ijimpeng.2018.04.001 |