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

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TitreOn the modeling of a visco-hyperelastic polymer gel under blunt ballistic impacts
Type de publicationJournal Article
Year of Publication2018
AuteursBracq A., Haugou G., Bourel B., Marechal C., Lauro F., Roth S., Mauzac O.
JournalINTERNATIONAL JOURNAL OF IMPACT ENGINEERING
Volume118
Pagination78-90
Date PublishedAUG
Type of ArticleArticle
ISSN0734-743X
Mots-clésBlunt 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.

DOI10.1016/j.ijimpeng.2018.04.001