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Material-Model-Based Determination of the Shock-Hugoniot Relations in Nanosegregated Polyurea

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Abstract

Previous experimental investigations reported in the open literature have indicated that applying polyurea external coatings and/or internal linings can substantially improve ballistic penetration resistance and blast survivability of buildings, vehicles, and laboratory/field test-plates, as well as the blast-mitigation capacity of combat helmets. The protective role of polyurea coatings/linings has been linked to polyurea microstructure, which consists of discrete hard-domains distributed randomly within a compliant/soft matrix. When this protective role is investigated computationally, the availability of reliable, high-fidelity constitutive models for polyurea is vitally important. In the present work, a comprehensive overview and a critical assessment of a polyurea material constitutive model, recently proposed by Shim and Mohr (Int J Plast 27:868-886, 2011), are carried out. The review revealed that this model can accurately account for the experimentally measured uniaxial-stress versus strain data obtained under monotonic and multistep compressive loading/unloading conditions, as well as under stress relaxation conditions. On the other hand, by combining analytical and finite-element procedures with the material model in order to define the basic shock-Hugoniot relations for this material, it was found that the computed shock-Hugoniot relations differ significantly from their experimental counterparts. Potential reasons for the disagreement between the computed and experimental shock-Hugoniot relations are identified.

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Acknowledgments

The material presented in this paper is based on work supported by the Office of Naval Research (ONR) research contract entitled “Elastomeric Polymer-By-Design to Protect the Warfighter Against Traumatic Brain Injury by Diverting the Blast Induced Shock Waves from the Head,” Contract Number 4036-CU-ONR-1125 as funded through the Pennsylvania State University. The authors are indebted to Dr. Roshdy Barsoum of ONR for continuing support and interest in the present work.

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  1. Department of Mechanical Engineering, Clemson University, 241 Engineering Innovation Building, Clemson, SC, 29634-0921, USA

    Mica Grujicic, J. S. Snipes, R. Galgalikar & S. Ramaswami

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  1. Mica Grujicic
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Grujicic, M., Snipes, J.S., Galgalikar, R. et al. Material-Model-Based Determination of the Shock-Hugoniot Relations in Nanosegregated Polyurea. J. of Materi Eng and Perform 23, 357–371 (2014). https://doi.org/10.1007/s11665-013-0769-7

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