Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 528, Issue 10-11, Pages 3799-3808Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.01.081
Keywords
Polyurea; Shock-wave generation and propagation; Molecular-level calculations
Categories
Funding
- Office of Naval Research (ONR) through the Pennsylvania State University [4036-CU-ONR-1125]
- Army Research Office (ARO) [W911NF-09-1-0513]
- Army Research Laboratory (ARL) [W911NF-06-2-0042]
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A non-equilibrium molecular dynamics method is employed in order to study various phenomena accompanying the generation and propagation of shock waves in polyurea (a micro-phase segregated elastomer). Several recent studies reported in the literature suggested that polyurea has a relatively high potential for mitigation of the effects associated with blast and ballistic impact. This behavior of polyurea is believed to be closely related to its micro-phase segregated microstructure (consisting of the so-called hard domains and a soft matrix) and to different phenomena/processes (e.g. inelastic-deformation and energy-dissipation) taking place at, or in the vicinity of, the shock front. The findings obtained in the present analysis are used to help elucidate the molecular-level character of these phenomena/processes. In addition, the analysis yielded the shock Hugoniot (i.e. a set of axial stress vs. density/specific-volume vs. internal energy vs. particle velocity vs. temperature vs. shock speed) material states obtained in polyurea after the passage of a shock wave. The availability of a shock Hugoniot is critical for construction of a high deformation-rate, large-strain, high pressure material models which can be used within a continuum-level computational analysis to capture the response of a polyurea-based macroscopic structure (e.g. blast-protection helmet suspension pads) to blast/ballistic impact loading. (C) 2011 Elsevier B.V. All rights reserved.
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