Molecular-level simulations of shock generation and propagation in polyurea

被引:79
作者
Grujicic, M. [1 ]
Pandurangan, B. [1 ]
Bell, W. C. [1 ]
Cheeseman, B. A. [2 ]
Yen, C. -F. [2 ]
Randow, C. L. [2 ]
机构
[1] Clemson Univ, Dept Mech Engn, Clemson, SC 29634 USA
[2] USA, Res Lab, Weap & Mat Res Directorate, Aberdeen Proving Ground, MD 21005 USA
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 10-11期
关键词
Polyurea; Shock-wave generation and propagation; Molecular-level calculations; MECHANICAL-PROPERTIES; FORCE-FIELD; CAPABILITY; COMPASS;
D O I
10.1016/j.msea.2011.01.081
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
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.
引用
收藏
页码:3799 / 3808
页数:10
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