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Title: HIGH STRAIN-RATE AND SHOCK LOADING OF POLYETHYLENE

Authors:
 [1];  [1];  [1];  [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1321690
Report Number(s):
LA-UR-07-2335
DOE Contract Number:
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: SOCIETY FOR EXPERIMENTAL MECHANICS (SEM) ANNUAL CONFERENCE ; 200706 ; SPRINGFIELD
Country of Publication:
United States
Language:
English

Citation Formats

BROWN, ERIC N., GRAY, GEORGE T., MILLETT, JEREMY C., and BOURNE, NEIL K. HIGH STRAIN-RATE AND SHOCK LOADING OF POLYETHYLENE. United States: N. p., 2007. Web.
BROWN, ERIC N., GRAY, GEORGE T., MILLETT, JEREMY C., & BOURNE, NEIL K. HIGH STRAIN-RATE AND SHOCK LOADING OF POLYETHYLENE. United States.
BROWN, ERIC N., GRAY, GEORGE T., MILLETT, JEREMY C., and BOURNE, NEIL K. Mon . "HIGH STRAIN-RATE AND SHOCK LOADING OF POLYETHYLENE". United States. doi:. https://www.osti.gov/servlets/purl/1321690.
@article{osti_1321690,
title = {HIGH STRAIN-RATE AND SHOCK LOADING OF POLYETHYLENE},
author = {BROWN, ERIC N. and GRAY, GEORGE T. and MILLETT, JEREMY C. and BOURNE, NEIL K.},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Apr 09 00:00:00 EDT 2007},
month = {Mon Apr 09 00:00:00 EDT 2007}
}

Conference:
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  • The Bauer PVDF stress-rate gauge has been used to study the response of the cited polymers from measurements at the impact surface and in-situ'' at sample thicknesses of 1.5 and 3 mm. The PVDF stress- rate dependent piezoelectric output combined with appropriate signal recording techniques allow accurate recording over the broad range of stress rates encountered during shock compression of polymers. Strong viscous response effects are observed. The release velocity is found to increase strongly with pressure, and the release-rate history is recorded with PVDF as a continuous function of pressure. 12 refs., 4 figs., 1 tab.
  • We investigate dynamic response of Cu{sub 46}Zr{sub 54} metallic glass under adiabatic planar shock wave loading (one-dimensional strain) wjth molecular dynamics simulations, including Hugoniot (shock) states, shock-induced plasticity and spallation. The Hugoniot states are obtained up to 60 CPa along with the von Mises shear flow strengths, and the dynamic spall strength, at different strain rates and temperatures. The spall strengths likely represent the limiting values achievable in experiments such as laser ablation. For the steady shock states, a clear elastic-plastic transition is identified (e.g., in the shock velocity-particle velocity curve), and the shear strength shows strain-softening. However, the elastic-plasticmore » transition across the shock front displays transient stress overshoot (hardening) above the Hugoniot elastic limit followed by a relatively sluggish relaxation to the steady shock state, and the plastic shock front steepens with increasing shock strength. The local von Mises shear strain analysis is used to characterize local deformation, and the Voronoi tessellation analysis, the corresponding short-range structures at various stages of shock, release, tension and spallation. The plasticity in this glass is manifested as localized shear transformation zones and of local structure rather than thermal origin, and void nucleation occurs preferentially at the highly shear-deformed regions. The Voronoi and shear strain analyses show that the atoms with different local structures are of different shear resistances that lead to shear localization (e.g., the atoms indexed with (0,0,12,0) are most shear-resistant, and those with (0,2,8,1) are highly prone to shear flow). The dynamic changes in local structures are consistent with the observed deformation dynamics.« less
  • A molecular dynamics (MD) analysis of conservation of momentum through a shock front is presented. The MD model uses a non-traditional boundary condition that allows simulation in the reference frame of the shock front. Higher order terms proportional to gradients in the density are shown to be non-negligible at the shock front. The simulation is used to study the sequence of thermodynamic states during shock loading. Melting is observed in the simulations, though above the thermodynamic melt curve as is common in homogeneous simulations of melting. High strain-rate tensile loading is applied to the growth of nanoscale voids in copper.more » Void growth is found to occur by plasticity mechanisms with dislocations emerging from the void surface. [molecular dynamics, shock loading, conservation of momentum, shock melting, void growth]« less