Dynamics response of polyethylene polymer nanocomposites to shock wave loading |
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| Authors: | Yao Fu John Michopoulos Jeong‐Hoon Song |
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| Affiliation: | 1. Department of Civil, Environmental, and Architectural Engineering, University of Colorado, Boulder, Colorado;2. Computational Multiphysics Systems Laboratory, Naval Research Laboratory, Washington, District of Columbia |
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| Abstract: | The shock response of polyethylene polymer modified by nanoparticles (NP) is investigated using a coarse‐grained molecular dynamics simulation. The us‐up Hugoniot analysis yields a linear relationship under the range of particle velocity investigated, in agreement with previous simulation and experimental results. NP addition improves the mechanical properties of the composites, as reflected by the increased Young's modulus and yield strength especially in the case of shorter chain length of polymer. This is directly related to the increased shock impedance with NP volume fraction, as demonstrated by the enhanced pressure in the shocked state, slightly reduced microscopic deformation, and increased shock velocity. The layered structure with alternate soft and hard regions, with NP addition only in the hard regions, leads to significantly enhanced microscopic deformation in the soft regions. It is also important that the shock impedance difference between the soft and hard region to be large enough to facilitate the energy absorption through plastic deformation in the soft regions. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015 , 53, 1292–1302 |
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| Keywords: | coarse‐grained molecular dynamics nanocomposites polymer nanocomposites polyethylene shock response structure‐property relation |
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