Shock-wave propagation through pristine a-SiC and carbon-nanotube-reinforced a-SiC matrix composites

Makeev, Maxim A.; Sundaresh, Suman; Srivastava, Deepak

doi:10.1063/1.3152587

Cited by 19 publications

(12 citation statements)

References 49 publications

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“…Therefore, the systems are different from the seemingly equivalent set-ups, widely used in the studies of shock-wave propagation through porous media. In the case of shock-wave propagation, a density increase in the after-shock regions takes place, with the shocked material density being in excess of its thermodynamic equilibrium value [29][30][31][32]. In the case, considered herein, we rather observe a nearly complete separation of bimodal systems in solid domains and void, with density of these solid domains gradually approaching its equilibrium value for the void-free state (ρσ 3 = 1.25 [33]).…”

Section: Resultsmentioning

confidence: 99%

Structural transformations in porous glasses under mechanical loading. II. Compression

Priezjev,

Makeev

2017

Preprint

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The role of porous structure and glass density in response to compressive deformation of amorphous materials is investigated via molecular dynamics simulations. The disordered, porous structures were prepared by quenching a high-temperature binary mixture below the glass transition into the phase coexistence region. With decreasing average glass density, the pore morphology in quiescent samples varies from a random distribution of compact voids to a porous network embedded in a continuous glass phase. We find that during compressive loading at constant volume, the porous structure is linearly transformed in the elastic regime and the elastic modulus follows a power-law increase as a function of the average glass density. Upon further compression, pores deform significantly and coalesce into large voids leading to formation of domains with nearly homogeneous glass phase, which provides an enhanced resistance to deformation at high strain.

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Section: Resultsmentioning

confidence: 99%

Structural transformations in porous glasses under mechanical loading. II. Compression

Priezjev,

Makeev

2017

Preprint

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“…Some works investigate the propagation of shock-wave in the crystal material by MD and gained satisfactory results (Arman et al, 2010;Bringa et al, 2004;Makeev et al, 2009). In addition to crystals, several works simulated the propagation of shock-wave in the polymer.…”

Section: Ec 383mentioning

confidence: 99%

Atomic-scale simulation of hugoniot relations and energy dissipation of polyurea under high-speed shock

Yao

Chu

et al. 2020

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Purpose The purpose of this paper is to calculate the Hugoniot relations of polyurea; also to investigate the atomic-scale energy change, the related chain conformation evolution and the hydrogen bond dissociation of polyurea under high-speed shock. Design/methodology/approach The atomic-scale simulations are achieved by molecular dynamics (MD). Both non-equilibrium MD and multi-scale shock technique are used to simulate the high-speed shock. The energy dissipation is theoretically derived by the thermodynamic and the Hugoniot relations. The distributions of bond length, angle and dihedral angle are used to characterize the chain conformation evolution. The hydrogen bonds are determined by a geometrical criterion. Findings The Hugoniot relations calculated are in good agreement with the experimental data. It is found that under the same impact pressure, polyurea with lower hard segment content has higher energy dissipation during the shock-release process. The primary energy dissipation way is the heat dissipation caused by the increase of kinetic energy. Unlike tensile simulation, the molecular potential increment is mainly divided into the increments of the bond energy, angle energy and dihedral angle energy under shock loading and is mostly stored in the soft segments. The hydrogen bond potential increment only accounts for about 1% of the internal energy increment under high-speed shock. Originality/value The simulation results are meaningful for understanding and evaluating the energy dissipation mechanism of polyurea under shock loading, and could provide a reference for material design.

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“…[6][7][8]18 For instance, a recent MD work explored the shock response of the CNT-SiC composites modeled with the Tersoff potential. 14 Our shock simulations yield the Hugoniots of phenolic resin and its CNT composites, and reveal the mechanisms for plasticity and the anisotropy in the shock response of the composites with regularly ordered CNTs. This work is presented as follows: Sec.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Despite extensive shock experiments on these materials, 1-4,9-12 the underlying deformation and "phase change" mechanisms have been elusive due to the daunting complexities inherent in polymeric materials. While the challenge remains and numerical simulations of such materials are computationally intractable and expensive, reactive and nonreactive molecular dynamics ͑MD͒, coarse-grain dynamics and first-principles-based modeling/simulations are advantageous in revealing the microscopic details.…”

Section: Introductionmentioning

confidence: 99%

“…While the challenge remains and numerical simulations of such materials are computationally intractable and expensive, reactive and nonreactive molecular dynamics ͑MD͒, coarse-grain dynamics and first-principles-based modeling/simulations are advantageous in revealing the microscopic details. [6][7][8][13][14][15][16] Direct MD shock simulations of polymers and polymer composites are rare; some previous MD simulations explored the shock response of molecular crystals and chemistry. 17 As a first attempt on direct MD simulations of shock response of polymers and polymer composites, we choose phenolic resin and its carbon-nanotube ͑CNT͒ composite in current study ͓Figs.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic response of phenolic resin and its carbon-nanotube composites to shock wave loading

Arman

Luo

et al. 2011

Journal of Applied Physics

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We investigate with nonreactive molecular dynamics simulations the dynamic response of phenolic resin and its carbon-nanotube ͑CNT͒ composites to shock wave compression. For phenolic resin, our simulations yield shock states in agreement with experiments on similar polymers except the "phase change" observed in experiments, indicating that such phase change is chemical in nature. The elastic-plastic transition is characterized by shear stress relaxation and atomic-level slip, and phenolic resin shows strong strain hardening. Shock loading of the CNT-resin composites is applied parallel or perpendicular to the CNT axis, and the composites demonstrate anisotropy in wave propagation, yield and CNT deformation. The CNTs induce stress concentrations in the composites and may increase the yield strength. Our simulations suggest that the bulk shock response of the composites depends on the volume fraction, length ratio, impact cross-section, and geometry of the CNT components; the short CNTs in current simulations have insignificant effect on the bulk response of resin polymer.

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Shock-wave propagation through pristine a-SiC and carbon-nanotube-reinforced a-SiC matrix composites

Cited by 19 publications

References 49 publications

Structural transformations in porous glasses under mechanical loading. II. Compression

Structural transformations in porous glasses under mechanical loading. II. Compression

Atomic-scale simulation of hugoniot relations and energy dissipation of polyurea under high-speed shock

Dynamic response of phenolic resin and its carbon-nanotube composites to shock wave loading

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