The mechanism of instability and localized reaction in the explosively driven collapse of thick walled Ni-Al laminate cylinders

Chiu, Po-Hsun; Olney, Karl; Higgins, Andrew; Serge, Matthew; Nesterenko, V. F.

doi:10.1063/1.4811837

Cited by 22 publications

(16 citation statements)

References 36 publications

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“…Studies of the shock responses of metallic multilayered materials may be motivated by the potential applicability of such materials in shock-damping devices to attenuate the eff ects of impacts and blasts. Large diff erences in the mechanical properties of the component layers induce periodic heterogeneities in multilayer composites that lead to impedance mismatches at the interfaces (Holmes and Tsou (1972); Johnson et al (1994); Herbold et al (2008); Neel and Thadhani (2011); Specht et al (2012); Chiu et al (2013)). The interaction of shockwaves with these interfaces can change the propagating wave structure and the attenuation of the shockwaves.…”

Section: Introductionmentioning

confidence: 99%

“…At higher particle velocities, the experimentally determined equation of state deviated from the CTH-predicted inert response. Chiu et al (2013) conducted thick-walled cylinder experiments and simulations of the dynamic collapse of Ni-Al concentric laminate cylinders. They demonstrated the phenomenon of cooperative buckling originating in the innermost layers.…”

Section: Introductionmentioning

confidence: 99%

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Shock-induced plasticity in semi-coherent {111} Cu-Ni multilayers

Xiang

Liao

Wang

et al. 2018

International Journal of Plasticity

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Using atomistic simulations, dislocation dynamics modeling, and continuum elastic-plastic stress-wave theory, we present a systematic investigation on shock-induced plasticity in semi-coherent Cu-Ni multilayers. The features of stress-wave evolutions in the multilayers, including wave-front stress attenuation and strong interfacial discontinuities, are revealed by atomistic simulations. Continuum models are proposed to explain the shockwave propagation features. The simulations provide insight into microplasticity behaviors including interactions between lattice and misfit dislocations. The formation of hybrid Lomer-Cottrell locks through the attraction and combination of lattice and misfit dislocations is a major mechanism for trapping gliding lattice dislocations at interfaces. The relationship between dislocation activity and dynamic stress-wave evolution history is explored. The hybrid Lomer-Cottrell locks can dissociate under shock compression or reverse yielding. This dissociation facilitates slip transmission. The influence of coherent stress causes direction dependency in the slip transmission: a lattice dislocation is transmitted more smoothly across an interface from Ni to Cu than from Cu to Ni. The interaction forces between lattice and misfit dislocations are calculated using dislocation dynamics code. Lattice dislocation nucleation from semi-coherent interfaces under shock compression is also reported.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Shock-induced plasticity in semi-coherent {111} Cu-Ni multilayers

Xiang

Liao

Wang

et al. 2018

International Journal of Plasticity

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“…Shock initiation of laminate Ni–Al composite samples was studied using so called “Thick‐Walled Cylinder Method” presented schematically in Figure . A cylindrical RSM sample is placed inside a copper tube.…”

Section: Characterization Of Rsmsmentioning

confidence: 99%

Reactive Structural Materials: Preparation and Characterization

Hastings

Dreizin

2017

Adv Eng Mater

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Reactive structural materials, which can serve both as structural elements as well as a source of chemical energy released upon initiation have emerged as an important class of metal-based composites for use in various energetic systems. Such materials rely on a variety of exothermic reactions, from oxidation to formation of metal-metalloid and intermetallic phases. The rates of these reactions are as important as the energy that may be released, in order for them to occur at the time scales compatible with the requirements of applications. Therefore, chemical composition, scale at which reactive components are mixed, and the structure and morphology of materials are important and can be controlled by the method of preparation and compaction of the composite materials. Methods of preparation of the composite structures are briefly reviewed as well as methods of characterization of their mechanical and energetic properties. In addition to common thermo-analytical and static mechanical property measurements, dynamic tests of mechanical properties as well as ignition and combustion experiments are necessary to understand the fragmentation, initiation, and heat release expected for these materials when they are stimulated by an impact, shock, or rapid heating. Reaction mechanisms are studied presently for the thin layers and small samples of reactive materials initiated in carefully designed experiments. In other experiments, impact and explosive initiation are characterized for larger material compacts in the conditions imitating practical scenarios. Examples of results describing thermal, impact, and explosive initiation of some of the reactive materials are presented.

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“…1) with an outer radius of 12.5 mm. This steel cylinder was part of a larger assembly of the TWC set-up used to investigate the mechanism of plastic flow instability in various homogeneous and laminate materials [9,29,30]. A Cu jacket (referred to as the outer Cu driver tube in the TWC method) with a thickness of 3.38 mm was placed on the outside of the steel cylinder.…”

mentioning

confidence: 99%

“…A Cu jacket (referred to as the outer Cu driver tube in the TWC method) with a thickness of 3.38 mm was placed on the outside of the steel cylinder. The collapse of the copper cylinder was driven by gelled nitromethane explosive (96% nitromethane, 4% PMMA) diluted 5% by mass with glass microballoons [29,30] with a thickness of 14 mm. The explosive was initiated from above to ensure a uniform detonation profile as the detonation wave passed axially along the sample.…”

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confidence: 99%

Localized microjetting in the collapse of surface macrocavities

et al. 2015

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This paper focuses on the multiscale mechanism of collapse of hemispherical annular surface macrocavities in steel caused by high strain, high strain rate plastic flow of copper. Experiments and simulations revealed that a two-stage process is responsible for the observed microjetting phenomena: the formation of lateral copper microjets from the localized shear flow in copper at the interface during the filling of the cavity, and their subsequent collision at the apex of the macrocavity generating two additional horizontal microjets. The lengths of these microjets were an order of magnitude smaller than the cavity size, but linearly scaled with cavity radius. This process of microjet development is sensitive to the cavity geometry and it is unlike the previously observed jetting phenomena in cavitation, impact crater collapse, or shock-induced cavity collapse.Introduction -This paper focuses on the phenomena of microjetting in the collapse of

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The mechanism of instability and localized reaction in the explosively driven collapse of thick walled Ni-Al laminate cylinders

Cited by 22 publications

References 36 publications

Shock-induced plasticity in semi-coherent {111} Cu-Ni multilayers

Shock-induced plasticity in semi-coherent {111} Cu-Ni multilayers

Reactive Structural Materials: Preparation and Characterization

Localized microjetting in the collapse of surface macrocavities

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