Meso-Macro Energy Exchange in Shock Deformed and Fractured Solids

Mescheryakov, Yuri I.

doi:10.1007/978-1-4613-0013-7_5

Cited by 10 publications

(8 citation statements)

References 8 publications

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“…Effective stress near the spall plane can be simulated at different materials and impact velocities but not discussed here. A multiscale descriptive framework for describing effects of micro-or mesostructures on wave propagation in solids under impact loading has been developed [163]. The initiation of spall fracture may be controlled by grain and phase boundaries, in agreement with experimental observations.…”

Section: Journal Of Powder Technologysupporting

confidence: 56%

Recent Progress in Processing of Tungsten Heavy Alloys

Şahin

2014

Journal of Powder Technology

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Tungsten heavy alloys (WHAs) belong to a group of two-phase composites, based on W-Ni-Cu and W-Ni-Fe alloys. Due to their combinations of high density, strength, and ductility, WHAs are used as radiation shields, vibration dampers, kinetic energy penetrators and heavy-duty electrical contacts. This paper presents recent progresses in processing, microstructure, and mechanical properties of WHAs. Various processing techniques for the fabrication of WHAs such as conventional powder metallurgy (PM), advent of powder injection molding (PIM), high-energy ball milling (MA), microwave sintering (MW), and spark-plasma sintering (SPS) are reviewed for alloys. This review reveals that key factors affecting the performance of WHAs are the microstructural factors such as tungsten and matrix composition, chemistry, shape, size and distributions of tungsten particles in matrix, and interface-bonding strength between the tungsten particle and matrix in addition to processing factors. SPS approach has a better performance than those of others, followed by extrusion process. Moreover, deformation behaviors of WHA penetrator and depleted uranium (DU) Ti alloy impacting at normal incidence both rigid and thick mild steel target are studied and modelled as elastic thermoviscoplastic. Height of the mushroomed region is smaller forα=0.3and it forms sooner in each penetrator as compared to that forα=0.2.

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Section: Journal Of Powder Technologysupporting

confidence: 56%

Recent Progress in Processing of Tungsten Heavy Alloys

Şahin

2014

Journal of Powder Technology

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“…The pattern of the vortex structures resulting from microtwinning (see Figs. [6][7][8][9] suggests an equilibrium nature of the energy exchange between the mesoscale and macroscale. Other structural formations arise in the absence of dynamic equilibrium.…”

Section: Microstructural Studiesmentioning

confidence: 99%

“…The particle velocity dispersion D 2 characterizes the energy of pulsating motion at the mesoscale, while the product of the particle velocity defect Δu into the material density determines the quantity of motion expended in triggering velocity pulsations. Previously [6], it has been found that in dynamically deformable heterogeneous media, the velocity defect and dispersion are linked by the relation…”

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confidence: 99%

“…The aforesaid directly follows from the criterion of transition to the structurally unstable state obtained in [6]:…”

mentioning

confidence: 99%

“…Only fragmentary studies have been made in the area of multiscale dynamic plasticity because of their complexity and high cost. At the same time, there are a number of experimental facts which allow one to concretely define the mechanics at the mesoscale and calculate new dynamical variables [5][6][7]: 1) the velocity distribution due to velocity pulsations (by virtue of the condition of continuity of the medium, the existence of a velocity distribution implies three-dimensional motion of the medium at the mesoscale);…”

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confidence: 99%

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Transition of Shock-Loaded Metals to a Structurally Unstable State

Meshcheryakov

Zhigacheva

Divakov

et al. 2010

J Appl Mech Tech Phy

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The transition of M3 copper to a structurally unstable state was studied in a series of experiments with shock loading under uniaxial deformation conditions. The threshold strain rate was determined at which the motion of the structurally unstable material reaches an equilibrium regime of energy exchange between the mesoscale and the macroscale -the so-called Kolmogorov statistical equilibrium regime. The notions of the representative volume and elementary pulse of energy exchange between the mesoscale and macroscale are introduced. Visualization conditions of localized-shear bands and rotation structures are found by optical, scanning, and transmission electron microscopy.Key words: shock wave, structurally unstable state, energy exchange between mesoscale and macroscale, velocity dispersion, velocity defect.

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The Shock-Induced Planar Wave Propagation in Condensed Matter

Хантулева

2022

Shock Wave and High Pressure Phenomena

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Meso-Macro Energy Exchange in Shock Deformed and Fractured Solids

Cited by 10 publications

References 8 publications

Recent Progress in Processing of Tungsten Heavy Alloys

Recent Progress in Processing of Tungsten Heavy Alloys

Transition of Shock-Loaded Metals to a Structurally Unstable State

The Shock-Induced Planar Wave Propagation in Condensed Matter

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