Meso-Macro Energy Exchange in Shock Deformed and Fractured Solids

  • Yuri I. Mescheryakov
Part of the Shock Wave and High Pressure Phenomena book series (SHOCKWAVE)


One of primary problems in the dynamics of materials is developing an understanding of the coupling between microstructural features of a material and its macroscopic response on impact. Many theoretical models based on the microstructure dynamics, in particular on dislocation dynamics, have been developed to describe the macroscopic behavior of material under both uniaxial stress and uniaxial strain conditions. Nevertheless, this coupling is poorly understood both qualitatively and quantitatively. This is due to the incorrect, but commonly used, approach of linking the macroscopic response on impact with data describing the microstructural state that prevails after dynamic loading. In reality, adequate mathematical modeling of dynamic processes should be based on microstructural kinetics data obtained in real time, i.e., during the dynamic deformation and fracture processes. This requires that experimental technique provide not only measurements of macroscopic response such as the time-resolved freesurface-velocity profile for impacted specimens, but also kinetic characteristics of their internal structure. These characteristics provide information on the relative mobility of elementary carriers of deformation (ECD). Because the motion of ECDs in a heterogeneous medium is stochastic in nature, their kinetics must normally be described in the language of the particle velocity distribution function and its statistical moments. The term mesoparticle kinetics, as used herein, has the same meaning as in the physical kinetics of fluids and gases, i.e., it refers to the behavior of the particles as characterized by a distribution in velocity space. The width of that distribution, or the square root of the particle velocity dispersion, is defined in Section 5.2 as a mean velocity fluctuation of the mesostructure. This mean velocity fluctuation is a quantitative characteristic of mesoparticle kinetics.


Particle Velocity Impact Velocity Fracture Solid Velocity Fluctuation Velocity Dispersion 
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© Springer Science+Business Media New York 2003

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  • Yuri I. Mescheryakov

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