Shock-induced structural transitions and dynamic strength of solids

Heterogeneous deformation and spall of an extruded tungsten alloy: plate impact experiments and crystal plasticity modeling

“…Mescheryakov and coworkers (Mescheryakov, 2003;Mescheryakov et al, 2004) developed a multiscale descriptive framework for describing effects of micro-or meso-structures on wave propagation in solids under impact loading. In their framework, dispersions of particle velocities are analyzed at three scales of increasing characteristic length: mesolevel-1, mesolevel-2, and macroscale.…”

Registration of Free Surface Velocity Dispersion of Iron and Steel Samples by Optical Lever Method

“…I. Mesheryakov proposed an explanation for a decrease in mirror reflection component of laser emission from initially polished surface of the polycrystalline sample at the cost of disordered orientation of grain blocks and arising of velocity dispersion of analyzed area of sample's free surface at the output of intense plastic waves [4][5][6][7]. I. Mesheryakov proposed an explanation for a decrease in mirror reflection component of laser emission from initially polished surface of the polycrystalline sample at the cost of disordered orientation of grain blocks and arising of velocity dispersion of analyzed area of sample's free surface at the output of intense plastic waves [4][5][6][7].…”

“…I. Mesheryakov proposed an explanation for a decrease in mirror reflection component of laser emission from initially polished surface of the polycrystalline sample at the cost of disordered orientation of grain blocks and arising of velocity dispersion of analyzed area of sample's free surface at the output of intense plastic waves [4][5][6][7]. A threshold of structural stability loss for steels was estimated in [4][5][6][7] by plastic wave amplitude being only several times higher than Hugoniot elastic limit of the material HEL xx xx σ σ ≥ * . For high-rate loading of flat plate targets the laboratory gas gun was used allowing the acceleration of plane steel impactors ∅37×2 mm up to 0.2-0.4 km/s.…”

“…The purpose of this work was a verification of phenomena discovered in [4][5][6][7] and consisted in relationship of in-situ registrated free surface velocity dispersion with micro-and mesostructures of materials investigated. Verification must be carried out with using independent diagnostic method and in more wider range of stress waves, where not only strong plastic wave in initial α-phase is realized, but also shockinduced α-ε-phase transition is observed.…”

“…With advances in laser interferometric methods of diagnostics of free surfaces of construction material samples at their shock-wave loading a possibility has evolved of recording the features of material's elastic-plastic behavior, related to their structure heterogeneity [1][2][3][4][5][6][7]. The iron with fine and coarse grains, as well as ferrite-pearlitic steels in delivery state and hardened, are the materials being interesting for studying such features in connection with the presence of α-ε -polymorphic transformation in them.…”