PSI - Issue 2_B

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Yurii Meshcheryakov et al. / Procedia Structural Integrity 2 (2016) 477–484 Yu.I. Meshcheryakov, A,K. Divakov, N.I. Zhigacheva, G.V. Konovalov / Structural Integrity Procedia 00 (2016) 000–000

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4. Conclusions The brittle material tested – gabbro-diabase, fused quartz and gray iron - put up the resistance to shock compression till a reversible momentum and energy exchange between mesoscale-1 (0,1÷10 μm) and mesoscale-2 (50-500 μm) takes place. Mechanisms of momentum and energy exchange are the pulsations of structural elements. There is threshold particle velocity at which structural transition at the mesoscale-2 becomes irreversible. In the brittle materials, the structural irreversibility results in lost of the resistance to tension. The time interval for structural transition equals 30-50 ns gabbro-diabase and 17-23 ns for fused quartz. References Aero,E.L., 2000. Microscale deformations in two-dimensional lattice structural transitions under critical shear. Fizika tverdogo tela (Physics of Solid) 42(6), 1147-1153. Meshcheryakov, Yu.I., Divakov, A.K., 1994. Multiscale kinetics of micro-structure and strain- rate dependence of materials. Dymat Journal 1(4), 271-287. Meshcheryakov, Yu.I., Divakov, A.K., Zhigacheva, N.I., Barakhtin, B.K., 2008. Dynamic structures in copper. Physical Review, B., 64301-64316. Sadovskii, М.А., 1989. Discrete properties of geophysical medium. Moscow. Nauka, 173.