Study of the conditions of fracture at explosive compaction of powders

Joint theoretical and experimental investigations have allowed to realize an approach with use of mathematical and physical modeling of processes of a shock wave loading of powder materials.In order to gain a better insight into the effect of loading conditions and, in particular, to study the effect of detonation velocity, explosive thickness, and explosion pressure on the properties of the final sample, we numerically solved the problem about powder compaction in the axisymmetric case.The performed analysis shows that an increase in the decay time of the pressure applied to the sample due to an increase of the explosive thickness or the external loading causes no shrinkage of the destructed region at a fixed propagation velocity of the detonation wave. Simultaneously, a decrease in the propagation velocity of the detonation wave results in an appreciable shrinkage of this region

Сравнение реакции гомогенной среды на динамическое воздействие одиночного и сегментированного стрежней

A series of calculations of the interaction of single and segmented rods with massive blocks and plates of finite thickness have been performed. Comparisons with experimental data for verification of material parameters under dynamic conditions have been made. Both qualitative and sufficiently realistic correspondence of the results of numerical modeling to the experimental data, such as the non- monotonic dependence of the cavity depth of segmented rods on the size of the gap between the segments, has been obtainedВыполнены серии расчетов взаимодействия сплошных и сегментированных стержней с массивными блоками и пластинами конечной толщины. Проведены сравнения с данными экспериментов для верификации параметров материалов в динамических условиях. Получено как качественное, так и достаточно реалистичное соответствие результатов численного моделирования данным экспериментов, таких как немонотонная зависимость глубины каверны сегментированных стержней от величины зазора между сегментам