Dmitriy Borisovich Dobritsa (АО "НПО им. С.А. Лавочкина") :


Articles:

539.3+629.78 Modeling of contact interaction of tetrahedral cell edges in solving problems of spatial body high-speed interaction

Dobritsa B. T. (Bauman Moscow State Technical University), Dobritsa D. B. (АО "НПО им. С.А. Лавочкина"), Yashchenko B. Y. (АО "НПО им. С.А. Лавочкина")


doi: 10.18698/2309-3684-2019-3-3956


The paper considers improving techniques of numerical simulation of high-speed interaction of solids, performed for designing spacecraft protection from the impact of micrometeorites and debris particles. An algorithm for the implementation of boundary conditions on the contact surface, designed for numerical simulation using Lagrangian grids and based on the control of mutual penetration of tetrahedral cells of contacting bodies at the intersection of their edges, is proposed. The algorithm is based on the calculation of reaction forces for nodes of tetrahedral cell edges of contacting bodies and correction of velocity vectors of these nodes under condition of non-penetration


Добрица Б.Т., Добрица Д.Б., Ященко Б.Ю. Моделирование контактного взаимодействия ребер тетраэдрических ячеек при решении задач высокоскоростного взаимодействия пространственных тел. Математическое моделирование и численные методы. 2019. № 3.c.39–56.


539.3 Simulation of the interaction process of a high-speed projectile with a three-layer spaced combined barrier

Dobritsa B. T. (Bauman Moscow State Technical University), Pashkov S. V. (Томский государственный университет), Dobritsa D. B. (АО "НПО им. С.А. Лавочкина")


doi: 10.18698/2309-3684-2018-1-7089


The article describes the numerical study of the process of a high-speed projectile interaction with the spaced combined barrier including mesh bumpers which was carried out using the author's numerical realization in a Lagrangian 3D formulation on tetrahedral cells. There was used the deformation fracture criterion for equivalent plastic deformation to calculate contact interactions, the Johnson method and the method of bifurcation on nodes of a computational grid to describe cracks. The boundary condition of ideal sliding on a tangent and impermeability on a normal was used for fragments and contact surfaces. The protective properties of a three-layer spaced barrier with two layers of mesh protection were evaluated in a wide range of impact velocities simulating the effects of micrometeorites and fragments of orbital debris on the structures of spacecraft meteoric protection. High performance of protective mesh bumpers and their advantage in comparison with bulk bumpers are shown. A technique for simulating high-speed impact on the spaced barriers allowing reducing the calculation time for long distances between layers is described.


Добрица Б.Т., Добрица Д.Б., Пашков С.В. Моделирование процесса взаимодействия высокоскоростного ударника с трехслойной разнесенной комбинированной преградой. Математическое моделирование и численные методы, 2018, № 2, с. 70-89.