Gerasimov A.V.   Pashkov S.V.   Khristenko Y.F.  

High-speed interaction of natural and man-made particles with elements of the spacecraft from the brittle and ductile materials

Reporter: Gerasimov A.V.

The work represents a theoretical and experimental study concerning the high-speed interaction of natural and technogenic particles with the glass and asbestos-reinforced laminate targets of finite thickness. These materials are widely used as the structural elements of spacecrafts such as windows, glass in optical devices, heat shields, etc.
This work deals with the impact of glass and asbestos-reinforced laminate samples with aluminum particles which simulate space debris and with ice and granite particles which simulate the natural particles of space bodies.
Three-dimensional simulation for the interaction of targets with high-speed projectiles is based on the equations which describe the spatial adiabatic motion of a solid compressible medium and comprise the equation of mass conservation, the momentum equation and the energy equation. The calculation technique uses tetrahedral cells and is based on the combination of the Wilkins method for the calculation of internal body points and the Johnson method for the calculation of contact interactions. A three-dimensional region is divided into tetrahedrons by using the numerical codes for the automatic construction of a mesh.
The fracture of glass, ice, and granite is considered to be the fracture of a brittle material without plastic strain that is typical for the strain of metals. The Johnson-Cook model is used to simulate the behavior of elastic and plastic materials such as aluminum and steel, and the model of Johnson-Holmquist is used to simulate brittle materials. Three-dimensional simulation allows the natural heterogeneous structure of materials to be considered, since it influences on the distribution of physical and mechanical characteristics over the volume of structural elements and is one of the main factors determining the material fracture behavior.
This factor can be considered using the equations of deformable solid mechanics and the probabilistic distribution law of physical and mechanical characteristics over the volume of the construction under study. The natural fragmentation of the target and projectiles are simulated by introducing a probabilistic distribution of the initial defects in the structure of material. The available light-gas guns (Institute of Applied Mathematics and Mechanics) are used to study the high-speed interaction processes.
This work was partially founded the Russian Foundation for Basic Research, according to research projects No.16-08-00037_a, No.15-08-06689_a and No. 15-08-02265_a.

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