Abstract
The object of research is the processes of pulse explosive loading in an explicit formulation for simulation of complex nonlinear dynamics of solids, gases, and their interactions. One of the most problematic areas of modern studies of nonlinear dynamic loads of materials using a numerical analysis is that such studies usually do not take into account the characteristic transition of the stationary deformation zone of the loaded material to the unsteady one and the front pressure and shockwave velocity variation by time. The work is aimed at developing a mathematical model of a pulsed load of materials by a shockwave, developing a mathematical apparatus for calculating the parameters of a shockwave, creating analytical dependences of the interaction of a shockwave with a loaded surface. A study of dynamic explosive loading using software based on an explicit method for solving the equations of continuum mechanics is proposed. In this work, the stress-state equation at a point of the material under pulsed load conditions was further developed, methods for determining the principal stresses and the invariant of the stress tensor, taking into account the pulsed nature of the load, were established. The character of the behavior of the shockwave formed as a result of the detonation of the explosive has been established. Analytical dependences of the interaction of a shockwave with a loaded surface are compiled. A mathematical apparatus has been developed for calculating such parameters of the shockwave as the detonation front pressure and its change in time and the velocity of the shockwave at the moment when it reaches the surface. Mathematical dependences have been developed and proposed, which, in contrast to the existing ones, make it possible to determine the current values of stresses and strains passing through the points of the actual stress curve, as well as the intensity of stresses and strains under pulse loading of metals. On the basis of theoretical and experimental studies of the parameters of body material deformation under the action of explosive loading, the mechanisms of destruction of the KrAZ «Shrek» and KrAZ «Fiona» (Ukraine) specialized armored vehicles body were clarified to establish the compliance of the declared landmine resistance of vehicles with the STANAG 4569 standardization agreement.
Highlights
According to the United Nations Office for the Coordination of Humanitarian Affairs (OCHA), the Convention on the Prohibition of the Use, Stockpiling, Production and Transfer of Anti-Personnel Mines and on their Destruction since 1997 did not reduce their global application, as it is estimated that more than 100 million mines are installed in 60 countries around the world
ANSYS Autodyn is an analytical tool for solving problems in explicit statement for simulation of complex nonlinear dynamics of solids, liquids, gases and their interaction
The object of research is the processes of pulse explosive loading in an explicit formulation for simulation of complex nonlinear dynamics of solids, gases, and their interactions associated with the transition from a statio nary deformation zone to a nonstationary one with force intensification
Summary
According to the United Nations Office for the Coordination of Humanitarian Affairs (OCHA), the Convention on the Prohibition of the Use, Stockpiling, Production and Transfer of Anti-Personnel Mines and on their Destruction since 1997 did not reduce their global application, as it is estimated that more than 100 million mines are installed in 60 countries around the world. Landmines (including anti-vehicle) are widely used in modern conflicts [1]. The actual standard for armored military vehicles is the compliance of the MRAP class (Mine Resistant Ambush Protected). The NATO STANAG 4569 standardization agreement defines necessary to class MRAP vehicles crew protection in case of landmine blast action (charge weight is 6 kg in TNT equivalent) under any of the wheels or tracks and under the hull center [2]. Numerical simulation of processes allows to obtain additional information on complex physical phenomena, which is not available in experimental research methods. ANSYS Autodyn is an analytical tool for solving problems in explicit statement for simulation of complex nonlinear dynamics of solids, liquids, gases and their interaction. It represents a powerful tool for TECHNOLOGY AUDIT AND PRODUCTION RESERVES — No 3/1(59), 2021
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