Comparative Analysis of Methods for Modeling the Penetration and Plane-Parallel Motion of Conical Projectiles in Soil
V. G. Bazhenov1, A. M. Bragov1, A. Yu. Konstantinova1,2, V. L. Kotov1
1Lobachevskii Research Institute of Mechanics Nizhny Novgorod State University, Nizhny Novgorod, 603950 Russia
2Bakhirev State Scientific Research Institute of Mechanical Engineering, Dzerzhinsk, 606002 Russia
Keywords: удар, проникание под углом к поверхности, конический ударник, упругопластическая среда, модель локального взаимодействия, трехмерное моделирование, угловая скорость вращения, impact, penetration at an angle to the surface, conical projectiles, elastoplastic medium, local interaction model, three-dimensional modeling, angular velocity of rotation
Abstract
This paper presents an analysis of the accuracy of known and new modeling methods using the hypothesis of local and plane sections for solution of problems of the impact and plane-parallel motion of conical bodies at an angle to the free surface of the half-space occupied by elastoplastic soil. The parameters of the local interaction model that is quadratic in velocity are determined by solving the one-dimensional problem of the expansion of a spherical cavity. Axisymmetric problems for each of the meridional section are solved simultaneously neglecting mass and momentum transfer in the circumferential direction and using an approach based on the hypothesis of plane sections. The dynamic and kinematic parameters of oblique penetration obtained using modified models are compared with the results of computer simulation in a three-dimensional formulation. The results obtained with regard to the contact stress distribution along the generator of the pointed cone are in satisfactory agreement.
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