3D numerical simulation and analysis of railgun gouging mechanism
Author(s): Jin-guo WU, Bo TANG, Qing-hua LIN, Hai-yuan LI, Bao-ming LI, National Key Laboratory of Transient Physics, Nanjing University of Science and Technology
Pages: 90-95
Year: 2016 Issue: 2
Journal: Journal of China Ordnance
Keyword: Impact dynamics; Gouging; Finite element simulation; Rail damage; Railgun;
Abstract: A gouging phenomenon with a hypervelocity sliding electrical contact in railgun not only shortens the rail lifetime but also affects the interior ballistic performance. In this paper, a 3-D numerical model was introduced to simulate and analyze the generation mechanism and evolution of the rail gouging phenomenon. The results show that a rail surface bulge is an important factor to induce gouging. High density and high pressure material flow on the contact surface, obliquely extruded into the rail when accelerating the armature to a high velocity, can produce gouging. Both controlling the bulge size to a certain range and selecting suitable materials for rail surface coating will suppress the formation of gouging. The numerical simulation had a good agreement with experiments, which validated the computing model and methodology are reliable.
Pages: 90-95
Year: 2016 Issue: 2
Journal: Journal of China Ordnance
Keyword: Impact dynamics; Gouging; Finite element simulation; Rail damage; Railgun;
Abstract: A gouging phenomenon with a hypervelocity sliding electrical contact in railgun not only shortens the rail lifetime but also affects the interior ballistic performance. In this paper, a 3-D numerical model was introduced to simulate and analyze the generation mechanism and evolution of the rail gouging phenomenon. The results show that a rail surface bulge is an important factor to induce gouging. High density and high pressure material flow on the contact surface, obliquely extruded into the rail when accelerating the armature to a high velocity, can produce gouging. Both controlling the bulge size to a certain range and selecting suitable materials for rail surface coating will suppress the formation of gouging. The numerical simulation had a good agreement with experiments, which validated the computing model and methodology are reliable.
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