| Abstract: | With the study of the collision of metallic plates accelerated by an explosion, investigation of plastic deformations in the collision zone is of great importance. In 1] a method is expounded for investigations of deformation with explosion welding under conditions of wave formation; the method consists of the pressing of a thin wire into the metallic plate. With collision of the plates, the flowing metal carries the wire with it; the change in the form of the latter makes it possible to evaluate the character of the plastic deformation in the collision zone. From an investigation of the deformation of the wires, such important characteristics as the viscosity of the metals can be found. The method set forth in 1] is one of the few means of investigating the deformation of metals with high-speed collisions. The difficulties in the investigation are bound up with the small times of the process and with the high pressures, developing with an explosion and demolishing the experimental unit. In 1], from an analysis of viscous flow during the collision of plates, a dependence of the shift on the distance to the interface between the materials, described by a parabola, is derived. It is noted that, near the interface, the theoretical and experimental results differ considerably. It is important to make an attempt at a theoretical analysis of the wire deformation if, with the collision of metallic plates, a jet is formed and the interface between the materials is even. In this case, the flow differs strongly from the flow under conditions of wave formation 2], and near the interface the flow cannot be described by a parabolic dependence; this dependence will probably be exponential. To describe flow with the formation of a jet, in 3] a model of an ideal liquid is employed. Since the analysis of a collision between viscous jets with a free boundary is bound up with serious difficulties, in the first approximation it is advisable to consider the deformation of the liquid line with the deformation of ideal jets.Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, No. 6, pp. 65–71, November–December, 1977.The author wishes to express his thanks to N. S. Kozin and V. V. Efremov for a number of valuable observations with an evaluation of the work, and N. M. Maksimova for her aid in making the numerical calculation. |
