On the Model of Wave Formation during Oblique Symmetrical Collision of Aluminum Plates
S. P. Kiselev, V. P. Kiselev, N. P. Kiselev, V. N. Zaikovskii
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: smooth particle impact (SPH), explosion welding, oblique symmetrical impact, aluminum plates, wave formation
Abstract
The results of numerical simulations using the smooth particle simulation (SPH) method for an oblique symmetrical impact of aluminum plates are presented. These simulations are used to propose a model for wave formation at the plate contact interface. Wave formation is caused by self-oscillations that develop due to the instability of the symmetrical flow and are sustained by the energy of the colliding plates. In the contact region, the material is softened due to heating, so the plate collision can be modeled as an oblique impact of liquid jets. During the oblique impact of the jets, a forward and a reverse jet are formed. Due to disturbances arriving at the contact point, the spreading points of the interacting jets shift, creating a force dipole whose oscillations generate oscillations in the forward and reverse jets. After the forward jet leaves the contact region, its strength properties are restored, so the oscillations are "frozen" as waves at the contact interface. The calculated wavelength agrees satisfactorily with that observed experimentally. The reverse cumulative jet impacts the plate surface, disintegrates, and transforms into a particle cloud.
|
