Permanent Periodic Surface Deformations Due to a Traveling Jet

[+] Author and Article Information
G. R. Abrahamson

Stanford Research Institute, Menlo Park, Calif.

J. Appl. Mech 28(4), 519-528 (Dec 01, 1961) (10 pages) doi:10.1115/1.3641777 History: Received September 26, 1960; Online September 16, 2011


A steel bullet in the form of a right circular cylinder which strikes a 10-mil-thick plane lead target at 45 deg incidence and at 2700 fps acquires on its front surface a series of corrugations, or waves, approximately 10 mils in amplitude and 40 mils in wave length. This phenomenon is investigated from a hydrodynamic point of view and it is found that similar waves develop at much lower velocities with materials which are viscous liquids under ordinary conditions. A mechanism of wave formation based on a hydrodynamic instability is presented.

Copyright © 1961 by ASME
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