Penetration in granite by shaped charge liners of various metals

"The penetration in Missouri red granite by cylindrical charges with metal liners of aluminum 2011 (T-3), aluminum 7075 (T-6), yellow brass, monel, maraging steel (vascomax 250), and copper was measured. Metals having high ductility and moderate compressive strength penetrated deeper than high strength maraging steel. Aluminum required a greater standoff for optimum penetration than the other metal liners tested. Preliminary metallographic studies of the liner metals and slugs showed that the grains had elongated along the slug axis. The metals containing zinc formed very small or no slugs. The granite grains were highly fractured. The holes were discolored and coated with jet metal. Penetration was affected by bedding planes and joints in the rock. Jet characteristics could not be photographed using a high speed framing camera because the view was obscured by the luminous front created by shock waves. Jet tip velocities were measured by pin oscilloscope techniques and were in the range of 7.91 - 9.83 millimeters per microsecond. The rate of penetration in granite was also obtained in this same manner. A mathematical expression was developed to calculate collapse time of cones using three-dimensional collapse criteria"--Abstract, page ii.

Name thesis:degree_name

Ph. D. in Mining Engineering

Grantor

University of Missouri--Rolla

Year dc:date.available

2016

Author dc:creator

• Kalia, Hemendra Nath

• Mining Engineering

Repository record dc:identifier

https://scholarsmine.mst.edu/doctoral_dissertations/2038

OAI identifier oai:identifier

oai:scholarsmine.mst.edu:doctoral_dissertations-3040