Doctoral Dissertations

Abstract

"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.

Advisor(s)

Rollins, Ronald R.

Committee Member(s)

Gillett, Billy E.
Scott, James J.
Wulfman, David S., 1934-2013
Clark, George Beverley

Department(s)

Mining Engineering

Degree Name

Ph. D. in Mining Engineering

Sponsor(s)

E.I. du Pont de Nemours & Company
United States. Department of Defense

Publisher

University of Missouri--Rolla

Publication Date

1970

Pagination

viii, 84 pages

Note about bibliography

Includes bibliographical references (pages 81-83).

Rights

© 1970 Hemendra Nath Kalia, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Subject Headings

ExplosivesShaped chargesBlastingRock-drills

Thesis Number

T 2388

Print OCLC #

6020361

Electronic OCLC #

853565806

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