Accession Number : AD0671671

Title :   ROCK DRILLABILITY FOR MILITARY APPLICATIONS.

Descriptive Note : Final rept.,

Corporate Author : BUREAU OF MINES MINNEAPOLIS MINN TWIN CITIES MINING RESEARCH CENTER

Personal Author(s) : Paone,James ; Unger,Harold F. ; Tandanand,Sathit

Report Date : 22 APR 1968

Pagination or Media Count : 80

Abstract : Drillability as the measure of drilling performance has been based on hardness and toughness of rocks, power input to the drill compared with total volume of hole, and penetration related to resistive forces on the applied penetrative forces. The report describes different drilling systems and their drillability in various rocks and derives drillability equations for rotary and for percussive drill systems, and rock strength characteristics as a guide for predicting drilling in military applications. Factors such as flushing medium and bit size and their effects on drillability are also evaluated. (Author)

Descriptors :   (*ROCK, DRILLING), (*MILITARY OPERATIONS, DRILLING), HARDNESS, TOUGHNESS, PENETRATION, EQUATIONS, DRILLING MACHINES, DRILLS, TUNGSTEN ALLOYS, CARBIDES, MODULUS OF ELASTICITY, TENSILE PROPERTIES, COMPRESSIVE PROPERTIES, CLASSIFICATION, POWER, PARTICLE SIZE, OPERATION

Subject Categories : Geology, Geochemistry and Mineralogy
      Machinery and Tools
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE