Accession Number : ADA158233


Title :   Cowboy Trails. Phase I. Small-Scale Explosive Tests in Salt Domes. Part 1. Goals, Methods and Conclusions. Part 2. Experimental Program


Descriptive Note : Final rept. Jun 1979-Jun 1980


Corporate Author : APPLIED THEORY INC LOS ANGELES CA


Personal Author(s) : Trulio, John G ; Ford, Franklin C


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a158233.pdf


Report Date : 15 Jun 1983


Pagination or Media Count : 69


Abstract : The energies of stock chemical explosives (CEs) most often vary with confinement. In Phase I of the Cowboy Trails program CE spheres were fired in dome salt, in mines near Hockley and Grand Saline, Texas. The Hockley charges weighed approx. 20-30 gm and those at Grand Saline approx. 75 gm. All were center-lit and buried deeply enough for containment. From the volumes of the resulting cavities and the known energy of one of the CEs (PETN), an energy, e sub o, of 4.50 kilojoules (kj) per gram was found for nitromethane (NM, another of the CEs). Constancy of the ratio of cavity-volume-increase (Delta V sub C) to the energy (E) released, which theory and experiment both roughly aver, underlay the deduction of e sub o. On that basis, values of e sub o were also found for RDX, and for TNT at loading densities of 1.59 and 1.21 gm/cc. For Pelletol, tamped as in Project Cowboy, e sub o then becomes accessible via Cowboy-size bursts (Phase II); safety precludes the use of PETN at that scale, and NM takes its place. NM's e-value is now uncertain to the extent of approx. 8%; the r.m.s. scatter of its measured values is approx. 5%. Cavities blown in the domes at Hockley and Winnfield, La. had the same Delta V sub c/E-value, within a margin of error set by the uncertainty in e sub o for Pelletol. Likewise, it appears that the change of dome and scale from Hockley to Grand Saline had no significant effect on Delta V sub c per unit mass of PETN, while Delta V sub C increased by approx. 8% per unit mass of NM. if so, then e sub o varies with charge-size for the small masses of NM in Phase I.


Descriptors :   *EXPLOSIVES , *UNDERGROUND EXPLOSIONS , CAVITIES , CHEMICAL ORDNANCE , CONFINEMENT(GENERAL) , DENSITY , DOMES(STRUCTURAL FORMS) , ERRORS , EXPLOSIVE CHARGES , MASS , MINING ENGINEERING , NITROMETHANE , PETN , RATIOS , RDX , SALTS , SCALE , SCALING FACTOR , SPHERES , TEST METHODS , TEXAS , TNT


Subject Categories : Ammunition and Explosives
      Explosions


Distribution Statement : APPROVED FOR PUBLIC RELEASE