Accession Number : ADA323423

Title :   Evaluation of the Friability Test (Evaluatie van de Friability Test),

Corporate Author : PRINS MAURITS LABORATORIUM TNO RIJSWIJK (NETHERLANDS)

Personal Author(s) : Scholtes, J. H. ; Van Der Meer, B. J.

PDF Url : ADA323423

Report Date : JAN 1997

Pagination or Media Count : 26

Abstract : In co-operation with SNPE, France, the friability test has been constructed. This test is applied to determine the effect of impact on an explosive substance which is a candidate to be assigned as an Extremely Insensitive Detonating Substance (EIDS). In this test a sample is directed against a steel plate with a velocity of about 150 m/s with the use of a gas gun. After having performed this test, the explosive is tested in the closed vessel' test to assess any changes in the burning characteristic, i.e. the peak pressure and pressure rise rate, due to the impact. The volume of the existing closed vessel' needed to be adjusted in order to fulfil the calibration requirements with respect to peak pressure (80 +/- 0.2 MPa) and pressure rise rate (not more than 15.2 +/- MPa/msec). This calibration was performed using a reference propellant delivered by SNPE. It appears that both calibration requirements could not be met by the 'closed vessel'. The requirement for the peak pressure could be fulfilled, but not for the pressure rise rate. Nine experiments were satisfactory performed using the friability test. Of two explosives, a standard rocket propellant and a PBX-HMX propellant, the burning characteristics were determined with the 'closed vessel' test. Both propellants broke into numerous pieces in the friability test. Nevertheless the results obtained from the 'closed vessel' test show that both the peak pressure and the pressure rise rate are moderate compared to the reference propellant.

Descriptors :   *IMPACT TESTS, *INSENSITIVE EXPLOSIVES, PRESSURE GRADIENTS, PEAK VALUES, NETHERLANDS, COMPARISON, TERMINAL BALLISTICS, METAL PLATES, CALIBRATION, DUTCH LANGUAGE, DETONATIONS, GUN PROPELLANTS, GAS GUNS, SOLID ROCKET PROPELLANTS, CLOSED BOMB TESTS.

Subject Categories : Combustion and Ignition
      Ballistics

Distribution Statement : APPROVED FOR PUBLIC RELEASE