Abstract: A cast CL-20-based explosive, named GWL, with the ratio of 84% CL-20,11% HTPB and 5% Al-Zn alloy powder was prepared to study the metal accelerating characteristics of castable Cl-20-based composite explosive. The density, detonation speed, detonation pressure, mechanical sensitivity, and three insensitivity characteristics , including fast firing, slow firing and bullet impact of GWL, were tested. The results show that the density of GWL is 1.78 g/cm³, the detonation velocity is 8 750 m/s, the detonation pressure is 33.21 GPa, the reaction level of insensitivity test is combustion, and the mechanical sensitivity also meets the requirements of explosives. The accelerating ability of GWL explosive specimen was tested by a 50 mm standard cylinder test. The test results show that the expension speed of GWL explosive specimen driving the cylinder at 41 mm characteristic point is 1 730 m/s. The cylinder test process is numerically simulated and calculated using the finite element analysis software Autodyn. The JWL equation of state of GWL explosive was obtained by comparing the test results with the numerically simulated results. A control group named GC with the ratio of 89% CL-20 and 11% HTPB was prepared. The mechanical sensitivity and explosive driving ability of GC were tested under the same experimental conditions. The results show that the accelerating abilities of GC and GWL are the same, but the mechanical sensitivity of GC is higher than that of GWL. At last, the accelerating abilities of GWL, C-1 and LX-14 explosives are studied by using AUTODYN software. The results show that the final velocity of GWL is 2.6% higher than that of LX-14. It is a new type of CL-20 based cast explosive with high energy and low sensitivity.

Key words: plasticbondedexplosive, CL-20, explosiveinsensitivity, cylindertest