Experimental study on over-loading of strong flash pyrotechnic composite

Over-loading of strong flash pyrotechnic composite was studied by using drop hammer simulation device. The experimental results show that strong flash pyrotechnic composite has high over-loading ability. When charges density was 1.9 × 10³ kg·m^-3, loading stress was 653 MPa, loading length was 40 mm, loading of strong flash pyrotechnic composite was 8.59 × 10⁵ g (g = 10 m·s^-2). When loading stress was more than 653 MPa, the hotspots produced by strong over-loading couldn't ignite strong flash pyrotechnic composite. The reasons that strong flash pyrotechnic composite has high overloading ability are (1) thermal decomposition temperature of oxidant and ignition temperature of combustible are very high in pyrotechnic composite, the pyrotechnic reaction cannot be induced by hotspots; (2) charge flaws of pressed flash pyrotechnic composite are better improved and hotspot generation source is reduced. (3) the contact areas between KClO₄ and Al are increased when strong flash pyrotechnic composite is extruded into pillar, so heat produced by hotspot generation source can rapidly be transmitted through metal particle, furthermore, hotspot is extinguished.