Reaction characteristic for various scale explosive under mild impact
This work presents a varying trend of impact ignition threshold which denoted by minimum impact velocity to trigger an ignition when the scale of explosive changes.The effects of explosive scale factors on impact induced reaction degree were investigated by Steven tests and numerical simulation for PBX-C03 (an HMX based explosive) impacted by projectiles of various velocities.Two scale factors i.e.axial thickness and radius were studied through various scales samples including Φ98 mm× 13 mm, Φ98 mm×39 mm, Φ140 mm× 13 mm and Φ140 mm×39 mm.The velocities of projectiles, the impact and ignition processes were analyzed by high speed camera.The pressure histories were measured by embedded manganin pressure gauges and PVDF stress gauges.The reaction overpressures of explosive were obtained by blast pressure gauges to evaluate the reaction degree.Effects of explosive scale factor on reaction degree and characteristic under mild impact were summarized: in a certain range (larger than the diameter of impact projectile), different diameters of samples do not influence the velocity threshold, but the thickness of the samples does namely, the velocity threshold increases with the thickness of the sample.These studies also indicate that the ignition and explosion in Steven tests are mainly triggered by the overlapping of direct impact and reflected stress wave.Our numerical simulations results of pressure and ignition times are consistent with the experimental data.The obtained knowledge can be used to evaluate the safety of different scale HMX based explosives under accidental impact or fails.
Steven Test Explosive Scale Impact Velocity Threshold Numerical Simulation
WEN Yushi DAI Xiaogan HAN Yong XIANG Yong
Institute of Chemical Materials,CAEP,Mianyang 621900,Sichuan,China
国际会议
成都
英文
212-219
2013-09-24（万方平台首次上网日期，不代表论文的发表时间）