Detonation Diameter Effect of CL-20-based Pressed Explosives
The detonation propagation characteristics of hexanitrohexaazaisowurtzitane(CL-20)-based pressed explosives are studied to promote the application of CL-20 mixed explosives in micro-detonation sequences.For a typical pressed CL-20 mixed explosive(C-1,CL-20/binder=95/5),the reaction rate equation parameters of Lee-Tarver shock initiation model for this explosive are calibrated through the shock initiation experiments,providing the model parameters for simulation studies of diameter effect.Based on this,the detonation diameter effect of cylindrical step charges is verified through numerical simulation and experiment,and the relationship between charge diameter and detonation velocity is established.The detonation diameter effects of C-1,PBX9404 and PBX9502 explosives are compared through the numerical simulation of conical charge detonation propagation.The critical diameters of the three explosives are obtained by fitting the relationship between detonation velocity and charge diameter,and the influence rules of different constraint conditions on the critical detonation diameter of C-1 explosive are mastered.The study shows that the critical detonation diameter of C-1 explosive(1.34 mm)is between those of PBX9404(1.27 mm)and PBX9502(2.3 mm).This is because the detonation velocity decay caused by the detonation diameter effect of explosive is related to its shock initiation characteristics,and the different stages of detonation velocity decay are controlled by different reaction rate terms(ignition,low-pressure slow reaction,and high-pressure fast reaction).In addition,with the strengthening of constraint conditions,the critical diameter of C-l explosive decreases.the influence of lateral rarefaction wave can be greatly weakened by using radial full constraint,and its critical diameter is decreased by 51.5％compared with that of unconstrained charge.
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