Numerical Simulation Of Low-density Jet Penetrated Into Shelled Explosive Without Denotated

The appear of ERA (explosive reactive armor) has brought the huge impact on thetraditional anti-armor ammunition, and promoted the development of the anti-armorammunition. At present, the tandem warhead is more mature and widely used as theanti-armor ammunition. However, a kind of low density nonmetallic liner is put forward. Itcan form low density shaped jet under the charge detonation, and penetrated armor, at thesame time not detonated the mezzanine explosive in ERA. Then the back main jet can directlypass through the hole without adopting the delay institution. So the structure of warhead ismore compacter. The low density liner forming a shaped jet by using the AUTODYN finiteelement program is simulated. And the analysis, that the low density jet penetrated the shelledexplosive, is carried out. Finally the contrastive analysis is done about the major influencefactors. The ERA is equivalent as shelled explosive.Research results showed that,(1) the thickness of liner δ is greater, the smaller theinitiating factor K=u2d, the smaller the probability that the mezzanine explosive in ERA isdetonated by low density jet.(2) The taper angle of liner θ is greater, the smaller the initiatingfactor K=u2d, the smaller the probability that the mezzanine explosive in ERA is detonated.(3)The charge height is greater, the bigger the initiating factor K=u2d, the easier the main chargein ERA is detonated by low density jet.(4) With the panel thickness of reactive armorincreasing, the critical initiation factor increases linearly more or less. the relation of theinitiating factor K and the panel thickness D1was received, that is, K=21.254+0.764xD1, themezzanine explosive4mm, rear panel2mm, D1is the panel thickness of shelled explosive,3mm≤D1≤7mm.(5) With the angle of penetration α increasing, the critical initiation factorroughly showed a trend of gradual decline. the relation of the initiating factor K and thepenetration angle α was received, that is, K=20.81-0.105α, the panel2mm, the mezzanine explosive4mm, the rear panel2mm,0°≤α≤50°.The research results can provide certain reference for the development of anti-armorammunition.