Abstract
Perforation behavior of 3 mm/3 mm double-spaced aluminum plates by PTFE/Al/W (Polytetrafluoroethylene/Aluminum/Tungsten) reactive projectiles with densities ranging from 2.27 to 7.80 g/cm3 was studied experimentally and theoretically. Ballistic experiments show that the failure mode of the front plate transforms from petalling failure to plugging failure as projectile density increases. Theoretical prediction of the critical velocities for the reactive projectiles perforating the double-spaced plates is proposed, which is consistent with the experimental results and well represents the perforation performance of the projectiles. Dimensionless formulae for estimating the perforation diameter and deflection height of the front plates are obtained through dimensional analysis, indicating material density and strength are dominant factors to determine the perforation size. High-speed video sequences of the perforation process demonstrate that high-density reactive projectiles make greater damage to the rear plates because of the generation of projectile debris streams. Specifically, the maximum spray angle of the debris streams and the crater number in the debris concentration area of the rear plate both increase with the projectile density and initial velocity.
Highlights
Reactive projectiles incorporate the strength and energy advantages of novel reactive materials
The main conclusions drawn from the analysis are as Experiments and theoretical analysis were conducted to study the perforation behavior of double-spaced thin aluminum plates by PTFE/Al/W reactive projectiles of densities ranging from 2.27 to 7.80 g/cm3
The main conclusions drawn from the analysis are as follows: (1) Critical perforation velocities for reactive projectiles perforating the double-spaced plates were obtained
Summary
Reactive projectiles incorporate the strength and energy advantages of novel reactive materials. Reactive materials have been extensively studied, and a series of potential engineering applications have been obtained due to their unique characteristics. A specific class of reactive materials is active metal particle filled polymer-matrix composites, such as PTFE/Al (Polytetrafluoroethylene/Aluminum), PTFE/Ti (Polytetrafluoroethylene/Titanium), etc. Based on the basic composition, high density metal particles, such as tungsten powders are often introduced to improve the density and mechanical strength of reactive materials. The relating research includes mechanical properties [4,5,6,7], impact response [8,9,10], and energy release characteristics [11,12] of the reactive materials
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