Performance of a flying cross bar to incapacitate a long-rod penetrator based on a finite element model

Effects of Impact Location and Angle of a Flying Cross Bar on the Protection of a Long-Rod Penetrator

“…Despite this limitation, the current numerical results may be used to examine the sensitivity of performance to design parameters, and in general, the trends, rather than absolute values, will probably be correct. The validity of adopting no fracture models together with the employed equivalent plastic strain limit (1.5) was checked in the previous work [12]. However, in the current work, the depth of penetration by the deformed penetrator after the interaction with the cross bar has a meaning on a comparative basis only between the simulation cases because of the lack of the tensile fracture mode of the penetrator.…”

“…Velocity of bar (in m/sec unit), V b , at a given condition of KE b /KE p = 1/8 is shown in Table 2. Note that specifying the value of KEb/KEp is somewhat arbitrary because a higher KE b /KE p value will yield higher protection performance [12].…”

“…The Johnson-Cook (JC) flow stress model [15] and the polynomial equation of state (EOS) were employed. The model formulation and parameters in the JC model and the polynomial EOS were shown in previous work [12].…”

“…Its feasibility to incapacitate the incoming long-rod penetrator was reported in [11]. In our previous work [12], the influence of some fundamental parameters such as the diameter and kinetic energy (velocity) of the bar on the performance of penetrator protection was numerically investigated under a limited condition where the impact takes place between the center of the penetrator and the center of the bar at a fixed impact obliquity of 45 • . However, such scenario would be rare in a practical situation.…”

Minimum Required Distance of Strain Gauge from Specimen for Measuring Transmitted Signal in Split Hopkinson Pressure Bar Test

“…A strain rate-dependent constitutive equation [1,2] is indispensable for the modelling and simulation-based design of solids and structures exposed to high strain rate events [3][4][5][6] such as crashes in high-speed transportation systems (airplanes, express trains, and automobiles), high-speed machining, blasting of rock and buildings, impact, penetration, and explosion. Stress-strain curves measured under the uniaxial stress condition at a wide range of strain rates are required for the calibration of a strain-rate-dependent constitutive equation.…”