In several theoretical analyses and semiempirical equations, the SSF is usually neglected or a 0.02–0.2 static friction coefficient is used directly to gain good agreement with the experimental data. This indicates that the sensitivity of SSF to the penetration process is one of the factors driving the two-phase feature.įorce analytical graph of projectile nose. Hence, it could be gained that the role exchange between the SSF and the dynamic term contributes to the two-phase penetration behavior for concrete-like materials. Simulation results show a similar conclusion to the analyses of the two-phase penetration process at the range below a certain critical striking velocity, adding friction can reproduce the experimental data when exceeding the critical striking velocity, the simulated results without considering friction are closest to the experimental data.
FORCE OF FRICTION LAB REPORT ASSISTANT PHYSICS 1401 SERIES
Furthermore, a series of numerical simulations are conducted to understand the role of SSF more clearly. Firstly, the penetration process according to the two-phase feature of the projectile deceleration is revised, where analytical results indicate that the SSF has a phased feature corresponding to the two-phase behavior of the deceleration history. This paper analytically and numerically focuses on the effect of SSF on the projectile deceleration characteristic of concrete-like targets. Currently, it appears that there is a lack of understanding related to the role of SSF, in the two-phase behavior of the deceleration history, which is an issue discussed recently in the impact dynamics field.