Effects of abrasion on the penetration of ogival-nosed projectiles into concrete targets

Abstract

This paper investigates the effects of abrasion on the penetration of an ogival-nosed projectile into concrete targets. A numerical procedure is constructed based on an abrasion model which is proposed based upon the experimental observations and a forcing function. The forcing function is a polynomial of the normal velocity which approximates the response of target and can be determined either empirically or theoretically or numerically. The proposed numerical procedure is easy to implement and can be used to calculate the time-histories of projectile velocity, penetration depth, deceleration, mass loss and its nose shape. It is found that the model predictions are in good agreement with available test data in terms of mass loss, penetration depth and nose shape change of the projectile.

Mass Loss and Penetration Depth of Hypervelocity Projectiles

“…Existing investigations confirmed that blunting and mass loss of projectiles weaken the penetration efficiency of projectiles [4,7,[13][14][15][16][17], provided that impact velocities are less than the critical velocities. In this subsection, we analyze the influences of blunting and mass loss at hypervelocities, aiming to figure out the dominant mechanism of the decrease in DOP.…”

Projectile Nose Mass Abrasion of High-Speed Penetration into Concrete

“…It is found the predictions of new model are in a good agreement with the observation of experiments. Wen et al [9] constructed an abrasion model which assumes that mass loss is a function of the relative strength of target and projectile materials, the damage number, and the hardness of aggregates. The abrasion model has a strong physical meaning.…”

Simulation of shape variation of projectile nose during high-speed penetration into concrete

“…16 As indicated by Ref. 13, the singularity usually occurs at the nose tip of projectile when the impact velocity is high. In order to overcome this singularity, we use the scale of space discretization to control the time step size, i.e., the time step is equal to the time for the first non-zero-y space discretization part of projectile totally melted from the outer surface of projectile to its axis.…”

“…Therefore, it is necessary to obtain the global or even local shape variation of projectile nose. Generally, the variation of projectile shape is simulated by numerical methods, such as finite element method (FEM), 8-10 finite difference method (FDM), [11][12][13] etc. However, the FEM model for shape variation of projectile usually demands insertion of algorithm of mass abrasion into certain commercial FEM software, [8][9][10] which is a much complicated procedure.…”

“…11 is too ambiguous and complicated to be implemented, and Wen et al confronted singularity in the projectile tip when the impact velocity was high. 13 In the present manuscript, based on Refs. 5 and 10, the frictional work is derived from the energy conservation law, and it is found proportional to the work done by pressure.…”