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.
Highlights
Some analytical or semi-analytical models have been developed to predict the penetration and perforation of targets struck normally by projectiles [3, 5, 12]
These analytical or semi-analytical models can be combined with FEA software to investigate the behaviour of a projectile in which the target response is represented by a forcing function as pressure boundary conditions [14]
Fracture of the head in the process of penetration as can be seen from the photographs that the projectile noses became irregular after penetrating concrete targets at high speeds, which cannot be described by the present finite difference procedure
Summary
Some analytical or semi-analytical models have been developed to predict the penetration and perforation of targets struck normally by projectiles [3, 5, 12] In these models, the target response is represented by a forcing function which applies to the projectile surface as pressure boundary conditions and could be determined using analytical or semi-empirical methods. Cavity expansion theory is used to derive the analytical forcing function equations [11, 12] in brittle or metallic targets and semi-empirical equations proposed by Wen [9, 10, 15, 16] are used for FRP laminates These analytical or semi-analytical models can be combined with FEA software to investigate the behaviour of a projectile in which the target response is represented by a forcing function as pressure boundary conditions [14]. Numerical results are compared with some available experimental data and the influences of various parameters discussed
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