Experimental, numerical and analytical study of energy absorption in high velocity penetration phenomena on composite targets

چکیده مقاله

One of the most important, most accurate and the best of views to projectile impact and penetration phenomena in the composite target is the models related to energy discussion. In this paper previous works have been studied and it has been tried to verify and complete them. In the experimental study for the accuracy of model a reservoir of glass/epoxy is done under projectile impact and penetration of spherical pellets at different speeds. This model can investigate the ability or inability of projectile exit from the target and predict the remaining energy during passing through the target, by comparison the total energy of projectile with energy absorption mechanism, Also it is estimated the contribution of each mechanism to absorb energy at different speeds by this model. As well as ballistic velocity of projectile is estimated when it impacts to a composite target with good accuracy. This model has considered the most mechanism of energy absorption and it has been tried to add new mechanism of energy absorption; includes energy absorbed from the shift of the top cone under the projectile, energy absorbed by deformation of elastic – plastic primary fiber and energy absorbed from the friction make between the projectile and composite targets; and expresses the best and most accurate model of energy absorption. Finally, the results of this model have been compared with the results of FEM performed by ANSYS module LS.DYNA.