Research On Trajectory Deflexion Of Rigid Projectile Penetrating Concrete Based On Meso-model

It’s can be divided into the carter area, the tunnel area and the landslide area that the ballistic of projectile penetration concrete target, and the central line of the ballistic will be considered to perpendicular to the top surface of the target. However, on meso level considering, concrete will be seen as a multiphase composite material and the phase difference of the material mechanical properties. The projectile will be forced by the concrete in the process of the penetration the target, and the ballistic will change. In order to explore the factors of the ballistic changing and the law, rigid projectile penetrating meso-mechanical mode concrete is established.According the theory of plane motion of rigid body, the factors that influence trajectory are found by the penetrating process analysis, which contain aggregate strength, mortar strength, projectile penetration velocity, the randomness of aggregate, warhead shape, the ratio of the projectile’s diameter and the largest aggregate diameter and projectile body length to diameter ratio. The first three factors are defined of physical parameter, and the lists are four returned for geometrical parameters. In order to further explore the influence of various parameters on the ballistic deflexion of the rigid projectile penetrating concrete target, this paper analyzes the two types of parameters by single factor method, and the following conclusions are obtained:(1) Physical parameters1) According to the material characteristic of concrete, mortar and aggregate common of projectile penetrating provide axial resistance, and random inhomogeneous aggregate force and mortar resistance provides lead to the deflexion of the lateral force.2) Ballistic deflexion angle with mortar and concrete strength decreases and increases, instead, with the aggregate strength increases and increases. When the nominal compressive strength is low, deflect projectiles sensitivity to the change of the mortar intensity was significantly higher than that of aggregate strength changes.3) The trajectory is more stable with the penetration rate of the projectile, that is, the deflexion angle decreases with the increase of the target velocity.(2) Geometric parameters1) Random effect on the deflexion of the projectile is significant.2) The deflexion angle of the projectile with the CRH increases with increasing. When the CRH is larger than 4, the influence on the deflexion angle as result of the CRH increasing is not significant.3) The angle deflexion decreases with the ratio of the projectile’s body diameter to the largest aggregate diameter increasing, and the projectile doesn’t deflect almost when the ratio less than 2, which can use the homogeneous target instead..4) The deflexion angle is decrease with the ratio of body length to diameter increasing’ when the ratio is less than 7. However the projectile deflect hardly because of the ratio is greater than 7, which can use the homogeneous target instead too.