Abstract
Penetration into stone concrete is an important research area of concrete penetration, and related experiments and simulation tests have been carried out. However, complete theories have not been formed yet. This paper develops a differential facet resistance model for penetration into stone concrete target. Firstly, the plastic damage model is used to analyze the penetration of concrete target, and the reliability of the numerical model is verified by comparing with the classical experimental results. Besides, the numerical model of stone concrete is established based on 3D Voronoi diagram according to the random characteristics of the shape and spatial distribution of stones in concrete. Then, simulation tests are carried out with the validated numerical model, a differential facet resistance model suitable for the penetration of stone concrete target is then proposed referring to the resistance formula of Forrestal and Rosenberg. At last, a method for fast calculation of penetration into stone concrete is introduced.
Highlights
Wang et al [5] pointed out that penetration resistance of rock-like media was expected to be expressed as a function of velocity at lower velocity and gave analytical expressions of differential facet stresses in different velocity intervals
The calculation efficiency is improved on the basis of ensuring the accuracy as far as possible. e significance of establishing the differential facet stress model is that a general approximate solution can be obtained without considering the influence of the shape of warhead and different stages of penetration
(3) In the lower speed range, the static resistance term of the projectile in the penetration process should not be regarded as a constant. ere is a logarithm relationship between the static resistance term and velocity, the coefficient of which is related to strength of the target
Summary
As a common building material, concrete is widely used in various military facilities, such as bunkers, plane holes, and missile silos. e research of concrete penetration has a long history, in which the resistance model of projectile is an important content. e most widely used theory currently is the dynamic cavity expansion theory and its application range has been extended to rocks and soils other than metals and concrete with the diversification of target media [1]. e dynamic cavity expansion theory holds that the resistance of the projectile consists of two terms including quasi-static resistance term (the strength term) and dynamic resistance term (the inertial term). e intensity term is determined by the strength of the target and the inertial term depends on velocity of the projectile and density of the target. e strength term is dominant at lower speed, while the inertia term is dominant at higher speed. E most widely used theory currently is the dynamic cavity expansion theory and its application range has been extended to rocks and soils other than metals and concrete with the diversification of target media [1]. E dynamic cavity expansion theory holds that the resistance of the projectile consists of two terms including quasi-static resistance term (the strength term) and dynamic resistance term (the inertial term). Based on the cavity expansion theory, Forrestal et al [2] proposed a semianalytical expression of the total axial resistance of ogive nosed projectile penetrating semi-infinite thick concrete and differentiated the forces in the pit area and the tunnel area. Rosenberg and Dekel [4] believed that resistance of penetrating concrete only included constant term under rigid projectile hypothesis. Wang et al [5] pointed out that penetration resistance of rock-like media was expected to be expressed as a function of velocity at lower velocity and gave analytical expressions of differential facet stresses in different velocity intervals
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