Been involved in penetration mechanics for over 30 years. Materials laboratory allows material characterization and deter. Ballistic Impact. Ballistic penetration and fragmentation of brittle targets Wed, 2017-09-27 08:07 - D.Rittel The attached, to appear in I.J. Impact Engng., is an attempt to simplify such very complex calculations using an incubation time concept for defects coalescence, in the spirit of Tuler and Butcher and others.

Abstract

An analytic method is proposed to estimate ballistic limits of ceramic-FRP composite armors. In this method the ballistic limit is evaluated using energy balance approach, that is, the kinetic energy of a projectile just before striking against the armor is assumed to be equal to the sum of energies absorbed during the penetration. The absorbed energies are divided into three parts as follows: the ones absorbed during the penetration into the ceramic facing and the FRP backing, respectively, and the elastic deformation energy of FRP backing. Through comparisons with Wilkins' experimental results this method is shown to be effective to estimate the ballistic limit of composite armors which consist of 4.064mm to 8.635mm thick AD85 ceramic plate and 4.445mm to 9.525mm thick glass FRP plate.

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Abstract

A model for the penetration of a ceramic target with the formation of an expanding conical hole is proposed that can be used to determine the apex angle of the cone knocked out from the target. The main cause of this fracture of ceramic targets is that the tensile strength of a ceramic material is much lower than its compressive strength. A method for calculating the maximum penetration velocity in a ceramic target without substrate was developed using the energy fracture criterion for ceramics. Two-dimensional numerical simulation of the impact of a steel projectile on a corundum plate showed satisfactory agreement between the calculated and experimental configurations of the resulting conical crack provided that the ratio between the compressive and tensile strengths corresponds to the recommendations of the developed model.

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