Influence of thermal effects on the process of high-velocity penetration of a fluoro-polymer plate

We examine the problem of high-velocity impact of a steel cylinder on a fluoro-polymer plate. The finite-element numerical method is used to study the distributions of thermal and mechanical variables which result from the process of this axisymmetric interaction. The features of plate penetration are revealed when the temperature in some regions of the fluoro-polymer exceed melt, and thermal dissociation takes place.Institute of Structural Macrokinetics, Tomsk Branch, Russian Academy of Sciences, Tomsk. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 62, No. 4, pp. 564–568, April, 1992.     

Mathematical simulation of fracture of ceramic obstacles in axially symmetric high-velocity impact

Calculations were made by the finite element method of the high-velocity interaction of cylindrical steel strikers with ceramic obstacles in the range of impact velocities up to 1500 m/sec. A kinetic model of active type fracture was used for numerical simulation of fracture of the ceramic. Chronograms of the process and distribution of the isolines of specific volume of cracks at different moments of time are given. Features of penetration of ceramic obstacles with different initial impact velocities are described.Translated from Problemy Prochnosti, Nos. 5–6, pp. 87–94, May–June, 1995.     

A numerical study on the collision of a filled projectile with a strong obstacle

Unsymmetrical interaction is considered between a shaped cylinder containing a powdered ceramic and a planar undeformable obstacle. An elastoplastic model is used with a finite-element method to derive the deformation in the projectile with and without the filler. Chronograms and graphs are given to characterize the dynamic and kinematic parameters.Translated from Problemy Prochnosti, No. 1, pp. 47–50, January, 1992.     

Computer Simulation of Normal and Oblique Impacts of Yawed Projectiles on Ceramic Targets

The investigation of a three-dimensional problem of normal and oblique interaction of yawed projectiles with ceramic plates in the velocity range up to 4000 m/s was carried out by the finite-element method. The paper presents an advanced constitutive model of AD995 Alumina. The model of a damaged medium is used; it is characterized by a possibility of crack initiation and propagation under impact loading. A kinetic fracture model of active type developed earlier for the simulation of fracture in various materials is used for numerical modeling of failure of ceramics at high velocity impact. Temperature effects are taken into account in the constitutive model.     

Failure and relaxation effects in plates in synchronous contact of two bodies with them

The results of numerical investigation of the synchronous interaction of two particles with a plate in high-velocity impact are presented. The calculations were made with use of the finite element method and damages of the material were simulated with use of a kinetic model of failure.Translated from Problemy Prochnosti, No. 7, pp. 51–55, July, 1992.     

Fracture kinetics and relaxation phenomena in a composite plate under transient loads

The interaction between a cylindrical steel particle and a plate made of asbestos-fabric textolite and aluminum, is investigated numerically by using the method of finite elements. The kinetic fracture model is used in calculations. The fracture kinetics in a two-layer plate and the causes of the failure observed are analyzed.Translated from Problemy Prochnosti, No. 8, pp. 48–51, August, 1992.