Showing papers in "International Journal of Impact Engineering in 1997"

TL;DR: In this article, the plasticity concrete material model in the Lagrangian finite element code DYNA3D was assessed and enhanced, and the main modifications include the implementation of a third independent yield failure surface, removal of the tensile cutoff, and extension of the model in tension.

TL;DR: In this paper, a simple shock model based upon a rate-independent, rigid, perfectly-plastic, locking (r-p-p l) idealisation of the stress-strain curves for wood is proposed to provide a first order understanding of the dynamic response.

TL;DR: In this paper, experimental results for six types of honeycomb cellular structures under quasi-static and impact loads applied in the axial direction are reported, and an increase of up to 74% of the crush strength was observed when the specimens which were loaded dynamically were compared with those loaded under the quasistatic conditions and the increase was found to be proportional to the initial striking velocity of the projectile.

TL;DR: In this paper, an experimental study was conducted on the static and dynamic axial crushing of 128 thin-walled mild steel columns which buckled mostly in the plastic range. But the results showed that even relatively short columns buckled in the global inelastic buckling mode, while a transition to progressive plastic buckling is observed later in the collapse process.

TL;DR: In this paper, a statistical model of a tensile strength is implemented into the SALE-2D hydrocode for estimating general features of the atmospheric breakup of meteoroids and fracturing around impact craters.

TL;DR: In this paper, a detailed study of the technical problems of such a viscoelastic setup related to the measurement and to the loading conditions is offered on the basis of the three-dimensional (3D) Fourier stationary harmonic wave analysis.

TL;DR: In this paper, an experimental study of the normal and oblique impact of armour-piercing projectiles on single and layered plates of mild steel, RHA steel and aluminium is presented.

TL;DR: In this article, four improvements to Smoothed Particle Hydrodynamics which enhance its ability to simulate hypervelocity impact are discussed and applied to the impact fracture of a steel cube on an aluminum plate at 22 km/s.

TL;DR: In this paper, an SPH capability implemented into the AUTODYN-2D software has been used to simulate hypervelocity impacts on thin Whipple shield type target plates.

TL;DR: In this article, the authors performed 40 terminal ballistics experiments to measure the penetration of simple confined boron carbide targets by long tungsten rods by using a two-stage light-gas gun.

TL;DR: In this paper, a two-stage model incorporating a first stage penetration algorithm into an infinite medium and a second stage of punching shear is presented to predict the penetration and perforation of concrete slabs impacted by low velocity missiles.

TL;DR: In this article, a dynamic tensile testing technique for polyethylene fiber reinforced composites is described, and a full numerical simulation is performed in Autodyn-2D to elucidate what is happening during the experiment.

TL;DR: In this article, an experimental investigation has been performed to investigate the ballistic performance of ceramic tiles as a function of the extent of confinement and impact velocities, and conclusions are made concerning ceramic tile performance.

TL;DR: In this article, a closed form solution to the problem of steady-state wedge cutting through a ductile metal plate is presented, which is an idealization of a ship bottom raking process.

TL;DR: A theoretical analysis of the observed stable collapse mechanism of thin-walled circular frusta and tubes, crushed under axial static and/or dynamic loading, for calculating crushing loads and the energy absorbed during collapse, is reported in this paper.

TL;DR: In this article, a gridless particle code SOPHIA running the Smooth Particle Hydrodynamics (SPH) model is presented, where state variables are calculated at grid independent interpolation points (particles).

TL;DR: The ALEGRA as mentioned in this paper is a multi-material, arbitrary-Lagrangian-Eulerian (ALE) code for solid dynamics being developed by the Computational Physics Research and Development Department at Sandia National Laboratories.

TL;DR: In this paper, the authors measured ion yields and their characteristic energies in the plasma produced by hypervelocity impacts of iron rrmicroparticles on rhodium in the range 1.2 to 87 km s'.

TL;DR: In this article, an empirical relationship has been established to describe the fracture rate as a function of the tensile stress, ultimate tensile stresses that has activated a damage in the point, the damage value, and the temperature.

TL;DR: In this paper, a structural constitutive model was used to predict the penetration process for short and long projectiles, and the area of the target that becomes delaminated during impact was shown to increase when the impact velocity was increased until the ballistic limit.

TL;DR: In this paper, a simple pair of ordinary differential equations describing a one-dimensional model of a deforming Taylor impact specimen were numerically integrated, and the Johnson-Cook strength model was assumed to apply and was used to estimate material strengths and plastic wave speeds during the deformation process.

TL;DR: In this paper, the performance of alumina/5083 aluminium and steel armours when subjected to oblique impact by 7.62 mm Swedish FFV Armour Piercing and U.K. Ball ammunition was investigated.

TL;DR: In this article, a spherical metal sample is subjected to controlled impulsive stress loads by acceleration to a high velocity in a light-gas launcher with subsequent normal impact onto a thin plate.

TL;DR: In this paper, the performance of a 0.95 weight per cent carbon tool steel against 7.62 mm ball and armour piercing bullets was investigated in the unwelded and welded condition.

TL;DR: In this article, the authors conducted three penetration experiments of a hardened 4340 steel projectile with a length-to-diameter ratio of 7 into concrete targets having an unconfined compressive strength of 43 MPa.

TL;DR: In this paper, an irrotational isochoric velocity field is considered that consists of three parts, each of which together satisfy the condition of impenetrability at the projectile's surface.

TL;DR: In this paper, an experimental investigation has been conducted to study the perforation characteristics in the axial direction of cellular sandwich plates, as well as of its individual components, using hard-steel strikers of two sizes, of spherical, cylindro-conical or cylindrical shape.

TL;DR: A series of terminal ballistic tests with 7.62 mm APM2 projectiles was performed in order to correlate the resistance to penetration of differently-treated Ti6Al4V plates with their dynamic properties as discussed by the authors.

TL;DR: In this paper, the authors developed a number of penetration equations for a broad range of thermal protection system (TPS) materials used on the Space Shuttle Orbiter and other spacecraft including low-density ceramic tiles, reinforced carbon-carbon, flexible ceramic insulation and multi-layer insulation (MLI).

TL;DR: In this article, the results from reverse ballistic tests can be used to estimate the length of rod erosion in the ceramic tiles of depth-of-penetration (DOP) tests, which can then be predicted by using recently published data bases on RHA penetration to determine the residual penetration into the steel back-up of the DOP test.