Showing papers in "International Journal of Impact Engineering in 2008"

TL;DR: In this article, a new damage criterion for RC column is defined based on the residual axial load-carrying capacity, and a numerical method to generate pressure-impulse diagrams for RC columns is proposed.

TL;DR: In this paper, an air blast simulation code was used to determine the blast loads at the front surfaces of the test panels, and these were used as inputs to finite element calculations of the dynamic response of the sandwich structure.

TL;DR: In this article, a range of metallic lattice structures have been manufactured using the selective laser melting (SLM) rapid manufacturing technique, and a series of blast tests were then undertaken on a ballistic pendulum in order to investigate the behavior of lattice structure under these extreme loading conditions.

TL;DR: In this article, an explicit finite element analysis (FEA) is used to derive higher-order response surfaces for the single, double, triple and quadruple cell sectional columns under longitudinal impact loading.

TL;DR: In this article, a large number of experiments have been conducted to investigate the structural response of sandwich panels loaded by blasts, and the experimental results are reported and discussed in this paper.

TL;DR: In this article, the authors presented the results from experiments and AUTODYN-3D® simulations on the ballistic impact of a KEVLAR® helmet against a 9 mm full-jacketed bullet traveling at 358 m/s.

TL;DR: In this article, a dynamic plastic damage model for concrete material has been employed to estimate responses of both an ordinary reinforced concrete slab and a high strength steel fibre concrete slab subjected to blast loading.

TL;DR: In this paper, a multilayered pyramidal lattice structure constructed from stainless steel was investigated and the lattice was fabricated by folding perforated 304 stainless steel sheets and bonding them to thin intervening sheets using a transient liquid-phase bonding technique.

TL;DR: In this article, the authors present CTH simulations of airbursts in the Earth's lower atmosphere from hypervelocity asteroid impacts, with the particular goal of determining whether the altitude of maximum energy deposition can be used as a reasonable estimate of the equivalent height of a point source explosion.

TL;DR: In this article, the ballistic response of laminated composite panels has been investigated through direct impacts of two non-deforming projectiles (7.5mm diameter hardened steel 120° cylindrical-conical, and 9mm hemispherical nosed) selected to enhance different failure mechanisms including penetration and delamination.

TL;DR: In this paper, a modified version of the Holmquist-Johnson-Cook (HJC) model for concrete under impact loading conditions is proposed, and the model parameters are obtained for two concrete qualities, and perforation of concrete slabs is considered numerically and compared with experimental results from the literature.

TL;DR: In this article, the response and failure of sandwich beams with aluminum-foam core are investigated, and the failure modes and crash processes of beams under impact loading are similar to those under quasi-static loading, but the force displacement history is very different.

TL;DR: In this article, the authors investigated the ballistic performance of different fabric ply numbers used in body armours and showed that the fabric ply number and stitching type have significant effects on ballistic properties and the effect of conditioning is limited.

TL;DR: In this article, full-scale field explosion tests on protected and unprotected concrete slabs were performed by the Protective Technologies Research & Development Center of the Faculty of Engineering Sciences of the Ben-Gurion University of the Negev (BGU-PTRD).

TL;DR: In this article, a testing device for the experimental study of dynamic compaction of concrete under high strain rates is presented for the same material under quasi-static loadings, which is validated by several numerical simulations of tests involving a set of four different concrete-like behaviours and different friction coefficients between the cell and the specimen.

TL;DR: In this article, the impact behavior of an artificial bird impinging a flexible aeroengine fan blade was analyzed using the LS-DYNA simulation model and the results showed that the initial contact area between the bird and target in the early phase of the impact event would have a significant effect on the peak impact force.

TL;DR: In this article, the response of structural concrete prisms to high rates of uniaxial tensile loading was investigated using a finite-element (FE) program capable of carrying out 3D nonlinear static and dynamic analyses.

TL;DR: In this article, the deformation behavior of layered aluminum plates of different thicknesses under the impact of flat, ogive and hemispherical nosed steel projectiles was investigated using finite element code ABAQUS.

TL;DR: In this paper, the parameters describing macroscopic stress wave propagation are analyzed in direct simulations of the discontinuous composite of aggregate, mortar and pores. And the results are compared to available literature sources.

TL;DR: Theoretical and numerical methods for deriving pressure-impulse diagrams for structural elements subjected to transient loads are described in this paper, and the application of these approaches to the behavior assessment of tested structural elements is illustrated.

TL;DR: In this paper, a pseudo-analytical formulae based on numerical results are derived to estimate the reflected pressure-time history on a rigid wall behind a protective barrier, which can be used with those given in TM5-1300 or other methods for blast pressure estimation in the no-barrier case.

TL;DR: In this paper, the power-law character unique to brittle solids is contrasted to fragment distributions of other materials, and ideas that emerge from the physical similarities suggest methods for extending an earlier energy-based theory of dynamic fragmentation.

TL;DR: In this paper, both instrumented drop-weight tests and compression-after-impact tests were carried out to examine and compare the damage responses of stitched and unstitched graphite/epoxy laminates subjected to low-velocity impact.

TL;DR: In this paper, cylinders and rings fabricated from AerMet ® 100 alloy and AISI 1018 steel have been explosively driven to fragmentation in order to determine the fracture strains for these materials under plane-strain and uniaxial-stress conditions.

TL;DR: Finite element simulations have been performed for the impact onto steel anvils of solid rods of a pressed composite mixture of polytetrafluoroethylene (PTFE) and aluminum powders.

TL;DR: In this article, the ballistic resistance of double-layered steel shields against projectile impact at the sub-ordnance velocity is evaluated using finite element simulations, where four types of projectiles of different weight and nose shapes are considered, while armor shields consist of two layers of different materials.

TL;DR: In this article, a method for obtaining materials parameters, for quartz sand, over a wide range of strain rates, involves the use of a modified Kolsky bar and plate impact experiments.

TL;DR: In this article, a multi-level approach is proposed to predict the dynamic structural response in the case of low-velocity/low-energy impact on metal-skinned sandwich structures.

TL;DR: In this paper, a crashworthiness optimization procedure has been applied to maximize specific energy absorption of the square beams with the target energy absorption, and a comprehensive study about the strengthening effect of foam in the filled beam has been performed and finally the optimization technique has been implemented to find the optimum foam-filled beam that absorbs the same energy as optimum empty tubes with lower weight.

TL;DR: In this article, the quasi-static and rate-dependent mechanical properties of aramid yarns are presented together with a study on different methods of securing yarn specimens in tensile tests.