Showing papers in "International Journal of Impact Engineering in 2011"

TL;DR: In this paper, a meso-scale model for concrete, called the Confinement Shear Lattice (CSL) model, is extended in order to include the effect of loading rate on concrete strength and fracturing behavior.

TL;DR: In this article, a full 3D finite element model of impact on thick-section composites is developed, which includes initiation and progressive damage of the composite during impact and penetration over a wide range of impact velocities.

TL;DR: In this paper, a micro-mechanism model is developed to demonstrate that microcrack inertia is one of the mechanisms responsible for the increase of dynamic tensile strength with strain-rate observed in the dynamic testing on concrete-like materials.

TL;DR: In this paper, the authors describe improvements to the ǫ-α porous compaction model for simulating solar system impacts and demonstrate good agreement between numerically computed Hugoniot curves for porous iron (up to initial porosities of ∼80%).

TL;DR: In this article, a numerical analysis of the ballistic performance of monolithic, double-and triple-layered metallic plates made of either steel or aluminium or a combination of these materials, impacted by a 7.62mm APM2 projectile in the velocity range of 775-950m/s.

TL;DR: In this article, the authors deal with the numerical simulation of low-velocity impact tests on glass fabric/epoxy laminates through the LS-DYNA Finite Element (FE) code.

TL;DR: In this paper, a failure criterion for laminated glass in case of impact is presented, where a critical energy threshold must be reached over a finite region before failure can occur, and then crack initiation and growth is based on a local Rankine (maximum stress) criterion.

TL;DR: In this article, a combined experimental-numerical approach for extraction of the strain rate and temperature dependent mechanical behavior from high strain rate experiments is presented, which involves the identification of the material model parameters used for the finite element simulations.

TL;DR: In this article, a split Hopkinson tension bar (SHTB) was modified to conduct dynamic tensile experiments on pig skin to investigate the tensile stress-strain response at both quasi-static and dynamic rates of deformation.

TL;DR: In this article, small scale explosive loading of sandwich panels with low relative density pyramidal lattice cores has been used to study the large scale bending and fracture response of a model sandwich panel system in which the core has little stretch resistance.

TL;DR: In this article, numerical simulations are performed to construct the pressure-impulse diagrams for FRP strengthened RC columns to provide correlations between the damage levels of FRP-stressed RC columns and blast loadings.

TL;DR: A mesoscale concrete model consisting of cement mortar, aggregates and interfacial transition zone (ITZ) is developed to simulate direct tensile tests and to study the influences of the lateral inertia confinement and heterogeneity on tensile strength increment of concrete materials with respect to strain rates as discussed by the authors.

TL;DR: In this article, the failure modes and energy absorption capabilities of different kinds of circular tubes made of carbon, Kevlar, and carbon-Kevlar hybrid fibers composites with epoxy resin have been evaluated.

TL;DR: In this paper, a high-fidelity physics based computer program, LS-DYNA, is utilized to provide numerical simulations of the dynamic response and residual axial capacity of reinforced concrete (RC) columns subjected to blast loads.

TL;DR: In this paper, a planar stripline configuration of aluminum and copper flyer plates is proposed to increase the magnetic pressure for a given current and the cross sectional area of a flyer plate is larger than in previous coaxial loads.

TL;DR: In this article, the critical oblique angle at which the penetration process changes from perforation to embedment or ricochet was studied both experimentally and numerically, and the results showed that the critical angle was less than 60° for both bullet types.

TL;DR: A semi-Lagrangian reproducing kernel particle method (RKPM) is proposed for fragment-impact modeling to alleviate mesh distortion difficulties associated with the Lagrangian FEM and to minimize the convective transport effect in the Eulerian or Arbitrarylagrangian Eulerians FEM.

TL;DR: In this article, numerical simulation of the explosive welding which involves multi-physical phenomenon is performed by using material point method (MPM) not only can major physical phenomena of explosion impact be well captured, but also some important technical parameters for the exploding welding can be attained based on the MPM simulation through the comparison with the experimental results.

TL;DR: In this paper, a numerical finite element convergence study of the discretisation sensitivity for the gas dynamics has been performed, with use of mapping results from 2D to 3D in an Eulerian reference frame.

TL;DR: In this paper, a miniaturized tensile Kolsky bar was used to determine the tensile response of PPTA single fibers at a high strain rate, and it was found that initial transverse compression on the fibers reduces their ultimate tensile strength.

TL;DR: In this paper, the dynamic three-point bending behavior of double cylindrical tubes filled with closed-cell aluminum foam core was studied experimentally and numerically, and it was found that the deformation mode of this new structure under impact loading is different to that under quasi-static loading.

TL;DR: A comprehensive review of the literature related to mine blast is provided in this article, where a series of mine blast loading experiments are described where the soil moisture content, plate standoff, and plate shape (flat and V-shaped) were varied.

TL;DR: In this paper, a set of dynamic compression impact experiments on PVB specimens using SHPB (Split Hopkinson Pressure Bar) method are conducted at strain rates from 700/s to 4500/s.

TL;DR: In this paper, the effect of variation in thickness of tile and the projectile velocity on the ballistic efficiency of the material was studied and it was found that the differential efficiency factor (DEF) increases with increase in projectile velocity from 600 to 820 m/s.

TL;DR: In this article, the residual stresses in laser shock peened (LSP) Inconel 718 Ni-base superalloy and their thermal relaxation behavior were investigated based on three-dimensional nonlinear finite element analysis.

TL;DR: In this article, a technique based on the Split Hopkinson Pressure Bars system was proposed to carry out a triaxial compression test, where a cylindrical specimen is placed into a confining ring and is compressed by the system of bars.

TL;DR: In this article, a methodology has been developed to design composite personnel armor by optimizing the role each layer plays during projectile defeat, which consists of a very hard 1st layer to deform and fracture the projectile, an orthotropic 2nd layer to slow down the shock wave propagation in the through thickness direction, whilst allowing rapid propagation in transverse directions, a 3rd porous layer to absorb the shock ray energy through PV-work, and a 4th layer to provide confinement for the porous medium.

TL;DR: In this article, a 3D finite-element study of reinforced concrete beams with different amount of shear reinforcement under impact is presented. But the impact was modeled not by explicit modeling of two bodies but by incrementing the load point displacement till the maximum value and at the rate reported from the test.

TL;DR: In this article, the effect of heat treatment on mechanical properties and ballistic resistance of AA 7055 aluminum alloy plates has been studied and the impact of these heat treated plates of thicknesses 5 and 10 mm are evaluated by impacting deformable projectiles at a velocity of 820 ± 10 m/s and at a normal angle of attack, by using a thick backing technique.

TL;DR: In this paper, the authors present numerical simulations of dynamic responses of a ship section to noncontact underwater explosion using ABAQUS, and compare the acceleration and velocity response between the experimental and numerical results.