Showing papers in "International Journal of Impact Engineering in 2009"

TL;DR: In this paper, the perforation resistance of five different high-strength steels has been determined and compared against each other, including Weldox 500E, Weldox 700E, Hardox 400, Domex Protect 500 and Armox 560T.

TL;DR: Zhang et al. as discussed by the authors employed numerical simulation to further demonstrate that the unexpected radial confinement in an SHPB test is responsible for the increase of the dynamic compressive strength of concrete-like materials at strain-rates from 10 1 to 10 3 ǫs −1.

TL;DR: In this article, the authors present a comprehensive evaluation study of several widely used concrete material models, including LS-DYNA, RHT, and AUTODYN, to evaluate their actual performances under various loading conditions.

TL;DR: In this article, the in-plane dynamic crushing of 2D hexagonal-cell honeycombs has been simulated using finite elements to explore the dynamic response of cellular materials and to investigate the features of the crushing front and to examine the assumptions employed in a one-dimensional shock theory.

TL;DR: In this article, the material point method is applied to the simulation of hypervelocity impact problems, and a three-dimensional MPM computer code, MPM3D, is developed.

TL;DR: In this article, a series of indentation tests have been carried out quasi-statically on various configurations of stiffened panels and the performance of two failure criteria, referred to as the BWH instability criterion and the RTCL damage criterion, were investigated.

TL;DR: In this article, the compressive stress-strain behavior of expanded polypropylene foams has been investigated over a wide range of engineering strain rates from 0.01 to 1500 s −1 in order to demonstrate the effects of foam density and strain rate on the initial collapse stress and the hardening modulus in the post-yield plateau region.

TL;DR: In this article, the effect of a compressive preload on the low velocity impact behavior of three different carbon fiber-reinforced plastic (CFRP) materials is investigated, and numerical simulation methods for this impact scenario using the commercial explicit finite element code LS-DYNA is described in detail.

TL;DR: In this article, a high-speed stereo-vision system was employed to quantify dynamic material response during buried blast loading, and deformation measurements obtained using 3D image correlation of synchronized, patterned stereo vision images obtained with an inter-frame time in the range 16μs to 40μs.

TL;DR: In this paper, a modified split Hopkinson pressure bar (SHPB) system was used to measure the strain rate sensitivity of polyurea using an advanced wave deconvolution method.

TL;DR: In this article, the effect of paper honeycomb structure factors on the impact behavior was analyzed, and the results can be used to optimize the structure design and material selection for packaging design.

TL;DR: In this paper, a ship is assumed to settle vertically on a rock and contact actions are local and restricted to one plate section, and various configurations of stiffened panels are loaded laterally by a cone shaped indenter until fracture occurs.

TL;DR: In this article, an experimental design of direct planar impact experiments with longitudinal and transverse strain gauges is analyzed in predictive hydrocode simulations using an elastic-plastic damage model for concrete.

TL;DR: In this paper, the influence of the cell micro-topology on the in-plane dynamic crushing of honeycombs is studied by means of explicit dynamic finite element simulation using ANSYS/LS-DYNA.

TL;DR: In this article, an analytical perforation model based on the cylindrical cavity expansion theory has been reformulated and used to calculate the ballistic perfation resistance of the aluminium plates.

TL;DR: In this paper, the response of square metallic sandwich panels with a cellular core under blast loading was investigated using the LS-DYNA finite element simulation software, and a good agreement has been obtained between the numerical and experimental results, and thus the proposed FE model can be considered as a valuable tool in assessing and understanding the deformation/failure mechanism and predicting the dynamic response of the sandwich structures.

TL;DR: In this article, a numerical simulation tool was used to further study the combined blast and fragment loading effects on a reinforced concrete wall, and the results showed that the overall damage of the wall strip subjected to combined loading was more severe than if adding the damages caused by blast and fragmentation loading treated separately, which also indicates the synergetic effect of the combined loading.

TL;DR: In this paper, a buckling initiator near the impact end of a square tube is proposed to reduce the initial peak force of the square tube while retaining its deformation mode and energy absorption.

TL;DR: In this paper, the cut and puncture resistance of thermoplastic (TP) impregnated, woven aramid fabric is characterized under quasi-static and dynamic stab testing conditions.

TL;DR: In this paper, the authors examined the strain-rate sensitivity of four high-strength, high-toughness steels at strain-rates ranging from 0.0002 s − 1 to 200 s −1 : AerMet 100, modified 4340, modified HP9-4-20 and a recently developed Eglin AFB steel alloy, ES-1c.

TL;DR: In this article, the authors used the LS-DYNA finite element code to simulate an HRAM event created by a steel spherical projectile impacting a water-filled aluminium square tube.

TL;DR: In this article, three-point bending tests on notched beams of a high-strength concrete have been conducted using both a servo-hydraulic machine and a self-designed drop-weight impact device.

TL;DR: In this paper, the authors developed a robust methodology for obtaining the pre-impact pedestrian posture and vehicle speed utilizing multi-body simulations and optimization techniques, and evaluated the robustness and efficiency of three optimization algorithms in a mock (idealized) crash reconstruction.

TL;DR: In this article, a new model is proposed using an asymptotic intermediate approximation of viscosity that is based on analyses at different structural levels, which provides a good description of the rock mass strength over a wide range of strain rates.

TL;DR: In this article, a modified type-12 impact tester is used to measure the impact induced ignition of nano-aluminum particle composites that also include Ni, MoO3, or Teflon.

TL;DR: Wang et al. as mentioned in this paper modeled the relations between pedestrian impact speed and deflection of windshield glazing based on the impact dynamics and thin plate theory, and developed a model of vehicle impact speed versus deflection.

TL;DR: In this article, the authors analyzed the collapse strength of periodic planar lattices under uniaxial compression and showed that the average dynamic stress can be expressed as the sum of the average static stress and the dynamic enhancement caused by the inertia effect.

TL;DR: In this paper, energy absorption in thin (0.4mm) steel plates during perforation by spherical projectiles of hardened steel, at impact velocities between 200 and 600m/s −1.

TL;DR: In this paper, a recipe for the gelatine is suggested in order to use as a reference in further bird test certification procedures and results from the tests are also given so that they can be used to validate numerical models and promote the use of numerical tools in aircraft design and certification process.

TL;DR: In this article, a weighted multi-objective identification strategy is presented for estimating Johnson-Cook material parameters often used in general purpose finite element models, and the method is shown through illustrative examples for two different materials (Nitronic 33 super alloy and Ti-6Al-4V) using sets of data from quasi-static and split Hopkinson pressure bar (SHPB) compression experiments with varying temperature and strain rates.