Investigation of Low Velocity Impact Response of Aluminium Honeycomb Sandwich Panels (original) (raw)
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Low-velocity impact failure of aluminium honeycomb sandwich panels
Composite Structures, 2008
In this paper, the failure response of aluminium sandwich panels subjected to low-velocity impact is discussed. A three-dimensional geometrically correct finite element model of the honeycomb sandwich plate and a rigid impactor was developed using the commercial software, ABAQUS. This discrete modelling approach enabled further understanding of the parameters affecting the initiation and propagation of impact damage. Strain-hardening behaviour of the aluminium alloys and the honeycomb core density were shown to affect the impact response. In addition, the impulse-momentum equation was incorporated into the energy-balance model, so that the impact force and deflection histories could be determined as well.
Aluminum Metallic sandwich structures with auxetic core are found to be good energy absorbers for impact protection. The ballistic performance of honeycomb sandwich panels (HSPs) subjected to in-plane projectile impact has been studied by means of explicit dynamic nonlinear finite element simulations. The HSPs, under investigation, consisted of two identical aluminum alloy face-sheets and an aluminum honeycomb core featuring two types of unit cell configurations, namely, regular and re-entrant hexagons. In modeling, the effects of several key parameters, like impact velocity, length, thickness and angle of the unit cell ribs, on the ballistic limit and energy absorption of the auxetic core panels during perforation are discussed in detail. Impact perforation experimental test also carried out and the results are analyzed to verify the theoretical finite element model. It has found that HSPs with re-entrant auxetic honeycomb core has the best ballistic resistance, due to the negative Poisson's ratio effect of the core. The geometric parameters have show non-monotonic effects on the panel's ballistic capacities.
Ballistic Impact Response of an Aluminum Sandwich Panel with Auxetic Honeycomb Core Structure
The International Conference on Applied Mechanics and Mechanical Engineering
Aluminum Metallic sandwich structures with auxetic core are found to be good energy absorbers for impact. The ballistic performance of honeycomb sandwich panels (HSPs) subjected to in-plane projectile impact has been studied by means of explicit dynamic nonlinear finite element simulations. The HSPs, under investigation, consist of two identical aluminum alloy face-sheets and an aluminum honeycomb core featuring two types of unit cell configurations, namely, regular and re-entrant hexagons. In modeling, the effects of several parameters like impact velocity, length, thickness and angle of the unit cell ribs, on the ballistic limit and energy absorption of the auxetic core panels during perforation are discussed in detail. Impact ballistic tests were also carried out and the results were compared with that of the theoretical finite element model. It has been found that HSPs with re-entrant auxetic honeycomb core has better ballistic resistance than regular ones, due to the negative Poisson's ratio effect of the core. The geometric parameters have shown non-monotonic effects on the panel's ballistic capacities.
Quasi-Static and Low-Velocity Impact Failure of Aluminium Honeycomb Sandwich Panels
Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, 2006
This article presents an extensive experimental and numerical investigation of aluminium sandwich plates subjected to quasi-static loading and low-velocity impact. The objective of this research is to understand and, ultimately, predict the initiation and progression of damage in an aluminium sandwich plate subjected to low-velocity impact. The static indentation and impact problems were analysed using the commercial finite-element software, ABAQUS. Quasi-static indentation tests and low-velocity drop weight tests were conducted to characterize the failure and to determine the extent of damage observed in aluminium sandwich plates. Comparison of the numerical load history, specimen damage area, and residual indentation with experimental results demonstrated the ability of the modelling methodology to capture the impact characteristics. Experimental results also indicated that the damage mode experienced on the impacted facesheet may be correlated to the energy absorbed by the plate ...
Impact Response of Sandwich Structures with Auxetic and Honeycomb Core
2019
Impact behavior of sandwich panels with auxetic and hexagonal honeycomb cores are investigated experimentally and numerically. Re-entrant and anti-tetrachiral geometries are considered for auxetic cores. In the experimental side of the study, auxetic and honeycomb cores are produced using a 3D printer. The sandwich panels are then produced by attaching aluminium face sheets and cores. The impact tests are performed using a particle impact test system. The numerical analyses are achieved by using LSDYNA finite element software. The deformation results are compared and the effect of having different type of core is evaluated.
Composites Part B: Engineering, 2012
In this paper, an analytical model for perforation of composite sandwich panels with honeycomb core subjected to high-velocity impact has been developed. The sandwich panel consists of a aluminium honeycomb core sandwiched between two thin composite skins. The solution involves a three-stage, perforation process including perforation of the front composite skin, honeycomb core, and bottom composite skin. The strain and kinetic energy of the front and backup composite skins and the absorbed energy of honeycomb core has been estimated. In addition, based on the energy balance and equation of motion the absorbed energy of sandwich panel, residual velocity of projectile, perforation time and projectile velocity have been obtained and compared with the available experimental tests and numerical model. Furthermore, effects of composite skins and aluminium honeycomb core on perforation resistance and ballistic performance of sandwich panels has been investigated.
Experimental study of the medium velocity impact response of sandwich panels with different cores
Materials & Design, 2016
The impact response of sandwich panels is not only dependent on the facesheet but also on the core material. The choice of the core has a strong effect on the strength and durability of the structure. This paper compares the dynamic response of sandwich panels with different core materials when subjected to medium velocity impacts. The sandwich panels were made of aluminium facesheets with five different cores, viz., low density balsa wood, high density balsa wood, cork, polypropylene honeycomb, and polystyrene foam. All the specimens were impacted by a 384.4 g instrumented projectile with a hemispherical steel head at three impact energies of 43, 85 and 120 J. An accelerometer attached to the projectile and a high speed camera were used to collect data and record the impact process. 3D scanning technique was used to measure the deformation of front and back faces after impact. The impact properties of the sandwich panels with the five different cores were compared in terms of contact force, energy absorption, depth of indentation, overall bending deflection, etc. Post-mortem sectioning was also conducted to examine the impact induced failures such as facesheet rupture, crush of core material, and debonding between facesheet and core.
Impact response of aluminum foam core sandwich structures
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2011
Sandwich panels, comprised of metallic foam core and face sheets, are widely used to withstand impact and blast loadings. Based on the actual application requirements, the performance can be optimized with the proper combination of face sheets design. In this paper the impact responses of aluminum foams with various tailored face sheets, whose behavior represents elastic, elastic-ideally plastic and elastic-plastic strain work hardening, were investigated experimentally. The experiment was carried out using hemispherical indenters on blocks of aluminum foam with and without the face sheet. Competing failure modes for the initiation of failure are discussed based on comparison of energy absorption capacity. Results show that increase in thickness of foam and the use of face sheet enhances the impact energy absorption capacity. The type of face sheet not only affects the energy absorption capacity but also the failure mode for the foam blocks. Aluminum foam blocks with stainless steel sheet are strong enough to withstand the pre-designated impact loading without penetration damage. At the same time, this study also provides a comparison of the impact performance, in terms of impact energy and failure mode, among blocks with different face sheets under the low velocity impact.
Experimental Study on Static and Dynamic Response of Aluminum Honeycomb Sandwich Structures
Materials, 2022
Honeycomb aluminum structures are used in energy-absorbing constructions in military, automotive, aerospace and space industries. Especially, the protection against explosives in military vehicles is very important. The paper deals with the study of selected aluminum honeycomb sandwich materials subjected to static and dynamic compressive loading. The used equipment includes: static strength machine, drop hammer and Split Hopkinson Pressure Bar (SHPB). The results show the influence of applied strain rate on the strength properties, especially Plateau stress, of the tested material. In each of the discussed cases, an increase in the value of plateau stresses in the entire strain range was noted with an increase in the strain rate, with an average of 10 to 19%. This increase is mostly visible in the final phase of structure destruction, and considering the geometrical parameters of the samples, the plateau stress increase was about 0.3 MPa between samples with the smallest and larges...