Experimental Investigation of Bending behaviour of Aluminium Alloy Honeycomb Sandwich Structure using Four Point Bending Tests (original) (raw)
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The strength characteristics of aluminum honeycomb sandwich panels
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Aluminum sandwich construction has been recognized as a promising concept for structural design of lightweight transportation systems such as aircraft, high-speed trains and fast ships. The aim of the present study is to investigate the strength characteristics of aluminum sandwich panels with aluminum honeycomb core theoretically and experimentally. A series of strength tests are carried out on aluminum honeycomb-cored sandwich panel specimen in three point bending, axial compression and lateral crushing loads. Simplified theories are applied to analyze bending deformation, buckling/ultimate strength and crushing strength of honeycomb sandwich panels subject to the corresponding load component. The structural failure characteristics of aluminum sandwich panels are discussed. The test data developed are documented.
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This study will present the Experimental, numerical and analytical characterizations of composite sandwich structures needed to optimize structure design. In this study, the effects of varying honeycomb core ribbon orientation and varying face sheet thickness's have on the flexural behavior of honeycomb sandwich structures was investigated. Honeycomb sandwich panels were constructed using Hexcel 6367 A250-5H carbon fiber face sheets and Hexcel Nomex HRH-10-1/8-5 honeycomb cores. The mechanical properties of the constituent materials were discovered experimentally using ASTM standards and theoretical models using honeycomb mechanics and classical beam and plate theory are described. A failure mode map for loading under three point bending is developed from previous works by Triantafillou and Gibson 26 , showing the dependence of failure mode on face sheet to core thickness and honeycomb core ribbon orientation. Beam specimens are tested with the effects of Honeycomb core ribbon orientation and unequal face sheet thickness's examined. Experimental data sufficiently agrees with theoretical predictions. A finite element model was developed in ABAQUS/CAE to validate experimental and analytical analysis and produced agreeable results. Optimal bending stiffness and strength with respect to minimum weight was analyzed. The results reveal an important role core ribbon orientation has in a sandwich beam's bending behavior, and design of unequal ply count face sheets can produce higher stiffness to weight ratios than conventional symmetric sandwich structures of similar weight when subjected to a single static load.
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...
Journal of King Saud University - Science, 2019
Sandwich structures with glass fiber face sheets and aluminum honeycomb core are investigated computationally and experimentally. A three point bending load arrangement is conducted to examine the static and fatigue performance of honeycomb sandwich panel. Under static loading, the load and displacement response is indicated in five phases. The decrease in fatigue life with load level was observed in approximately linear manner. The visual and Scanning Electron Microscopic (SEM) analysis were carried out to analyze the failure modes. For static and high amplitude fatigue load, the failure initiates due to face yielding, while for low fatigue load failure initiates as a result of delamination at core and skin interface. However, in all cases principle failure mode is indentation. The honeycomb sandwich structure was also modeled with commercially available finite element packages ANSYS and the fatigue analyses were carried out to determine the life of specimens under load-displacement response. The experimental results were in good agreement with the Finite Element Analysis (FEA) results in both static and fatigue loads, and fracture modes prediction.
Analysis and investigation of honeycomb sandwich panel parameters under Static three-point bending
Investigation of the sandwich structures under bending has an important role to understanding the composite structures stability. Bending behavior of sandwich structures has a wide range of applications in science, engineering and technology. In this study the effects of core shape, cell wall height, wall thickness and skin thickness on critical bending load of honeycomb sandwich panels have been investigated. The other parameters of sandwich panel supposed constant during all analyses. The finite element simulation has been carried out with using of ABAQUS software and results were compared with experimental results. After that design of experiment based on Taguchi method has been carried out for understanding the effect of investigated parameters on maximizing the critical bending load. Eventually, the effect of parameters has been investigated with using of ANOVA.
The goal of this research was the analysis of edgewise bending response of sandwiches, which consists of aluminium honeycomb sandwich reinforced by outer skins made of glass fiber reinforced epoxy matrix. The test results at different values of support span distances in terms of peak loads and absorbed energy were compared with those obtained by flatwise bending tests and by similar tests on aluminium honeycomb sandwiches without outer skins. The failure mechanisms have been also investigated. The experimental results presented that the sandwiches in the edgewise position failed at a higher load with less deflection compared to the specimens tested in the flatwise position. The current work has an important role in several areas, such as transport industry, in which lightweight structures with high capacity of energy dissipation is required.
Strength Analysis on Honeycomb Sandwich Panels of different Materials
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Aluminum sandwich construction has been recognized as a promising concept for structural design of light weight systems such as wings of aircraft. A sandwich construction, which consists of two thin facing layers separated by a thick core, offers various advantages for design of weight critical structure. Depending on the specific mission requirements of the structures, aluminum alloys, high tensile steels, titanium or composites are used as the material of facings skins. Several core shapes and material may be utilized in the construction of sandwich among them, it has been known that the aluminum honeycomb core has excellent properties with regard to weight savings and fabrication costs.This paper is theoretically calculate
Bending Behavior of Aluminum Honey Comb Sandwich Panels
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Aluminum sandwich construction has been recognized as a promising concept for structural design of light weight systems such as wings of aircraft. A sandwich construction, which consists of two thin facing layers separated by a thick core, offers various advantages for design of weight critical structure. Depending on the specific mission requirements of the structures, aluminum alloys, high tensile steels, titanium or composites are used as the material of facings skins. Several core shapes and material may be utilized in the construction of sandwich among them, it has been known that the aluminum honeycomb core has excellent properties with regard to weight savings and fabrication costs. This paper is theoretically calculate bending behavior, of sandwich panels and to compare the strength to weight ratios of Normal Aluminium rod(panel) and Aluminium Honey Comb Panel .
14.Flexural Behavior of Sandwich Structure with AA 8011 Honeycomb Core and Al 1100 Face Skins.pdf
Internat ional Journal of Vehicle Structures & Systems, 2018
This paper details the fabrication and flexural testing of sandwich structure with Aluminium honeycomb core with Aluminium face skins. The material for the face skin is aluminium 1100 and for the core is Aluminium AA8011. The cell size obtained by fabrication is 7mm. The specimen is prepared and tested as per the ASTM standard C393/C393M-11 on a three-point bending test to obtain the ultimate core shear strength and the face skin strength. Finite element analysis is also carried out to validate the experimental test.
Design, Modelling and Manufacturing aspects of Honeycomb Sandwich Structures: A Review
Honeycomb sandwich panels are widely used in automobile, aerospace and space structures due to unique characteristics like high strength to weight ratio and High stiffness. Honeycomb sandwich panels consist of honeycomb core made of either metal or thin paper like materials. Core is sandwiched with metallic or composite face sheets. Core gives high compressive strength in T direction whereas face sheet gives shear strength in T and W direction. Compressive strength of sandwich panel depends on foil thickness of honeycomb core, cell size, thickness of core in T direction and face sheet thickness. For nearly same weight honeycomb sandwich panels can give up to 30 times higher stiffness than metallic sheets. Face sheets of the sandwich structure facilitate mounting of the instruments as core has very high volume fraction of cavity and hence cannot hold fasteners alone.Modelling of Honeycomb sandwich structures with actual cell configuration is difficult and time consuming. Hence sandwi...