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Energy Absorption Characteristics of Thin Walled Metallic and Foam Filled Tubular Structure with Different Cross-Sections
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247267395-1-Symmetric-and-distributed-shared-memory-architectures-ppt (1).ppt
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Energy Absorption Characteristics of Thin Walled Metallic and Foam Filled Tubular Structure with Different Cross-Sections
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 09 | Sep -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 110 Energy Absorption Characteristics of Thin Walled Metallic and Foam Filled Tubular Structure with Different Cross-Sections Chinmay Morajkar Master of Technology, Machine Design Student of Mechanical Engineering Department, UBDTCE Davangere, Karnataka, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract – The thin –walled structures are been used widely as energy absorbers in industries such as aerospace, shipping and automobile. The energy absorption behavior of tubular structures depends on various factors in which one of them is cross sectional geometry of tube structures .In this paper Metallic tubular structures and foam filled metallic tubular structures with different cross sections are studied. The tubular structures with different sections such as circular, hexagonal, triangular and square are studied based on the energy absorption point of view. The tubes have the same height, average section area, volume, thickness and material which are subjected to quasi static loading. Theeffectof foam has been studied during the crushing process since foam can be used for different crash analysis problem. The numerical model has been modeled and meshed using hyper mesh and analyzed using commercial explicit finite element solver Ls- Dyna. Finally the metallic and foam filled metallic tubes analysis results are being compared based on the energy absorption point of view. Key Words: Specific Energy Absorption, Crushing Load, Piecewise Linear Plastic, Crushable Foam, Quasi Static Process. 1. INTRODUCTION Safety of the passenger and driver has become an issue almost from the beginning of mechanized road vehicle development. Vehicle is used extensivelyanda largenumber of safety accidents related to them occur widely. Using energy absorbers is an appropriate option for this purpose. As an energy absorber in crashworthiness applicationssuch as cars, ships, trains, aero-planes and other high-volume industrial products, the thin-walled structures have been widely used to ensure crash safety due to their lightweight, low cost and high energy absorption. Tubular structures provide widest range of possible energy absorbing system for any simplestructures.Apartfromtheir use as energy absorbers, their common existence as structural elements implies an in strict energy absorbing capability in the largest part of the aerospace and automobile structures. Metallic foams is being used in aerospace industry in different components to absorb the energyofanimpactorin shielding devices to reduce the shock wave from a blast which might also have complex shapes, Aluminum, nickel, iron, copper, titanium and platinumaresomeofthecommon metals which are used to prepare metallic foams. In this paper, energy absorption capacity of thin walled metallic and foam filled metallic tubes with various section geometries are investigated and studied numerically. 1.1 LITERATURE SURVEY In order to carry out the entitled work an extensive literature survey was done by collecting and studying the number of relevant journals, articles and technical papers from the available resources. Tubular structures are been used as energy absorbers in various aerospace and automobile applications. Tubular structures providehighspecificenergyabsorptioncapability as well as light weight advantage. So it becomes an important part to study the tubular structureswithdifferent shapes. The effect of various cell configuration on energy absorption behavior of tubular structures were carried out by the different researchers,thenumerical andexperimental correlation was given by Ali Alavi Nia et.al [1] andnumerical examination was carried out by Younes et.al [2] for thin walled tubes with various section shapes by maintaining same mass for each case and found that the circular tubes has the most energy absorption capacity [1] and the energy absorption capability of tubular structure increases with increase in number of sides [2]. The study is carried out by using foam filled tubular structure which shows better results compared to metallic structures as well asduringout of planes impacting condition along with the cell geometry the cell foil thickness, cell side size, cell expanding anglealso affects the energy absorption capacitytubularstructures[3]. Alexander et.al [4] accomplished the first studies on the collapse mode of cylindrical tubes under axial loads. The theoretical model for collapse of steel conical tubes based on experimental observation was done by Al-Hassani et.al [5] and Mamalis et.al [6]. The average crushing load of square tubes under axial static loads was studied experimentallyby Abramowiz and Jones et.al [7]. They also carried out several experiments on circular and square tubes under dynamic loading conditions and presented a modification of Alexander’s theoretical model.
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 09 | Sep -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 111 In spite of the much research performed on circular thin- walled tubes, the attempt to further improve the crushing behavior of thin walled tubes by designing an efficient energy absorbing material is highly desired. This numerical study aims to improve the energy absorbing capacity of the thin-walled tubes subjected to axial quasi static loading. 1.2 METHODOLOGY In order to understand the crushing behavior of the tubular structures based on energy absorbing characteristics during impact event, the methodology is adopted. Based on the study of available literaturetheprocessofenergyabsorption behavior of thin walled structures is examined. In order to correlate the numerical analysis the impact study has been carried out on the thin walled structures of metallic as well as foam filled structures by applyingtheloadonthedifferent geometries cross section. For this case the modeling of the tubular structure is done by using the available modeling and meshing tool HYPERMESH V12.0. Then the analysis is carried out by importing the model to available solver tool LS DYNA 971 R 8.0 solver. 2. FINITE ELEMENT ANALYSIS The Finite Element model consists of tubular structure and two rigid blocks, the tube structures are made up of shell elements and two rigid blocks are taken as solid elements. Modelling is carried out in HYPERMESH and analysis is carried out using LS DYNA. The geometric model considered for theanalysisisasshown in Fig-1 and it consists of Lower block and upper block which are movable and fixed respectively, In between a tubular structure is present which is of 100mm length. The meshed model considered for the analysisisasshowninFig- 2. Fig-1 Geometric model of tubular structure All the tubular sections are having same length, average section area and volume, the specifications of these are as shown in Table-1. Table -1: Specification of tubular structure Fig-2 Meshed model of tubular structure 3. BOUNDRY AND LOADING CONDITIONS The model geometry includes thin walled tubular structure with metallic and foam filled tube between two rigidparts at sits ends. The boundary conditions are the same as the experimental test conducted by the reference [1] the upper block is completely constrained in all directionswhereasthe lower block can move with a velocity of 100mm/s in the upward direction. 4. MATERIAL PROPERTIES The material model for the tube, foam and blocks are *MAT_PIECEWISE_LINEAR_PLASTICITY, *MAT_CRUSHABLE_FOAM and *MAT_RIGID, respectively. The material used for the metallic tube structure is Al3003 and foam is of carbon Nano. The material properties of Al3003 tube are tabulated in Table-2. Table-2 Properties of Al3003
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 09 | Sep -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 112 The carbon Nano foam materials are crushable foam with very less recovery, unlike foam material which is used in most of the automotive and aerospace seating systems. As carbon Nano foams are rigid foams and in this study the strain hardening and strain rate effects of the material are not considered. The material properties for carbon Nano foam are tabulated in Table-3. Table-3 Properties of Carbon Nano foam In this material model, arbitrary yield stress versus volumetric strain values are defined as shown in Fig-3. Fig-3 Yield stress versus Volumetric strain In order to supply appropriate conditions for deformations, ‘‘contact automatic surface to surface title’’ sand ‘‘contact automatic single surface title’’ are usedfortube-foam,tubes- rigid part elements and tube elements with each other respectively. 5. FINITE ELEMENT ANALYSIS OF METALLIC AND FOAM FILLED METALLIC TUBES Specimen Shape Before loading After loading Triangular Squarer Hexagonal Circular Fig-4 Tube structures before and after loading for metallic tubes Specimen Shape Before loading Before loading Triangular Squarer Hexagonal
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 09 | Sep -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 113 Circular Fig-5 Tube structures before and after loading for metallic tubes filled with foam 6. COMPARITIVE ANALYSIS OF METALLIC AND FOAM FILLED METALLIC TUBES The Chart-1 shows the energy absorption characteristics of metallic tubular structures. From these results it is investigated that the maximum energy absorption is in circular and hexagonal followed by squarer and triangular tubular structures. Chart-1 Energy absorption plot for different metallic tubular structures The results obtained from the finite element analysis for metallic tubular structures filled with foam are compared with the metallic tubular structure sand are as shown in Table-4 Table-4 Comparison of results for metallic tubes filled with foam and metallic tubes Chart-2 Energy absorption plot for metallic tubular structure filled with foam 7. CONCLUSIONS This investigation reveals that the energy absorption is maximum for circular metallic tubes and least for triangular metallic tubes which mean that the energy absorption capacity changes with number of sides of tube. The energy absorption increases if themetallictubesarefilledwithfoam form the above results it can be stated that the energy absorption is more for Hexagonal metallic tubes filled with foam and least for squarer metallic tubes filled with foam. It can be also noted that from the above numerical analysisthe metallic tube filled with foam provides better energy absorption compared to metallic tubes. REFERENCES (1) Ali Alavi Nia, "Comparative analysis of energy absorption and deformationsofthinwalledtubeswith various section geometries," Thin walled Structures, pp. Vol 48/946-954, 2010. (2) M.M.Younes, "Finite Element Modeling of Crushing Behaviour of thin tubes with various cross sections," Aerospace sciences and aviation technologyASAT, pp. 1-19, 2013. (3) Ahmad Partovi Meran, "Numerical and Exprimental study of crashworthiness parameters of honeycomb structures," Thin-walled Structures, pp. Vol78/87-94, 2014. (4) Alexander, “An approximate analysisofthecollapseof thin cylindrical shells under axial loading”,Mech Appl Math 1960;(1):10-5 (5) Al-Hassani STS, “Characteristics of inversion tube under axial loading”,J Mech Eng Sci 1972;14:370-81 (6) Mamalis AG, “The crumpling of steel thin-walledtubes and frusta under axial compression atelevatedstrain- rate”,Int J Mech Sci 1984;26:537-47 (7) Abramowicz W, Jones “Dynamic axial crushing of square tubes”, Int J Mech Sci 1986;28(4):219-29
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