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Gotowa bibliografia na temat „Sandwich composite beam”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Sandwich composite beam"

Zhu, Xiujie, Chao Xiong, Junhui Yin, Dejun Yin i Huiyong Deng. "Bending Experiment and Mechanical Properties Analysis of Composite Sandwich Laminated Box Beams". Materials 12, nr 18 (12.09.2019): 2959. http://dx.doi.org/10.3390/ma12182959.

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The failure modes, ultimate load, stiffness performance, and their influencing factors of a composite sandwich laminated box beam under three-point bending load are studied by an experiment, finite element model, and analytical method. The three-point bending experiment was carried out on three different core composite sandwich laminated box beams, and the failure modes and bearing capacity were studied. With the use of composite progressive damage analysis and the core elastoplastic constitutive model, the finite element model of the composite sandwich laminated box beam was established, and the three-point bending failure process and failure modes were analyzed. The analytical model was established based on the Timoshenko beam theory. The overall bending stiffness and shear stiffness of the composite sandwich laminated box beam were calculated by the internal force–displacement relationship. The results show that the composite sandwich laminated box beam mainly suffers from local crushing failure, and the errors between the finite element simulation and the experiment result were within 7%. The analytical model of the composite sandwich laminated box beam can approximately predict the overall stiffness parameters, while the maximum error between theoretic results and experimental values was 5.2%. For composite aluminum honeycomb sandwich laminated box beams with a ratio of span to height less than 10, the additional deflection caused by shear deformation has an error of more than 25%. With the ratio of circumferential layers to longitudinal layers increasing, the three-point bending ultimate load of the composite sandwich laminated box beam increases, but the ratio of the overall stiffness to mass reduces. The use of low-density aluminum foam and smaller-wall-thickness cell aluminum honeycombs allows for the more obvious benefits of light weight.

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Zlamalova, Pavlina, Petr Štěpánek, Frantisek Girgle, Vojtech Kostiha i Petr Daněk. "Static Analysis of Sandwich Composite Panels". Key Engineering Materials 930 (31.08.2022): 133–39. http://dx.doi.org/10.4028/p-49f405.

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This paper describes the development of a sandwich composite beam based on FRP materials which is a suitable alternative to reinforced concrete beams in specific applications. These FRP materials show higher durability and stability compared to reinforced concrete in aggressive environments (e.g. wastewater treatment plants). Compared to pultruded FRP beams, the developed solution better utilizes the properties of the sub-components. The results of this research suggest that the optimum use of composite materials is when the upper and lower flanges of the beam consist of pultruded composite profiles in the TT cross-section and the standing composite grating; this creates a relatively stiff beam with a high load-bearing capacity and resistance to aggressive environments at a very low self-weight. The final properties of this beam can be adjusted thanks to the variability of the dimensions of the web as well as the variability of a suitable laminate surface treatment. This in the final combination creates a sandwich composite structure. The behaviour of the composite beam is then confirmed in this paper using a four-point bending test. Different configurations of the beam design allowed us to determine the influence of the laminate surface layer (verification of the sandwich functionality), but also the influence of the beam connection at the standing point on the resulting behaviour. The results of the experiments demonstrated the optimal physical and mechanical parameters of the sandwich composite beam structure and gave us insights for further use of this type of structure.

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Selvaraj, Rajeshkumar, Kamesh Gupta, Shubham Kumar Singh, Ankur Patel i Manoharan Ramamoorthy. "Free vibration characteristics of multi-core sandwich composite beams: Experimental and numerical investigation". Polymers and Polymer Composites 29, nr 9_suppl (listopad 2021): S1414—S1423. http://dx.doi.org/10.1177/09673911211057679.

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This study investigates the free vibration responses of laminated composite sandwich beam with multi-cores using experimental and numerical methods. The laminated composite face sheets are made by using hand layup method. An experimental modal test has been carried for different configurations of multi-core sandwich beams under different end conditions. The single-core and multi-core sandwich beams has been modeled and the natural frequencies of sandwich beams are determined using ANSYS software. The numerical model is verified by comparing the obtained natural frequencies with experimental results. The numerical and experimental results indicate that the multi-core sandwich beam greatly influences the structural stiffness compared with single-core sandwich beam under different end conditions. Furthermore, the influence of several parameters such as the end conditions, thickness of the core layer, and stacking sequence on the natural frequencies of the various configurations of the multi-core sandwich beams are presented.

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Lu, Ping, Xu Dong Liu, Xue Qiang Ma i Wei Bo Huang. "Analysis of Damping Characteristics for Sandwich Beams with a Polyurea Viscoelastic Layer". Advanced Materials Research 374-377 (październik 2011): 764–69. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.764.

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Constrained layer damping treatments such as sandwich beams are considered as the most efficient way of introducing vibration damping into a structure. The dynamic mechanical properties and damping behavior of a laminated sandwich composite beam inserted with a viscoelastic layer is investigated. A quantitative analysis of damping in the sandwich laminated composite beam has been conducted through the theoretical and experimental method. Traditional epoxy and new kind of polyurea viscoelastic layer are selected to analyze the damping properties. Results showed that the polyurea viscoelastic layer had good dumping capability. The effects of temperature, frequency of viscoelastic layer on vibration damping characteristics arc also discussed. They also demonstrate the great capability of laminated sandwich composites with embedded viscoelastic layer to considerably enhance structural damping.

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WEI, KEXIANG, GUANG MENG, HONGQUAN LU i SHISHA ZHU. "DYNAMIC ANALYSIS OF ROTATING ELECTRORHEOLOGICAL COMPOSITE BEAMS". International Journal of Modern Physics B 19, nr 07n09 (10.04.2005): 1236–42. http://dx.doi.org/10.1142/s0217979205030128.

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The modeling and vibration properties of rotating electrorheological (ER) sandwich beams are discussed. The proposed beam is composed of three layers with ER fluids sandwiched between two elastic layers. Based on the Hamilton's principle and finite element method (FEM), the equations of motion of ER beam are derived. The effects of different electric fields, rotating speed and thickness ration on the resonant frequencies and modal loss factors are presented. The results of numerical simulation show that the model loss factor of rotating ER beam can be substantially increased when applied an electric field. The ER materials have a significant effect on the vibration suppression of rotating composite beam.

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Gdoutos, E. E., i M. S. Konsta-Gdoutos. "Load and Geometry Effect on Failure Mode Initiation of Composite Sandwich Beams". Applied Mechanics and Materials 3-4 (sierpień 2006): 173–78. http://dx.doi.org/10.4028/www.scientific.net/amm.3-4.173.

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Facing compressive failure, facing wrinkling and core shear failure are the most commonly encountered failure modes in sandwich beams with facings made of composite materials. The occurrence and sequence of these failure modes depends on the geometrical dimensions, the form of loading and type of support of the beam. In this paper the above three failure modes in sandwich beams with facings made of carbon/epoxy composites and cores made of aluminum honeycomb and two types of foam have been investigated. Two types of beams, the simply supported and the cantilever have been considered. Loading included concentrated and uniform. It was found that in beams with foam core facing wrinkling and core shear failure occur, whereas in beams with honeycomb core facing compressive failure and core shear crimping take place. Results were obtained for the dependence of failure mode on the geometry of the beam and the type of loading. The critical beam spans for failure mode transition from core shear to wrinkling failure were established. It was found that initiation of a particular failure mode depends on the properties of the facing and core materials, the geometrical configuration and loading of composite sandwich beams.

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Baba, Buket Okutan, i Ronald F. Gibson. "The Vibration Response of Composite Sandwich Beam with Delamination". Advanced Composites Letters 16, nr 2 (marzec 2007): 096369350701600. http://dx.doi.org/10.1177/096369350701600204.

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The aim of this study is to report the effect of delamination on the vibration characteristics of composite sandwich beams. The natural frequencies and corresponding vibration modes of a free-free sandwich beam with delamination of various sizes and locations are predicted using a two-dimensional finite element analysis (FEA). The presence of delamination affects the stiffness of the delaminated beam and results in differences on the natural frequencies of the beam. Assessment of the differences light the way for the existence, size and location of the delaminated region and can be used for a non-destructive evaluation of the damage characteristics of the delaminated beams. Vibration tests are conducted on fully bonded sandwich beams with carbon/epoxy laminated composite faces and foam core to verify the finite element results. Agreement between predictions of the model and experimental observations is good.

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Tripa, Mihai Sorin, Sorcoi Dorina, Lucia Ghioltean, Adriana Sorcoi i Mihaela Suciu. "Bending Calculus for Bio-Composite Sandwich Beams with Two Equal Consoles". Applied Mechanics and Materials 859 (grudzień 2016): 46–51. http://dx.doi.org/10.4028/www.scientific.net/amm.859.46.

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Aeronautic industries, medicine, automotive industries are domains in which the composite materials are very important. In orthopedics and orthodontist domains, titanium and its alloys are very used, because their mechanical properties are similar to bone tissue. Bio-composite sandwich beams have high stiffness in flexion and good thermal characteristics. The analytical calculus for bending bio-composite beams is very important. We calculate the arrows for sandwich beams for two aspects: first – beam in four kinds of alloys (titanium alloys, stainless steel, aluminum alloys, Co-Cr-Mo alloys) and second – bio-composite sandwich beam, composed of two equal layers in same alloys and heart in: polyurethane foam, polystyrene foam, epoxide, phenolic, polyester, polyamides, balsa 1 and balsa 2 and compare its.

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Prasad, Meenu. "Analysis of Coconut Shell Concrete in the Sandwich Beam using ANSYS". International Journal for Research in Applied Science and Engineering Technology 9, nr VI (30.06.2021): 4552–57. http://dx.doi.org/10.22214/ijraset.2021.36010.

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SCS consists of a layer of unreinforced concrete core, sandwiched between two relatively thin steel plates with novel enhanced C-channel connectors. Compared to C-channel connectors, ECs directly link the two external steel faceplates. The cost of traditional materials used in the concrete is the major factor which increases the cost of constructions, so it is necessary to research for alternative construction materials. In this project, the concrete core is used as the coconut shell concrete. Coconut Shell is a waste, generated by industrial and agricultural processes, and has created disposal and management problems that pose serious issues of environmental pollution. The first objective is to analyze the composite properties at 0%, 10%, 20% and 30% of coconut shell in the sandwich beam using rules of mixture . The Rules of Mixture is an analytical equations that are used to calculate the composite properties of the material. Then analyze the effect of coconut shell sandwich beam in ANSYS software. Also compare the conventional sandwich beam and coconut shell sandwich beam. Analyze the strength and decaying of coconut shell sandwich beam using ANSYS.

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Wu, Helong, Sritawat Kitipornchai i Jie Yang. "Free Vibration and Buckling Analysis of Sandwich Beams with Functionally Graded Carbon Nanotube-Reinforced Composite Face Sheets". International Journal of Structural Stability and Dynamics 15, nr 07 (31.08.2015): 1540011. http://dx.doi.org/10.1142/s0219455415400118.

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This paper investigates the free vibration and elastic buckling of sandwich beams with a stiff core and functionally graded carbon nanotube reinforced composite (FG-CNTRC) face sheets within the framework of Timoshenko beam theory. The material properties of FG-CNTRCs are assumed to vary in the thickness direction, and are estimated through a micromechanical model. The governing equations and boundary conditions are derived by using Hamilton's principle and discretized by employing the differential quadrature (DQ) method to obtain the natural frequency and critical buckling load of the sandwich beam. A detailed parametric study is conducted to study the effects of carbon nanotube volume fraction, core-to-face sheet thickness ratio, slenderness ratio, and end supports on the free vibration characteristics and buckling behavior of sandwich beams with FG-CNTRC face sheets. The vibration behavior of the sandwich beam under an initial axial force is also discussed. Numerical results for sandwich beams with uniformly distributed carbon nanotube-reinforced composite (UD-CNTRC) face sheets are also provided for comparison.

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Rozprawy doktorskie na temat "Sandwich composite beam"

Davis, Richard Anthony. "The Effects of a Damage Arrestment Device on the Mechanical Behavior of Sandwich Composite Beams Under Four-Point Bending". DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/506.

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The demand for an insert on composite sandwich structures to aid in the arrestment of face-core delamination is of great need. This research studies the use of a damage arrestment device (DAD) that connects the carbon fiber face sheets to the foam core to find whether an increase in the structural integrity of the sandwich beam results. Experimental analysis was employed to test the samples and was verified by a theoretical and finite element approach. The mechanical properties of LTM45/CF1803 pre-impregnated carbon fiber and Last-A-foam FR 6710 polyvinylchloride foam were experimentally analyzed using ASTM D3039 and ASTM D1621 standards respectively to verify the manufacturer’s data for the given material. With all the mechanical data, the effects of adding DAD keys to a delaminated composite sandwich beam were studied under a four-point bending test using ASTM standard D6272 and compared with non-delaminated beams to see if an increase in ultimate strength could be achieved. The initial delamination in the beams under consideration was one inch in length and located in between the loaded span of the beam. Two control beams were utilized for comparison: one with no defects, and another with a one inch delamination introduced at the face-core interface. The DAD keys were added in two different configurations to potentially stop the delamination propagation and increase the ultimate strength. In the first configuration DAD keys were added 0.25 inches on either side of the initial delamination in the transverse direction and provided a significant increase in strength over the delaminated control beam. The second configuration had a DAD key running along the longitudinal axis of the sandwich beam and resulted in a significant increase in ultimate strength over the delaminated control beam. After testing ten successful samples for each of the six different configurations, it was concluded that the addition of DAD keys in both configurations significantly increased the structural integrity of both the delaminated and non-delaminated control beams. With all the experimental data acquired, finite element models were created in COSMOS. The purpose of the finite element analysis was to validate the experimental results by comparing the deflections of the beam subjected to four-point bending during the experiment to the deflections found numerically. The deflections for the various DAD key configurations found in the experimental work were in agreement with the finite element results.

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Glenn, Christopher Edward. "Fabrication and Structural Performance of Random Wetlay Composite Sandwich Panels". Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/43208.

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The random wetlay process is used to make fiber-reinforced thermoplastic sheets that can be compression molded into composite panels at little cost. By utilizing these composite panels as the facesheets of honeycomb sandwich structures, it is possible to greatly increase the bending stiffness of the composite without adding significant weight. The random wetlay composite facesheets used in this research consisted of 25% E-glass fibers and 75% PET by weight. The thickness uniformity of the facesheets was difficult to control. The core of the sandwich structure was HexWeb&174; EM. Three low-cost adhesives were examined for secondarily bonding the facesheets to the core: polyurethane glue; epoxy paste; and 3M Scotch-Grip&174; plastic adhesive. The polyurethane glue mixed with Cab-O-Sil filler was easiest to apply and provided the largest flatwise tensile strength. Mathematical models were developed to predict the static behavior of sandwich beams and plates in bending. Three-point bend tests were performed on a sandwich beam in accordance with ASTM C 393. A sandwich plate simply supported along two opposite edges and free along the other two edges was subjected to a line-load using weights and a wiffle tree arrangement. An effective facesheet modulus and Poissonâ s ratio were found by comparing the measured displacements to the sandwich plate theory. The shadow moirÃ© technique was used to visualize the displacement of the line-loaded sandwich plate. The overall shape of the displacement was very similar to the shape predicted by the sandwich plate theory.
Master of Science

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Hove, Darlington. "Finite element analysis of a composite sandwich beam subjected to a four point bend". Thesis, Nelson Mandela Metropolitan University, 2011. http://hdl.handle.net/10948/1465.

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The work in this dissertation deals with the global structural response and local damage effects of a simply supported natural fibre composite sandwich beam subjected to a four-point bend. For the global structural response, we are investigating the flexural behaviour of the composite sandwich beam. We begin by using the principle of virtual work to derive the linear and nonlinear Timoshenko beam theory. Based on these theories, we then proceed to develop the respective finite element models and then implement the numerical algorithm in MATLAB. Comparing the numerical results with experimental results from the CSIR, the numerical model correctly and qualitatively recovers the underlying mechanics with some noted deviances which are explained at the end. The local damage effect of interest is delamination and we begin by reviewing delamination theory with more emphasis on the cohesive zone model. The cohesive zone model relates the traction at the interface to the relative displacement of the interface thereby creating a material model of the interface. We then carry out a cohesive zone model delamination case study in MSC.Marc and MSC.Mentat software packages. The delamination modelling is carried out purely as a numerical study as there are no experimental results to validate the numerical results.

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Ho, Qhinhon D. "An Assessment Of The Accuracy Of The Euler-Bernoulli Beam Theory For Calculating Strain and Deflection in Composite Sandwich Beams". ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/2084.

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This study focuses on assessing the accuracy of the Euler-Bernoulli beam theory as computational bases to calculate strain and deflection of composite sandwich beam subjected to three-point and four-point bending. Two groups of composite sandwich beams tests results will be used for comparison purposes. Mechanical properties for the laminated skin are provided by researchers from University of Mississippi (Ellen Lackey et al., 2000). Mechanical properties for the balsa wood core are provided by Alcan Baltek Corporation. Appropriate material properties and test geometries are then used in the Euler-Bernoulli-based algorithm in order to generate analytical data for comparison to experimental data provided by researchers from University of New Orleans (UNO, 2005). The resulting single material cross section is then analyzed in the traditional manner using the Euler-Bernoulli beam theory. In general, the Euler-Bernoulli beam theory provides an appropriate analytical approach in predicting flexural behavior of composite sandwich beams.

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Petras, Achilles. "Design of sandwich structures". Thesis, University of Cambridge, 1999. https://www.repository.cam.ac.uk/handle/1810/236995.

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Failure modes for sandwich beams of GFRP laminate skins and Nomex honeycomb core are investigated. Theoretical models using honeycomb mechanics and classical beam theory are described. A failure mode map for loading under 3-point bending, is constructed, showing the dependence of failure mode and load on the ratio of skin thickness to span length and honeycomb relative density. Beam specimens are tested in 3-point bending. The effect of honeycomb direction is also examined. The experimental data agree satisfactorily with the theoretical predictions. The results reveal the important role of core shear in a sandwich beam's bending behaviour and the need for a better understanding of indentation failure mechanism. High order sandwich beam theory (HOSBT) is implemented to extract useful information about the way that sandwich beams respond to localised loads under 3-point bending. 'High-order' or localised effects relate to the non-linear patterns of the in-plane and vertical displacements fields of the core through its height resulting from the unequal deformations in the loaded and unloaded skins. The localised effects are examined experimentally by Surface Displacement Analysis of video images recorded during 3-point bending tests. A new parameter based on the intrinsic material and geometric properties of a sandwich beam is introduced to characterise its susceptibility to localised effects. Skin flexural rigidity is shown to play a key role in determining the way that the top skin allows the external load to pass over the core. Furthermore, the contact stress distribution in the interface between the central roller and the top skin, and its importance to an indentation stress analysis, are investigated. To better model the failure in the core under the vicinity of localised loads, an Arcan- type test rig is used to test honeycomb cores under simultaneous compression and shear loading. The experimental measurements show a linear relationship between the out-of-plane compression and shear in honeycomb cores. This is used to derive a failure criterion for applied shear and compression, which is combined with the high order sandwich beam theory to predict failure caused by localised loads in sandwich beams made of GFRP laminate skins and Nomex honeycomb under 3-point bending loading. Short beam tests with three different indenter's size are performed on appropriately prepared specimens. Experiments validate the theoretical approach and reveal the nature of pre- and post-failure behaviour of these sandwich beams. HOSBT is used as a compact computational tool to reconstruct failure mode maps for sandwich panels. Superposition of weight and stiffness contours on these failure maps provide carpet plots for design optimisation procedures.

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ASCIONE, ALESSIA. "Synthetic models for the analysis and control of composite and sandwich aerospace structures in critical conditions". Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2751494.

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Isildak, Murat. "Use Of Helical Wire Core Truss Members In Space Structures". Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610553/index.pdf.

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In an effort to achieve lighter and more economical space structures, a new patented steel composite member has been suggested and used in the construction of some steel roof structures. This special element has a sandwich construction composed of some strips of steel plates placed longitudinally along a helical wire core. The function of the helical core is to transfer the shear between the flange plates and increase the sectional inertia of the resulting composite member by keeping the flange plates at a desired distance from each other. Because of the lack of research, design engineers usually treat such elements as a solid member as if it has a full shear transfer between the flanges. However, a detailed analysis shows that this is not a valid assumption and leads to very unsafe results. In this context, the purpose of this study is to investigate the behavior of such members under axial compression and determine their effective sectional flexural rigidity by taking into account the shear deformations. This study applies an analytical investigation to a specific form of such elements with four flange plates placed symmetrically around a helical wire core. Five independent parameters of such a member are selected for this purpose. These are the spiral core and core wire diameters, the pitch of the spiral core, and the flange plate dimensions. Elements with varying combinations of the selected parameters are first analyzed in detail by finite element method, and some design charts are generated for the determination of the effective sectional properties to be used in the structural analysis and the buckling loads. For this purpose, an alternative closed-form approximate analytical solution is also suggested.

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Maheri, M. R. "Vibration damping in composite/honeycomb sandwich beams". Thesis, University of Bristol, 1991. http://hdl.handle.net/1983/d96ba3e9-edb0-4a07-ac6e-69328ed22678.

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Joshi, Ninad Milind. "Study of the Effect of Unidirectional Carbon Fiber in Hybrid Glass Fiber / Carbon Fiber Sandwich Box Beams". University of Dayton / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1386188162.

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Frieda, Jan. "Administrativní budova". Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226910.

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This thesis aims to design a bearing composite steel structure for five-storey administration building with ground plan dimensions 35,00 x 50,00 m. Designed building has L-shaped plan, flat roof and attic all the way around. The largest part of the plan area occupies office zone with dimensions of 48,60 x 18,90 m. Contiguous zone communication and sanitation has dimensions of 13,50 x 15,90 m. Floor height is designed 3,60 m, the total height of the building is 18,70 m. Composite steel floor structure consists of transverse primary beams and hinge-connected secondary beams. Integrated formwork (trapezoidal sheet) has ribs oriented perpendicular to the secondary beams. Coupling is bidirectional. Construction will be done in two variants. Variant No.1 assumes primary and secondary beams (at the columns) hinge-connected with columns. In variant No.2 will be frame connection between primary beams and columns and together they will create 2D transverse frames with hinge-connected secondary beams. The supporting structure of the roof is designed similarly to ceiling, but reinforced concrete slab will be replaced with bracing in the roof plane and self-bearing rib sandwich panels. Vertical sheathing of the building provide sandwich panels and strip windows. The type of steel is S355. The building is designed for the site Hradec Králové. Standards and documents used in design of the bearing structure are included in the list of sources. The result of this work is a static analysis with an assessment of all elements of the selected (best) variant of the structure, drawing documentation and technical report.

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Książki na temat "Sandwich composite beam"

Center, Langley Research, red. A higher-order bending theory for laminated composite and sandwich beams. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1997.

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Center, Langley Research, red. A higher-order bending theory for laminated composite and sandwich beams. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1997.

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Keller, Thomas. Use of fibre reinforced polymers in bridge construction. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2003. http://dx.doi.org/10.2749/sed007.

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The aim of the present Structural Engineering Document, a state-of-the-art report, is to review the progress made worldwide in the use of fibre reinforced polymers as structural components in bridges until the end of the year 2000. Due to their advantageous material properties such as high specific strength, a large tolerance for frost and de-icing salts and, furthermore, short installation times with minimum traffic interference, fibre reinforced polymers have matured to become valuable alternative building materials for bridge structures. Today, fibre reinforced polymers are manufactured industrially to semi-finished products and ccimplete structural components, which can be easily and quickly installed or erected on site. Examples of semi-finished products and structural components available are flexible tension elements, profiles stiff in bending and sandwich panels. As tension elements, especially for the purpose of strengthening, strips and sheets are available, as weil as reinforcing bars for concrete reinforcement and prestressing members for internal prestressing or external use. Profiles are available for beams and columns, and sandwich constructions especially for bridge decks. During the manufacture of the structural components fibre-optic sensors for continuous monitoring can be integrated in the materials. Adhesives are being used more and more for joining components. Fibre reinforced polymers have been used in bridge construction since the mid-1980s, mostly for the strengthening of existing structures, and increasingly since the mid-1990s as pilot projects for new structures. In the case of new structures, three basic types of applications can be distinguished: concrete reinforcement, new hybrid structures in combination with traditional construction materials, and all-composite applications, in which the new materials are used exclusively. This Structural Engineering Document also includes application and research recommendations with particular reference to Switzerland. This book is aimed at both students and practising engineers, working in the field of fibre reinforced polymers, bridge design, construction, repair and strengthening.

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National Aeronautics and Space Administration (NASA) Staff. Higher-Order Bending Theory for Laminated Composite and Sandwich Beams. Independently Published, 2018.

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A higher-order bending theory for laminated composite and sandwich beams. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1997.

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A higher-order bending theory for laminated composite and sandwich beams. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1997.

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Części książek na temat "Sandwich composite beam"

Rodcheuy, Nunthadech, i George A. Kardomateas. "Concentrated Load Impulse Response of a Sandwich Beam/Wide Plate: Dynamic Elasticity and Extended High Order Sandwich Panel Theory Solutions". W Blast Mitigation Strategies in Marine Composite and Sandwich Structures, 97–117. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7170-6_5.

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Osman, Ashraf, i Khaled Galal. "Evaluation of Different CFRP Sandwich Deck Cores of Deployable Treadway Bridge Beam". W 8th International Conference on Advanced Composite Materials in Bridges and Structures, 469–79. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09632-7_54.

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Jonna, Naresh, i J. Srinivas. "Optimum Design of Tapered Laminated Composite Sandwich Beam Using Teaching–Learning-Based Algorithm". W Advanced Engineering Optimization Through Intelligent Techniques, 175–83. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-9285-8_17.

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Vinson, Jack R. "Use of Minimum Potential Energy to Analyze a Piezoelectric Beam". W Plate and Panel Structures of Isotropic, Composite and Piezoelectric Materials, Including Sandwich Construction, 389–93. Dordrecht: Springer Netherlands, 2005. http://dx.doi.org/10.1007/1-4020-3111-4_20.

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Daniel, I. M., E. E. Gdoutos, J. L. Abot i K. A. Wang. "Core Failure of Sandwich Beams". W Recent Advances in Composite Materials, 279–90. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-2852-2_23.

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Heinisuo, M. T., S. J. Malmi i A. I. J. Möttönen. "Exact Finite Element Method for Sandwich Beams". W Composite Structures 4, 536–54. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3455-9_42.

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Daniel, Isaac M., i Emmanuel E. Gdoutos. "Failure Modes of Composite Sandwich Beams". W Major Accomplishments in Composite Materials and Sandwich Structures, 197–227. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-3141-9_9.

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Fages, A., i G. Verchery. "Transverse Shear Influence on Calculus of Natural Frequencies of Sandwich Beams". W Composite Structures 3, 643–59. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-4952-2_46.

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Carlsson, L. A., i G. A. Kardomateas. "First-Order Shear Analysis of Sandwich Beams". W Structural and Failure Mechanics of Sandwich Composites, 85–101. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-1-4020-3225-7_4.

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Manalo, Allan, Thiru Aravinthan i Warna Karunasena. "Shear Behavior of Glue-Laminated Composite Sandwich Beams". W Advances in FRP Composites in Civil Engineering, 139–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17487-2_29.

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Streszczenia konferencji na temat "Sandwich composite beam"

Alam, Shah, i Guoqiang Li. "A Study of Hybrid Composite Sandwich Beam". W ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11845.

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Abstract This study presents the testing and numerical modeling results of composite sandwich beams. The sandwich beams are constructed from balsa wood in the core and high strength steel wire and E-glass fiber reinforced polymer composite in the facings. The testing of these beams is performed using a monotonic static four-point loading to failure in accordance with ASTM C393-00. Local strain distribution in the mid-span of the beams is obtained using strain gauges. Mid-span deflections of the beams are real-time measured using linear variable displacement transducer (LVDT). From the experimental results, flexural properties of the beams are calculated, including bending stiffness, bending strength, core shear strength, and facing modulus, core modulus, etc. The experimental results have shown that the beams have all failed in the compression zone by local buckling of the top face and shear of the core. The bottom skin does not exhibit any type of premature failure or distress. No bond failure of the composite in the tension zone is observed in any of the tested beams. Finite element modeling of the beam has been conducted using ANSYS. The mechanical properties of the skin and core material used in finite element modeling have been determined by testing of coupons. The predicted results are compared to experimental results, with a reasonable agreement.

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Daniel, Isaac M., i R. A. Jandro Abot. "Fabrication, Testing and Analysis of Composite Sandwich Structures". W ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-1206.

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Abstract The objective of this work was to study the behavior of composite sandwich structures and develop simple models to explain this behavior as a function of material, geometric and loading parameters. The scope of the study consists of mechanical characterization of the sandwich constituent materials, i. e., composite facings, honeycomb or foam cores, and adhesive layers; fabrication and testing of sandwich beams in pure bending; identification and recording of failure mechanisms by direct observation and nondestructive evaluation; and comparison of observed deformation and failure behavior with analytical predictions. Sandwich beams were fabricated by bonding carbon/epoxy (AS4/3501-6) facings to an aluminum honeycomb core with FM 73 film adhesive. Special techniques were developed to prevent premature failures under the loads and in the core and to insure failure in the test section under pure bending. Strains to failure in the facings were recorded with strain gages, and beam deflections and core strains were recorded with Moire techniques. The beam facings displayed characteristic nonlinearities for the composite material used, a softening nonlinearity on the compression side and a stiffening one on the tension side. These nonlinearities appear more pronounced than in the case of monotonic axial loadings of the composite material alone. The linear response of the beam is perfectly described by a simple bending model neglecting the contribution of the core, however, the more pronounced nonlinear behavior requires more accurate characterization of the core and adhesive materials separately, and more refined modeling.

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Ahobal, N., Lakshmi Pathi Jakkampatti, Saktivel Gnanasekaran, Jegadeeshwaran Rakkiannan, Raghukiran Nadimpali i Yogesh Jayant Bhalerao. "Dynamic analysis of hybrid MR elastomer sandwich composite beam". W SECOND INTERNATIONAL VIRTUAL CONFERENCE ON INTELLIGENT ROBOTICS, MECHATRONICS AND AUTOMATION SYSTEMS (IRMAS2022): Theme: Innovation towards Automated Future. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0148642.

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Dawood, Tariq A., R. A. Shenoi, Sandor M. Veres, Melin Sahin i Mark J. Gunning. "Damage detection in a sandwich composite beam using wavelet transforms". W Smart Structures and Materials, redaktor Ralph C. Smith. SPIE, 2003. http://dx.doi.org/10.1117/12.482823.

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Ayorinde, Emmanuel O., Ronald F. Gibson i Feizhong Deng. "Some Results and Issues in the Non-Destructive Evaluation of Sandwich Composite Structures". W ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/amd-25429.

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Abstract This paper focuses on the use of basic NDE methods like ultrasonics, imaging and vibration testing to assess the integrity of some sandwich composites which have been subjected to transverse loading. Samples of a foam core, glass composite facing sandwich beam of varying thicknesses and end notch lengths were tested in three point bending and assessed by these NDE methods. The results show that core shear and indentation failures appear to be the prominent failure modes for these geometries and materials, and that changes in the damping and vibration modal frequencies of the beams can indicate damage states.

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Sadeghnejad, Soroush, Mojtaba Sadighi i Abdolreza Ohadi Hamedani. "An Extended Higher-Order Free Vibration Analysis of Composite Sandwich Beam With Viscoelastic Core". W ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82686.

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Free vibration analysis of sandwich beam with a viscoelastic core based on the extended high-order sandwich panel theory approach is presented. The effects of transverse shear and core compressibility are of high importance in sandwich structures, having an influence on the entire structural behavior especially in vibrations. For applications involving stiffer cores, the high-order sandwich panel theory (HSAPT) cannot accurately predict the shear and axial stress distributions in the core. Thus, by using the “Extended High-Order Sandwich Panel Theory” (EHSAPT), the in-plane rigidity of the core is considered in addition to the compressibility of the core in the transverse direction. The novelty of this theory is that it allows for three generalized coordinates in the core (the axial and transverse displacements at the centroid of the core, and the rotation at the centroid of the core) instead of just one (mid-point transverse displacement) commonly adopted in other available theories. The mathematical formulation uses the Hamilton principle and includes derivation of the governing equations along with the appropriate boundary conditions. The formulation uses the classical thin plate theory for the face sheets and a two-dimensional elasticity theory or equivalent one for the core. In addition, Young modulus, rotational inertia, and kinetic energy of the core are considered and core is assumed as an orthotropic viscoelastic material. The analysis is applicable for any types of loading scheme, localized as well as distributed, and distinguish between loads applied at the upper or the lower face. The obtained results are compared with recent research published by the present authors which was done numerically by using FEM on viscoelastic sandwich beam and the corresponding results of other previous researches. The influence of material properties, face layup and geometry effect on natural frequencies of composite sandwich beams are investigated.

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Steeves, Craig A., i Norman A. Fleck. "Failure Modes in Sandwich Beams With Composite Face-Sheets and PVC Foam Cores". W ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-2021.

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Abstract Sandwich beams with glass-fibre reinforced plastic faces and PVC foam cores were manufactured and tested in three point bending. The experiments were compared with analytical predictions of beam behaviour for three failure modes: face microbuckling, core shear collapse, and local indentation. A new model for indentation failure was developed which gives accurate predictions for ultimate strengths of sandwich beams that fail due to indentation.

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Şener, Özgün, Oğuzhan Dede, Oğuz Atalay, Mert Atasoy i Altan Kayran. "Evaluation of Transverse Shear Moduli of Composite Sandwich Beams Through Three-Point Bending Tests". W ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87636.

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Transverse shear moduli of the sandwich core and flexural stiffness of all-composite sandwich constructions are determined with three-point beam bending tests, and compared with the analytical and finite element analysis solutions. Additionally, Digital Image Correlation (DIC) system is employed to validate the experimental results by monitoring the displacements. The effect of orientation of the composite core material with respect to the beam axis on the shear modulus of the core material itself, flexural stiffness of the sandwich beam, maximum loading, and the maximum stresses on the sandwich panel are also examined. Comparable results are achieved through experiments, finite element and analytical analyses.

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Vinson, Jack R. "On the Optimization of Composite Cylindrical Sandwich Shells Subjected to Beam Type Bending". W ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0738.

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Abstract Sandwich construction offers several advantages over monocoque and various discretely stiffened structures. These include greater load carrying ability, reduced weight, higher buckling loads and higher fundamental natural frequencies. The equations for the analysis and design of sandwich cylindrical shells subjected to beam type bending are presented herein. These equations are then manipulated to provide the face thickness, core depth, and core shear modulus to produce a minimum weight structure for a given load index and face material system. A factor of merit to select the best face material is also presented. As examples, Carbon/epoxy and E-glass/epoxy cross-ply composite faced sandwich shells are compared, as well as comparison with a monocoque cross-ply laminated shell.

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Farzaneh Joubaneh, Eshagh, i Jihong Ma. "Dynamics of Periodic Sandwich Beams". W ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-94730.

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Abstract Sandwich beams are commonly used in vibration absorption applications due to their inherent properties. To further mitigate vibration, metamaterials with periodic properties or periodic resonators are widely incorporated as composite cores to create phonon bandgaps in sandwich beams. However, the effect of periodicity in face sheets of the sandwich beam has been sporadically explored. This paper parametrically investigates the effect of the subunit cell size and different periodicity for top and bottom face sheets on opening bandgaps that can filter transverse and longitudinal waves individually or simultaneously. Structures can be protected from both transverse and longitudinal waves using such mechanisms by enhancing the coupling effect between transverse and longitudinal modes within sandwich structure.

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