Journal articles: 'Composite and sandwich plate'

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Liu, Xiaoyan, Jiacheng Wu, Jiaojiao Xi, and Zhiqiang Yu. "Bonded Repair Optimization of Cracked Aluminum Alloy Plate by Microwave Cured Carbon-Aramid Fiber/Epoxy Sandwich Composite Patch." Materials 12, no. 10 (May 21, 2019): 1655. http://dx.doi.org/10.3390/ma12101655.

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Fiber-reinforced epoxy sandwich composites, which were designed as the bonded repair patches to better recover the mechanical performance of a central cracked aluminum alloy plate, were layered by carbon and aramid fiber layers jointly and cured by microwave method in this study. The static tensile and bending properties of both carbon-aramid fiber/epoxy sandwich composite patches and the cracked aluminum alloy plates after bonded repair were systematically investigated. By comparing the mechanical performance with traditional single carbon-fiber-reinforced composite patches, it can be found that the bending performance of carbon-aramid fiber sandwich composite patches was effectively improved after incorporation of flexible aramid fiber layers into the carbon fiber layers, but the tensile strength of sandwich composite patches was weakened to some extent. Especially, the sandwich patches with 3 fiber layers exhibited better tensile and bending performance in comparison to patches of 5 and 7 fiber layers. The optimized 3-layer carbon-aramid fiber sandwich patch repaired plate recovered 86% and 190% of the tensile and bending performance in comparison to the uncracked ones, respectively, showing a considerable repair majorization effect for the cracked aluminum alloy plate.

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Satour, A., F. Boubenider, Ali Badidi Bouda, and Rachid Halimi. "Use of Guided Waves for Inspection of Composite Skin-Honeycomb Core." Materials Science Forum 636-637 (January 2010): 1533–40. http://dx.doi.org/10.4028/www.scientific.net/msf.636-637.1533.

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Sandwich plates, made of two aluminum layers and a metal honey comb core are used in the aircraft industry. The purpose of this study is to show the ultrasonic guided waves sensibility to discover delamination in skin-honeycomb sandwich structures used in aeronautics. Separation between the skin and the core can appear during the manufacture or after use. In this work, Lamb's waves are used to control this kind of plane structure. Indeed, these waves have the advantage to put in vibration the totality of the plate that we want to control and they propagate on long distances without too much attenuation. The revealing, by the guided waves, of the unsticking which can meet on such sandwiches, between the plate and the honeycomb core is studied and commented.

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Al-Waily, Muhannad, Hussam Raad, and Emad Kadum Njim. "Free Vibration Analysis of Sandwich Plate-Reinforced Foam Core Adopting Micro Aluminum Powder." Physics and Chemistry of Solid State 23, no. 4 (November 30, 2022): 659–68. http://dx.doi.org/10.15330/pcss.23.4.659-668.

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Analytical study of free vibration behavior of foam core sandwich plates strengthened with Aluminum micro spherical powder were presented in this paper. Sandwich plate with polyurethane foam core sandwiched between two Aluminum faces. To calculate the natural frequencies, use Kirchhoff theory to drive the equation of sandwich plate vibration. The stiffness characteristics of a foam-Aluminum core were evaluated by micro particle composite equations. The findings reveal that the impact of filling foam is effective, according to the free vibration analysis, the sandwich plate's free vibration and static behavior can be improved by using micro spherical powder foam in the vacant spherical gaps of the foam core. In comparison to other cores, the core foam-aluminum sandwich plate deflects less.

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Huang, Yizhe, Lin Li, Zhichao Xu, Chaopeng Li, and Kuanmin Mao. "Free Vibration Analysis of Functionally Gradient Sandwich Composite Plate Embedded SMA Wires in Surface Layer." Applied Sciences 10, no. 11 (June 5, 2020): 3921. http://dx.doi.org/10.3390/app10113921.

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In this paper, a new type of composite gradient sandwich plate structure is proposed, which embeds the pre-strained shape memory alloy (SMA) into the surface layer and the core layer composed of epoxy resin and graphite-reinforced materials. In the core layer, graphite-reinforced material has a continuous gradient distribution along the thickness direction of the sandwich plate. Dynamic behavior of composite gradient sandwich plate in thermal environment is investigated. The equations of motion and frequency equation are derived based on the Reddy shear deformation theory and the constitutive equation for a composite sandwich plate, via the Hamilton principle. Some analytical study is depicted to provide an insight into the effects of volume fraction of material composition, gradient distribution of graphite in the core layer, and pre-strain of SMA in the surface layer on the dynamic behavior of a sandwich composite plate. This study investigates the modal performance of a sandwich composite plate with two aspects, a gradient core layer of graphite-reinforced material and surface layer-embedded SMA wires, which provide a new design idea for dynamic behavior of sandwich plates.

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Basa, B., and Saroj K. Sarangi. "Vibration Control of Sandwich Plates." Applied Mechanics and Materials 612 (August 2014): 1–7. http://dx.doi.org/10.4028/www.scientific.net/amm.612.1.

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This paper presents the active control of vibrations of sandwich plates using piezoelectric composites (PZC). The top surface of the plate is integrated with the patches of active constrained layer damping treatment. Active fiber composite, one of the commercially available PZCs, is used as the material of the constraining layer of the patches and the constrained layer of the patch is composed of a viscoelastic material. Considering the ﬁrst order shear deformation theory individually for each layer of the sandwich plate, a three-dimensional finite element model has been developed. The performance of active fiber composite for the smart vibration control of the sandwich plates has been studied and numerical results are presented. Emphasis has also been placed on investigating the effect of variation of piezoelectric ﬁber orientation angle in the constraining layer on the control authority of the patches.

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Basa, B., S. Das, and Saroj K. Sarangi. "Geometrically Nonlinear Analysis of Smart Sandwich Plates." Applied Mechanics and Materials 813-814 (November 2015): 1085–89. http://dx.doi.org/10.4028/www.scientific.net/amm.813-814.1085.

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This paper presents the geometrically nonlinear analysis of smart sandwich plates. The top surface of the plate is integrated with a layer of commercially available active fiber composite. Considering the First order shear deformation theory individually for each layer of the sandwich plate, a three-dimensional finite element model has been developed. The performance of active fiber composite for the smart control of geometrically nonlinear deflection of the sandwich plates has been studied and numerical results are presented.

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Vemuluri, Ramesh Babu, Vasudevan Rajamohan, and Ananda Babu Arumugam. "Dynamic characterization of tapered laminated composite sandwich plates partially treated with magnetorheological elastomer." Journal of Sandwich Structures & Materials 20, no. 3 (June 3, 2016): 308–50. http://dx.doi.org/10.1177/1099636216652573.

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This study investigates the dynamic performance of the partially treated magnetorheological elastomer tapered composite sandwich plates. Various partially treated tapered magnetorheological elastomer laminated composite sandwich plate models are formulated by dropping-off the plies longitudinally in top and bottom composite face layers to yield tapered plates as the face layers. The uniform rubber and magnetorheological elastomer materials are considered as the core layer. The governing differential equations of motion of the various partially treated magnetorheological elastomer tapered composite sandwich plate configurations are derived using classical laminated plate theory and solved numerically. Further, silicon-based magnetorheological elastomer and natural rubber are being fabricated and tested to identify the various mechanical properties. The effectiveness of the developed finite element formulation is demonstrated by comparing the results obtained with experimental tests and available literature. Also, various partially treated magnetorheological elastomer tapered laminated composite sandwich plates are considered to the study the effect of location and size of magnetorheological elastomer segment on various dynamic properties under various boundary conditions. The effects of magnetic field on the variation of natural frequencies and loss factors of the various partially treated magnetorheological elastomer tapered laminated composite sandwich plate configurations are analysed at different boundary conditions. Also, the effect of taper angle of top and bottom layers, aspect ratio, ply orientations on the natural frequencies of different configurations are analysed. Further, the transverse vibration responses of three different partially treated magnetorheological elastomer tapered laminated composite sandwich plate configurations under harmonic excitation are analysed at various magnetic fields. This analysis suggests that the location and size of the magnetorheological elastomer segments strongly influence the natural frequency, loss factor and transverse displacements of the partially treated magnetorheological elastomer tapered laminated composite sandwich plates apart from the intensities of the applied magnetic field. This shows the applicability of partial treatment to critical components of a large structure to achieve a more efficient and compact vibration control mechanism with variable damping.

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Praveen A, Paul, Vasudevan Rajamohan, Ananda Babu Arumugam, and Arun Tom Mathew. "Vibration analysis of a multifunctional hybrid composite honeycomb sandwich plate." Journal of Sandwich Structures & Materials 22, no. 8 (December 26, 2018): 2818–60. http://dx.doi.org/10.1177/1099636218820764.

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In the present study, the free and forced vibration responses of the composite sandwich plate with carbon nanotube reinforced honeycomb as the core material and laminated composite plates as the top and bottom face sheets are investigated. The governing equations of motion of hybrid composite honeycomb sandwich plates are derived using higher order shear deformation theory and solved numerically using a four-noded rectangular finite element with nine degrees of freedom at each node. Further, various elastic properties of honeycomb core materials with and without reinforcement of carbon nanotube and face materials are evaluated experimentally using the alternative dynamic approach. The effectiveness of the finite element formulation is demonstrated by performing the results evaluated experimentally on a prototype composite sandwich plate with and without carbon nanotube reinforcement in core material. Various parametric studies are performed numerically to study the effects of carbon nanotube wt% in core material, core thickness, ply orientations, and various boundary conditions on the dynamic properties of composite honeycomb sandwich plate. Further, the transverse vibration responses of hybrid composite sandwich plates under harmonic force excitation are analyzed at various wt% of carbon nanotubes and the results are compared with those obtained without addition of carbon nanotubes to demonstrate the effectiveness of carbon nanotube reinforcement in enhancing the stiffness and damping characteristics of the structures. The study provides the guidelines for the designer on enhancing both the stiffness and damping properties of sandwich structures through carbon nanotube reinforcement in core materials.

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Draoui, Aicha, Mohamed Zidour, Abdelouahed Tounsi, and Belkacem Adim. "Static and Dynamic Behavior of Nanotubes-Reinforced Sandwich Plates Using (FSDT)." Journal of Nano Research 57 (April 2019): 117–35. http://dx.doi.org/10.4028/www.scientific.net/jnanor.57.117.

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Based on the first order shear deformation plate theory (FSDT) in the present studie, static and dynamic behavior of carbon nanotube-reinforced composite sandwich plates has been analysed. Two types of sandwich plates, namely, the sandwich with face sheet reinforced and homogeneous core and the sandwich with homogeneous face sheet and reinforced core are considered. The face sheet or core plates are reinforced by single-walled carbon nanotubes with two types of distributions of uniaxially aligned reinforcement material which uniformly (UD-CNT) and functionally graded (FG-CNT). The analytical equations are derived and the exact solutions for bending and vibration analyses of such type’s plates are obtained. The mathematical models provided and the present solutions are numerically validated by comparison with some available results in the literature. Inﬂuence of Various parameters of reinforced sandwich plates such as aspect ratios, volume fraction, types of reinforcement and plate thickness on the bending and vibration analyses of carbon nanotube-reinforced composite sandwich plates are studied and discussed. The findings suggest that the (FG-CNT) face sheet reinforced sandwich plate has a high resistance against deflections compared to other types of reinforcement. It is also revealed that the reduction in the dimensionless natural frequency is most pronounced in core reinforced sandwich plate.

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Yartsev, Boris, Viktor Ryabov, and Lyudmila Parshina. "Dissipative properties of composite structures. 1. Statement of problem." Transactions of the Krylov State Research Centre 4, no. 398 (November 15, 2021): 24–34. http://dx.doi.org/10.24937/2542-2324-2021-4-398-24-34.

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Object and purpose of research. The object under study is a sandwich plate with two rigid anisotropic layers and a filler of soft isotropic viscoelastic polymer. Each rigid layer is an anisotropic structure formed by a finite number of orthotropic viscoelastic composite plies of arbitrary orientation. The purpose is to develop a mathematical model of sandwich plate. Materials and methods. The mathematical model of sandwich plate decaying oscillations is based on Hamilton variational principle, Bolotin’s theory of multilayer structures, improved theory of the first order plates (Reissner-Mindlin theory), complex modulus model and principle of elastic-viscoelastic correspondence in the linear theory of viscoelasticity. In description of physical relations for rigid layers the effects of oscillation frequencies and ambient temperature are considered as negligible, while for the soft viscoelastic polymer layer the temperaturefrequency relation of elastic-dissipative characteristics are taken into account based on experimentally obtained generalized curves. Main results. Minimization of the Hamilton functional makes it possible to reduce the problem of decaying oscillations of anisotropic sandwich plate to the algebraic problem of complex eigenvalues. As a specific case of the general problem, the equations of decaying longitudinal and transversal oscillations are obtained for the globally orthotropic sandwich rod by neglecting deformations of middle surfaces of rigid layers in one of the sandwich plate rigid layer axes directions. Conclusions. The paper will be followed by description of a numerical method used to solve the problem of decaying oscillations of anisotropic sandwich plate, estimations of its convergence and reliability are given, as well as the results of numerical experiments are presented.

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Zhang, Guo Li, Ya Nan Wang, Jia Lu Li, Guang Wei Chen, Li Chen, and Fu You Wang. "The Effect of Reinforcement Structure on the Modal Parameters for Sandwich Structure Composite Plate." Advanced Materials Research 194-196 (February 2011): 2420–24. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.2420.

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In order to investigate the effect of different reinforcement structure on the dynamic characteristics of sandwich structure composite plates used for manufacturing the high speed reciprocating motion composite components, four kinds of paulownia wood sandwich composite test specimens with dimensions of 350×83.5×9.5mm was designed and made by hand lay-up performing and press molding technology. The woven and 2D braiding fabric prepreg were both selected as top face and inner face materials , respectively, and the carbon fiber woven fabric prepreg was chosen as inner part materials. According to the impulse response modal test method, a modal test system was established. It was found that this kind of sandwich structure composite plate has bigger natural frequency value, it’s minimum natural frequency was about 609.77Hz that could meet the requirement for high speed reciprocating motion parts. The dynamic test results shown that the natural frequency of F2BAF-IUC-CPW sample is higher t about 11.17% at least, selecting 2D integral braiding pipe fabric as top face and inner face reinforced materials could effectively improve the dynamic properties of sandwich composite rectangular plates. The modal experiments indicated that the modal shapes of sandwich composite plate specimen with four kind reinforcement structures were identical, it’s 1st modal shape, 2nd modal shape and 3rd modal shape presented torsional vibration shape, flexural vibration shape and torsional flexural vibration shape, separately, the modal shapes of sandwich composite plate specimen were not obviously affected by reinforcement structure.

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12

Hsu, Yao. "Numerical Analysis on Failure Behavior of Composite Sandwich Plate." Applied Mechanics and Materials 284-287 (January 2013): 178–82. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.178.

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The Composite sandwich plate is made of two laminated face-sheets and one core material. Since such a kind of structure has many advantages, they have been widely used in structural manufacturing industry. However, when sandwich plates are impacted by transverse loadings, damages that are usually invisible would occur inside the sandwich plate and those damages would potentially reduce the structural safety. Therefore, it is necessary to elucidate the failure mechanism and how they affect the failure behaviors of sandwich structures for safety purpose. To this end, the present study is to investigate the impact failure behaviors of sandwich plates subjected to a rigid spherical impactor. Numerical simulation approach is carried out by finite element method. To predict the initial failure, several failure criteria to face-sheets and core material are proposed. In addition, to further simulate the progressive failure behaviors, a stiffness modification method is proposed and incorporated into the finite element software. The analytical results show that the local failure including fiber breakages, delamination, core cracking and plasticity is the main failure mechanism of cases studied. Furthermore, parametric study is also conducted and discussed in the paper.

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Zhang, Guo Li, Ya Nan Wang, Jia Lu Li, Guang Wei Chen, Li Chen, and Fu You Wang. "The Theoretical Prediction and Experimental Verification of Modal Parameters for Carbon Fiber Reinforced Composites with Sandwich Structure." Advanced Materials Research 194-196 (February 2011): 2415–19. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.2415.

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A innovative structure of sandwich composite rectangular plate with dimensions of 350 ×83.5×9.5mm was designed, it was made of unidirectional prepreg of carbon fibre and woven fabric prepreg of carbon fiber as face materials and paulownia as core material by hand lay-up performing and press molding technology for investigating the dynamic performance such as natural frequency and modal shapes. Based on testing the in-plane and out-plane mechanical properties of composite samples reinforced by unidirectional carbon fibre and carbon fiber woven fabric, a ANSYS FEA dynamic modeling was developed. According to the impulse response modal test method, a modal test system was established. The natural frequency test results showed that the minimum natural frequency of sandwich composite rectangular plate is about 616.45Hz which is higher about 27.5% than that of aluminum rectangular plate reinforced by carbon. The modal experiment indicated that the 1st modal shape, 2nd modal shape, 3rd modal shape and 4th modal shape of the sandwich composite rectangular plate were torsional vibration, flexural vibration shape, torsional flexural vibration and double-flexural vibration separately. It was found the calculating precision of FEA dynamic predication was very high, the dynamic predicating results by FEA could provide fundamental data to the optimal design high speed reciprocating sandwich composite rectangular parts.

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Dubey, Manish Kumar, and Satyajit Panda. "Shear actuation mechanism and shear-based actuation capability of an obliquely reinforced piezoelectric fibre composite in active control of annular plates." Journal of Intelligent Material Systems and Structures 30, no. 16 (July 23, 2019): 2447–63. http://dx.doi.org/10.1177/1045389x19862638.

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In this work, the mechanism of shear actuation and the shear mode actuation capability of an obliquely reinforced piezoelectric fibre composite are investigated in active control of annular plates. This piezoelectric fibre composite is capable of providing extensional and shear actuation forces in a transverse plane of its Cartesian material coordinate system, and these actuation forces are utilized for shear-based actuation of an annular plate by embedding the piezoelectric fibre composite patches at the core of the plate. First, the mechanism of shear actuation of the annular sandwich plate is analysed, and it mainly reveals an adverse effect of the coupling between the transverse normal strain and shear stresses on the shear actuation forces, even though a good shear-actuated bending deformation of the annular plate is observed. So, next, the effectiveness of the piezoelectric fibre composite patches in shear mode active control of flexural vibration of the annular sandwich plate is investigated, where a shear-based feedback control arrangement is proposed for effective active control of the plate according to the velocity feedback control law. The analysis reveals an indicative shear actuation capability of this obliquely reinforced piezoelectric fibre composite, and thus it may be a potential material for shear-based active control of vibration of annular plates.

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Shiau, L. C., and S. Y. Kuo. "Nonlinear Panel Flutter of Composite Sandwich Plates with Thermal Effect." Journal of Mechanics 24, no. 2 (June 2008): 179–88. http://dx.doi.org/10.1017/s1727719100002215.

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ABSTRACTBy considering the total transverse displacement of a sandwich plate as the sum of the displacement due to bending of the plate and that due to shear deformation of the core, a high precision higher order triangular plate element is developed for the nonlinear panel flutter analysis of thermally buckled sandwich plates. Von Karman large deformation assumptions and quasi-steady aerodynamic theory are employed for the analysis. Newmark numerical time integration method is applied to solve the nonlinear governing equations in time domain. Results show that temperature will increase both the maximum displacement and motion speed of the plate. But the maximum displacement and velocity of the plate will not vary much with the aerodynamic pressure. Buckle pattern change phenomenon occurred in some specific case will increase the flutter boundary and change the flutter motion type of the plate. Temperature gradient increases the overall stiffness of the plate, which in turn stabilizes the sandwich panel and increases the flutter boundary of the plate.

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Shiau, Le-Chung, and Shih-Yao Kuo. "Free Vibration of Thermally Buckled Composite Sandwich Plates." Journal of Vibration and Acoustics 128, no. 1 (June 3, 2005): 1–7. http://dx.doi.org/10.1115/1.2149388.

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A high precision triangular plate element is developed for the free vibration analysis of thermally buckled composite sandwich plates. Due to an uneven thermal expansion in the two principal material directions, the buckling mode of the plate may change from one pattern to another in the postbuckling region for certain fiber orientation and aspect ratio of the plate. Because of this buckle pattern change, the sequence of natural frequencies of the plate is also suddenly altered. By examining the buckling and free vibration modes of the plate, a clear picture of buckle pattern change and vibration mode shifting is presented. Numerical results show that if the shape of a free vibration mode is similar to the plate buckling mode then the natural frequency of that mode will drop to zero when the temperature reaches the buckling temperature.

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Katariya, Pankaj V., Subrata Kumar Panda, and Trupti Ranjan Mahapatra. "Bending and vibration analysis of skew sandwich plate." Aircraft Engineering and Aerospace Technology 90, no. 6 (September 3, 2018): 885–95. http://dx.doi.org/10.1108/aeat-05-2016-0087.

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Purpose The purpose of this paper is to develop a general mathematical model for the evaluation of the bending and vibration responses of the skew sandwich composite plate using higher-order shear deformation theory. The sandwich structural components are highly preferable in modern engineering application because of their desirable structural advantages despite the manufacturing and analysis complexities. The present model is developed to solve the bending and vibration problem of the skew sandwich composite plate with adequate accuracy numerically in the absence of the experimental analysis. Design/methodology/approach The skew sandwich composite plate structure is modelled in the present analysis by considering laminated face sheet in conjunction with isotropic and/or orthotropic core numerically with the help of the higher-order mathematical model. Further, the responses are computed numerically with the help of in-house computer code developed in matrix laboratory (MATLAB) environment in conjunction with finite element (FE) steps. The system governing equations are derived via variational technique for the computation of the static and the frequency responses. Findings The skew sandwich composite plate is investigated using the higher-order kinematic model where the transverse displacement through the thickness is considered to be linear. The convergence and the validation study of the bending and the frequency values of the sandwich structure indicate the necessary accuracy. Further, the current model has been used to highlight the applicability of the higher-order kinematics for the evaluation of the sandwich structural responses (frequency and static deflections) for different design parameters. Originality/value In the present paper, the bending and the vibration responses of the skew sandwich composite plate are analysed numerically using the equivalent single-layer higher-order kinematic theory for the isotropic and the orthotropic core numerically with the help of isoparametric FE steps. Finally, it is understood that the present model is capable of solving the sandwich structural responses with less computation cost and adequate accuracy.

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Ma, Ke Jian, Y. Q. Lu, J. C. Xiao, and H. G. Zhang. "Theory and Practice of New Types of Long-Span Building Structures Developed at Guizhou University." Key Engineering Materials 400-402 (October 2008): 17–25. http://dx.doi.org/10.4028/www.scientific.net/kem.400-402.17.

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This paper presents the theory and practice of new types of long-span building structures developed at Guizhou University for the recent 25 years. The new structural systems include RC open-web sandwich plate structures, steel/RC composite open-web sandwich plate structures, prestressed RC open-web sandwich plate structures, and cast-in-place concrete round eye hollow plate structures. The mechanical characters and technical indexes of each system are described. The application of the structures is detailed in tables and photos.

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Kheirikhah, Mohammad Mahdi, and Seyyed Mohammad Reza Khalili. "Bending Analysis of Composite Sandwich Plates with Flexible Core Using 3D Finite Element Method." Applied Mechanics and Materials 110-116 (October 2011): 1229–36. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.1229.

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Sandwich plates have been extensively used in many engineering applications such as automotive and aerospace. In the present paper, an accurate finite element model is presented for bending analysis of soft-core rectangular sandwich plates. The sandwich plate is composed of three layers: top and bottom skins and core layer. The core is assumed as a soft orthotropic material and skins are assumed generally unequal laminated composites. Finite element model of the problem has been constructed in the ANSYS 11.0 standard code area. Continuity conditions of transverse shear stresses at the interfaces are satisfied as well as the conditions of zero transverse shear stresses on the upper and lower surfaces of plate. Also transverse flexibility and transverse normal strain and stress of core are considered. The effect of geometrical parameters of the sandwich plate are studied. Comparison of the present results with those of plate theories confirms the accuracy of the proposed model.

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Hoseinzadeh, Mohammad, and Jalil Rezaeepazhand. "Dynamic stability enhancement of laminated composite sandwich plates using smart elastomer layer." Journal of Sandwich Structures & Materials 22, no. 8 (December 17, 2018): 2796–817. http://dx.doi.org/10.1177/1099636218819158.

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The dynamic stability of composite sandwich plates with a smart elastomer layer subjected to an axial periodic load is investigated. A finite element model of the composite sandwich plate with Magnetorheological elastomer (MRE) core is developed. A MRE layer, which its mechanical properties change with the applied magnetic field, is used as a damping layer to improve the stability of the structure. Due to the intrinsic characteristics of the MREs, these materials commonly operate in their pre-yield region. In this region, complex shear modulus is used for these materials. The effect of different parameters such as stacking sequences, boundary conditions, geometry of the sandwich plate, thickness and partial activation of the MRE layer on the damping treatment and stability boundaries is investigated. The presented results show that the application of an MRE layer as a core in the composite sandwich plate changes the stability region of the structure. Therefore, the instability boundaries can be manipulated to achieve the desired dynamic response of the structure.

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Singh, Sandeep, Jeeoot Singh, and Karunesh Kumar Shula. "Buckling of Laminated Composite and Sandwich Plates Using Radial Basis Function Collocations." International Journal of Structural Stability and Dynamics 15, no. 01 (January 2015): 1540002. http://dx.doi.org/10.1142/s0219455415400027.

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In this paper, buckling analysis of isotropic, orthotropic, laminated composite and sandwich plates utilizing trigonometric shear deformation theory and meshless method based on the finite point formulation using thin plate, polynomial and inverse multiquadric radial basis function is presented. The convergence of the present method is studied for isotropic and laminated composite plates for different radial basis functions with optimal value of shape parameter. Numerical examples of laminated and sandwich plates subjected to various types of in-plane loads are solved to demonstrate accuracy and applicability of present method. Several new results for variety of composite and sandwich plates are presented. The present results are observed to be in good agreement with those available in literature. The effects of orthotropy ratio of material, span to thickness ratio, number of layers, core thickness and lamination scheme on the critical load of plates are also presented.

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Zu, Xu Dong, Zheng Xiang Huang, Qiang Qiang Xiao, and Ming Xia. "Polyethylene Rubber Composite Target Resistance to Jet Penetration." Advanced Materials Research 79-82 (August 2009): 1217–20. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1217.

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A “sandwich-style” composite target with a 45 steel surface plate, polyethylene rubber sandwich plate, and 45 steel back plate is studied for jet penetration resistance. The effects of varying layer thickness are analyzed using AUTODYN software and energy-thickness (E-T) curves in Matlab. The influence of the scale effect on each of these composite layers is analyzed. Results from the E-T curves confirm that varying the thickness of the 45 steel back plate has an obvious influence on jet penetration resistance. Moreover, varying the thickness of the front plate and the sandwich plate has a large effect on jet fracture after penetration of the composite target. Experiments prove that the results of the simulation are correct, and that the scale effect is present for these composite targets under jet penetration.

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Yartsev, B. A., V. M. Ryabov, and L. V. Parshina. "Dissipative properties of three-layered composite structures. 3. Objects of study." Transactions of the Krylov State Research Centre 2, no. 400 (May 16, 2022): 51–58. http://dx.doi.org/10.24937/2542-2324-2022-2-400-51-58.

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Object and purpose of research. The object of research is a sandwich plate formed by two rigid anisotropic layers and a soft isotropic layer of viscoelastic polymer in the middle. Each rigid layer is an anisotropic structure formed by a finite number of arbitrary oriented orthotropic viscoelastic layers of composites. The purpose of work is to choose the objects of research demonstrating main features of parameters of natural decaying oscillation of sandwich plates. Materials and methods. Qualitative analysis of differential equations describing decaying oscillations of anisotropic plates of various compositions and reinforcement structures. Main results. The main objects of research are two special reinforcement structures of rigid layers made up of unidirectional CFRP layers: symmetric and asymmetric structures. The symmetric reinforcement structure of rigid layers is formed by an assembly of unidirectional CFRP layers with the same orientation relative to the global axes of these layers. In the asymmetric structures the unidirectional CFRP layers are oriented in the opposite directions with respect to the global axes of the rigid layers. Results of numerical modeling of quasi-homogeneous monocline plate dynamic response are given. It is shown that coupled oscillations of the symmetric sandwich plate are described by two systems of differential equations similar to the equation systems that describe decaying oscillations of quasi-homogeneous monocline plate. While the coupled oscillations of the asymmetric sandwich plate are described by two systems of differential equations coinciding with the systems of differential equations describing decaying oscillations of globally orthotropic sandwich plate. Conclusion. Further to this paper, discussion of numerical experiments on chosen objects of research will be given.

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Kheirikhah, Mohammad Mahdi, Seyyed Mohammad Reza Khalili, and Keramat Malekzadeh Fard. "Buckling Analysis of Soft-Core Composite Sandwich Plates Using 3D Finite Element Method." Applied Mechanics and Materials 105-107 (September 2011): 1768–72. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.1768.

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In the present paper, an accurate 3D finite element model is presented for bucking analysis of soft-core rectangular sandwich plates. The sandwich plate is composed of three layers: top and bottom skins and core layer. Finite element model of the problem has been constructed in the ANSYS 11.0 standard code area. The effect of geometrical parameters of the sandwich plate is studied. Comparison of the present results with those of plate theories confirms the accuracy of the proposed model. The overall buckling loads calculated by FE model are higher than that of the accurate results and the maximum discrepancy is less than 10 percent.

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Rotaru, Florentina, Ionel Chirica, and Elena Felicia Beznea. "Influence of the Honeycomb Geometry on the Sandwich Composite Plate Behavior." Advanced Materials Research 1143 (February 2017): 139–44. http://dx.doi.org/10.4028/www.scientific.net/amr.1143.139.

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In this paper the influence cell honeycomb geometry on the mechanical behaviour of a composite sandwich plate is analyzed. Three cell geometries (circular, hexagonal and square) are static analysed so that to select the best type of honeycomb that will be used in the manufacturing the sandwich plate core. The main aim is to develop approach models of equivalent orthotropic materials to replace the real model of honeycomb core with their properties so that to quickly calculate the sandwich plate made out of composite when is used a finite element analysis code. Geometry and material properties of the honeycomb are delivered by the material provider. Comparative analysis, by using Finite element analysis is performed for all geometries, in the same boundary conditions. Since in the impact loading of the composite sandwich plate the core is mainly loaded to compression, comparative study of the three cell geometries honeycomb was performed for this type of compressive loading. Since the cell is the basic element of the honeycomb core, the calculus is performed for one unit volume of sandwich, concerning also the part of skins.

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Nguyen, Duc Dinh, and Cong Hong Pham. "Nonlinear dynamic response and vibration of sandwich composite plates with negative Poisson’s ratio in auxetic honeycombs." Journal of Sandwich Structures & Materials 20, no. 6 (December 5, 2016): 692–717. http://dx.doi.org/10.1177/1099636216674729.

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Auxetic cellular solids in the forms of honeycombs under blast load have great potential in a diverse range of applications, including core material in sandwich plates composite components. Based on Reddy’s first-order shear deformation plate theory, this paper presents an analysis of the nonlinear dynamic response and vibration of sandwich plates with negative Poisson’s ratio in auxetic honeycombes on elastic foundations subjected to blast and mechanical loads. A three-layer sandwich plate is considered discretized in the thickness direction by using analytical methods (stress function method, approximate solution), Galerkin method, and fourth-order Runge-Kutta method. The results show the effects of geometrical parameters, material properties, mechanical and elastic foundations on the nonlinear dynamic response, and vibration of sandwich plates.

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Abdullah, Kharis, Achmad Zubaydi, and Agung Budipriyanto. "Aplikasi Sandwich Plate System Berbahan Core Limbah Cangkang Kerang pada Geladak Kapal." Wave: Jurnal Ilmiah Teknologi Maritim 12, no. 2 (February 8, 2019): 53–60. http://dx.doi.org/10.29122/jurnalwave.v12i2.2919.

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The development of technology in the field of materials and construction produces many innovations, one of them is sandwich plate system. Sandwich plate system is a material formed by two different materials into one layer. Sandwich plate system consists of face that from plate and core form composite. Clam shells are one of the waste materials that can be used as filler on the core. The composite material that use as a core is a mixture of clam shells powder as filler and resin as a matrix. The combination of clam shells powder and resin, produces strong composite materials. Sandwich plate system using core from clam shelsl powder and resin produce good strength. The material using 20% clam shells powder as filler of the resin weight has maximum stress 53.32 N/mm2 on the deck and 53.20 N/mm2 for 30% of filler by weight of the resin. The maximum stress value is still below the permission stress required by the class rule.

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Zenkour, AM, and AF Radwan. "Free vibration analysis of multilayered composite and soft core sandwich plates resting on Winkler–Pasternak foundations." Journal of Sandwich Structures & Materials 20, no. 2 (June 12, 2016): 169–90. http://dx.doi.org/10.1177/1099636216644863.

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Free vibration of laminated composite and soft core sandwich plates resting on Winkler–Pasternak foundations using four-variable refined plate theory are presented. The theory accounts for the hyperbolic distribution of the transverse shear strains through the plate thickness, and satisfies the zero traction boundary conditions on the surfaces of the plate without using shear correction factors. Equations of motion are derived from the dynamic version of the principle of virtual work. Navier technique is employed to obtain the closed-form solutions of antisymmetric cross-ply, angle-ply, and soft core laminates or soft core sandwich plates resting on elastic foundations. Numerical results obtained using present theory are compared with three-dimensional elasticity solutions and those computed using the first-order and the other higher-order theories. It can be concluded that the proposed theory is not only accurate, but also efficient in predicting the natural frequencies of laminated composite and soft core sandwich plates resting on Winkler–Pasternak foundations.

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Sarangi, S. K., and B. Basa. "Nonlinear finite element analysis of smart laminated composite sandwich plates." International Journal of Structural Stability and Dynamics 14, no. 03 (February 16, 2014): 1350075. http://dx.doi.org/10.1142/s0219455413500752.

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This paper deals with the nonlinear dynamic analysis of smart laminated composite sandwich plates. A three dimensional energy based finite element (FE) model has been developed for the composite sandwich plates integrated with the patches of active constrained layer damping (ACLD) treatment. Von Kármán type nonlinear strain–displacement relations and the first-order shear deformation theory (FSDT) are adopted individually for each layer of the sandwich plate in developing the FE model. The constraining layer of the ACLD treatment is considered to be made of active fiber composite (AFC) material. The Golla–Hughes–McTavish (GHM) method is used to model the constrained viscoelastic layer of the ACLD treatment in the time domain. Sandwich plates with symmetric and antisymmetric laminated faces separated by HEREX core are considered for evaluation of the numerical results. The numerical results indicate that the ACLD patches significantly improve the damping characteristics of the composite sandwich plates for suppressing their geometrically nonlinear transient vibrations. The effect of variation of piezoelectric fiber orientation angle in the AFC material on the control authority of the ACLD patches is also investigated.

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Kurhe Nikhil, M., B. Shedbale Indrajeet, D. Charapale Utkarsh, and R. Manoharan. "Modal Analysis of Hybrid Laminated Composite Sandwich Plate." Materials Today: Proceedings 5, no. 5 (2018): 12453–66. http://dx.doi.org/10.1016/j.matpr.2018.02.225.

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Anish, Ajay Kumar, and Anupam Chakrabarti. "Failure mode analysis of laminated composite sandwich plate." Engineering Failure Analysis 104 (October 2019): 950–76. http://dx.doi.org/10.1016/j.engfailanal.2019.06.080.

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Morozov, E. V., and A. V. Lopatin. "Fundamental Frequency of Fully Clamped Composite Sandwich Plate." Journal of Sandwich Structures & Materials 12, no. 5 (June 24, 2009): 591–619. http://dx.doi.org/10.1177/1099636209106366.

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Zippo, Antonio, Giovanni Ferrari, Marco Amabili, Marco Barbieri, and Francesco Pellicano. "Active vibration control of a composite sandwich plate." Composite Structures 128 (September 2015): 100–114. http://dx.doi.org/10.1016/j.compstruct.2015.03.037.

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Morozov, E. V., and A. V. Lopatin. "Fundamental frequency of the CCCF composite sandwich plate." Composite Structures 92, no. 11 (October 2010): 2747–57. http://dx.doi.org/10.1016/j.compstruct.2010.04.002.

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Chen, Chun-Sheng, Hai Wang, Chin-Chang Yeh, and Wei-Ren Chen. "Dynamic Instability Response of Soft Core Sandwich Plates Based on Higher-Order Plate Theory." International Journal of Structural Stability and Dynamics 21, no. 09 (May 4, 2021): 2150118. http://dx.doi.org/10.1142/s0219455421501182.

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The dynamic stability of the foam-filled sandwich plates under arbitrary periodic loads is studied by using Lo’s high-order shear deformation theory. The periodic load is simulated as a combination of axial stress and bending stress. The governing equations are established based on a perturbation method. Through the derived Mathieu-type equation and using the Bolotin method, the dynamic instability regions are determined by solving the eigenvalue problem. The effects of core thickness, static and dynamic load, and bending stress on the dynamic stability behavior of composite sandwich plates with stiff face sheets and soft foam core are studied. The results reveal that the presented higher-order plate theory adopted gives a better estimate of the dynamic stability of the foam-filled sandwich plate than the first-order plate theory.

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Wang, Zhonglong, Tao Fu, and Bin Li. "Acoustic response analysis of periodic orthogonal stiffened composite sandwich structure with pyramidal truss cores." Journal of Sandwich Structures & Materials 24, no. 3 (February 12, 2022): 1629–52. http://dx.doi.org/10.1177/10996362211060031.

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This paper presents analytical studies on the sound transmission loss behavior of functionally graded carbon nanotube reinforced composite (FG-CNTRC) truss core sandwich structure plates subjected to plane sound wave excitation, wherein three different functionally graded patterns are introduced for the carbon nanotubes through the thickness direction of structures. The effective CNTs material properties for each type are determined by the extended rule of mixture and the governing equations are based on the first order shear deformation theory. The compatibility of displacements on the interface between the plate and the stiffeners is employed to derive the governing equation of each stiffener. By using the modal expansion approach and Rayleigh integral, the sound transmission loss is described analytically. Since no existing results of sound insulation can be found for such composite material plate structure, experimental measurements of composite stiffener sandwich plate which is composed of carbon fiber reinforced composite material are subsequently carried out to validate the theoretical model, and good agreement is achieved. Based on the developed theoretical model, the influences of the volume fractions of CNT, truss core type, distribution type of CNT, stiffener spacing, and truss core height on sound transmission loss are subsequently presented.

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Hayta, Neslihan, and Gaye Kaya. "Flexural response of sandwich composites integrated with 3D multi-layer stitched core." Journal of Sandwich Structures & Materials 24, no. 4 (May 2022): 1847–62. http://dx.doi.org/10.1177/10996362221101330.

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This experimental study investigates the flexural response of sandwich composites integrated with 3D multi-layer stitched core. Polypropylene 3D multi-layer woven fabric impregnated with an epoxy resin was selected as the core, while E-glass fiber reinforced epoxy was used for the sandwich composite face sheets. The sandwich composite exhibited a ductile behavior when loaded in three-point bending as the core layers increased. This is due to the drop in core shear strength with the increased number of core layers. The core layers that were not directly connected with the face sheets deformed most under shear, resulting in a more flexible plate behavior. The number of core layers, size of core unit-cell and stitching density were the critical design parameters determining the flexural strength and stiffness of the sandwich panel. The flexural modulus of sandwich composites with higher stitching density core stiffer than those of lower stitching density.

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Tran, Thanh Trung, Quoc Hoa Pham, Trung Nguyen-Thoi, and The-Van Tran. "Dynamic Analysis of Sandwich Auxetic Honeycomb Plates Subjected to Moving Oscillator Load on Elastic Foundation." Advances in Materials Science and Engineering 2020 (May 12, 2020): 1–16. http://dx.doi.org/10.1155/2020/6309130.

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Based on Mindlin plate theory and finite element method (FEM), dynamic response analysis of sandwich composite plates with auxetic honeycomb core resting on the elastic foundation (EF) under moving oscillator load is investigated in this work. Moving oscillator load includes spring-elastic k and damper c. The EF with two coefficients was modelled by Winkler and Pasternak. The system of equations of motion of the sandwich composite plate can be solved by Newmark’s direct integration method. The reliability of the present method is verified through comparison with the results other methods available in the literature. In addition, the effects of structural parameters, material properties, and moving oscillator loads to the dynamic response of the auxetic honeycomb plate are studied.

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Manoharan, R., R. Vasudevan, and P. Edwin Sudhagar. "Semi-Active Vibration Control of Laminated Composite Sandwich Plate – An Experimental Study." Archive of Mechanical Engineering 63, no. 3 (September 1, 2016): 367–77. http://dx.doi.org/10.1515/meceng-2016-0021.

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Abstract In this study, the vibration analysis of fully and partially treated laminated composite Magnetorheological (MR) fluid sandwich plates has been investigated experimentally. The natural frequencies of fully and partially treated laminated composite MR fluid sandwich plates have been measured at various magnetic field intensities under two different boundary conditions. The variations of natural frequencies with applied magnetic field, boundary conditions and location of MR fluid pocket have been explored. Further, a comparison of natural frequencies of fully and partially treated MR fluid sandwich structure has been made at various magnetic field intensities.

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40

Meunier, M., and R. A. Shenoi. "Free vibration analysis of composite sandwich plates." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 213, no. 7 (July 1, 1999): 715–27. http://dx.doi.org/10.1177/095440629921300707.

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The fibre reinforced plastic (FRP) composite materials configured as sandwich panels are finding increased usage in a variety of structural applications. An important facet in correct usage is an understanding of the dynamic behaviour of such structural configurations. This paper addresses the issue of natural frequencies of sandwich plate panels. The closed-form solutions are obtained using Reddy's first- and higher-order shear deformation theories. The approaches are validated against results from a standard, commercially available finite element analysis package. The paper concludes with a detailed investigation of the influence of variation in material property parameters and plate geometry variables on the natural frequency.

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Hachemi, M., and SM Hamza-Cherif. "Free vibration analysis of composite laminated and sandwich plate with circular cutout." Journal of Sandwich Structures & Materials 22, no. 8 (November 24, 2018): 2655–91. http://dx.doi.org/10.1177/1099636218811393.

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This paper presents the free vibration analysis of a composite laminated and sandwich square plate with circular cutout. The problem formulation is based on the higher order shear deformation plate theory HDST C0 coupled with a curved quadrilateral p-element. The elements of the stiffness and mass matrices are calculated analytically. The curved edges are accurately represented using the blending function method. A calculation program is developed to determine the fundamental frequencies for different physical and mechanical parameters such as the cutout size and location, plate thickness, fiber orientation angle and boundary conditions. The results obtained show a good agreement with the available solutions in the literature. New results for the fundamentals frequencies of composite laminated and sandwich plates with circular cutout are presented.

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Qi, Dezhong, Qiang Sun, Sanqiang Zhang, Yuanfang Wang, and Xiaoqiang Zhou. "Buckling Analysis of a Composite Honeycomb Reinforced Sandwich Embedded with Viscoelastic Damping Material." Applied Sciences 12, no. 20 (October 14, 2022): 10366. http://dx.doi.org/10.3390/app122010366.

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In this study, the buckling loads of a composite sandwich structure, which is reinforced by a honeycomb layer and filled with viscoelastic damping material, are analyzed. By applying von Karman anisotropic plate equations for large deflection, the governing equation of the composite sandwich structure is determined, and the deflection of the structure is further defined by a double triangular series. According to the dynamic equivalent effective stiffness obtained by the homogenous asymptotic method and Hill’s generalized self-consistent model based on the Halpin–Tsai model, limiting the dynamic load buckling of the composite honeycomb reinforced sandwich structure embedded with viscoelastic damping material under axial compression can be achieved. The factors that influence the composite sandwich’s buckling loads are discussed and compared, such as the load and geometry parameters, the thickness of the honeycomb reinforcement layer and the honeycomb’s width. Finally, the results obtained by the present method are validated by the existing literature.

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Shan, Chenglin. "Bending performance of steel–polyurethane sandwich plate under local distributed load." Advances in Structural Engineering 20, no. 11 (January 25, 2017): 1615–22. http://dx.doi.org/10.1177/1369433216687567.

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As a civil engineering application, a composite sandwich plate is introduced into a new or reinforced orthotropic steel bridge deck to reduce the stress concentration of the deck under wheel loading and the amount of stiffening ribs required. For a steel–polyurethane sandwich plate, based on the existing basic differential equation of bending, analytical formulas for stress and deflection at any point of the sandwich plate with four sides simply supported are deduced under a vertical, local uniform load in which wheel loading has been simulated. Sandwich plates of the same material, size, condition of support, and load are tested; the key points of stress and deflection are calculated; and the test results are compared. The results demonstrate that the analytical calculation formulas are reliable and meet engineering accuracy requirements.

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44

Leissa, Arthur W. "A Review of Laminated Composite Plate Buckling." Applied Mechanics Reviews 40, no. 5 (May 1, 1987): 575–91. http://dx.doi.org/10.1115/1.3149534.

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A brief overview is presented of considerations involved in the buckling of composite plates made of laminae having continuous, parallel fibers. Such plates are governed by orthotropic or anisotropic plate buckling theory for laminates which are symmetrically stacked with respect to the plate midplane. Unsymmetric laminates require a more complicated theory with bending-stretching coupling. Additional complicating factors are considered, including: interior holes, shear deformation, sandwich construction involving other materials, local effects, nonlinear stress-strain relationships, hygrothermal effects, and external stiffeners. Postbuckling behavior and the effects of initial imperfections are also described. Some representative results from the extensive literature (352 references) are included to aid in describing the various effects.

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Huang, Zhicheng, Huanyou Peng, Xingguo Wang, and Fulei Chu. "Modeling and Vibration Control of Sandwich Composite Plates." Materials 16, no. 3 (January 17, 2023): 896. http://dx.doi.org/10.3390/ma16030896.

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A finite element dynamic model of the sandwich composite plate was developed based on classical laminate theory and Hamilton’s principle. A 4-node, 7-degree-of-freedom three-layer plate cell is constructed to simulate the interaction between the substrate, the viscoelastic damping layer, and the piezoelectric material layer. Among them, the viscoelastic layer is referred to as the complex constant shear modulus model, and the equivalent Rayleigh damping is introduced to represent the damping of the substrate. The established dynamics model has too many degrees of freedom, and the obtained dynamics model has good controllability and observability after adopting the joint reduced-order method of dynamic condensation in physical space and equilibrium in state space. The optimal quadratic (LQR) controller is designed for the active control of the sandwich panel, and the parameters of the controller parameters, the thickness of the viscoelastic layer, and the optimal covering position of the sandwich panel are optimized through simulation analysis. The results show that the finite element model established in this paper is still valid under different boundary conditions and different covering methods, and the model can still accurately and reliably represent the dynamic characteristics of the original system after using the joint step-down method. Under different excitation signals and different boundary conditions, the LQR control can effectively suppress the vibration of the sandwich plate. The optimal cover position of the sandwich plate is near the solid support end and far from the free-degree end. The parameters of controller parameters and viscoelastic layer thickness are optimized from several angles, respectively, and a reasonable optimization scheme can be selected according to the actual requirements.

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Su, Yi Sheng, Yue Chun Luo, Guo Liang Jiang, Jin Yun Quan, and Yi Shen. "Seismic Analysis of Fly Ash Plate Sandwich Polyurethane Insulation Composite Wall." Applied Mechanics and Materials 275-277 (January 2013): 1003–7. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.1003.

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In order to study the seismic stress performance of the reinforced concrete frame assembly fly ash plate sandwich polyurethane composite wall insulation system (FW). In this paper, 2 bay single-layer single-span hollow fly ash plate sandwich polyurethane in filled frames were tested under low cyclic horizontal loadings with different ratio of high to width and different stiffness frame . Based on the experiment, the damage process, failure mode, load carrying capacity are studied. The interaction between the fly ash plate sandwich polyurethane infill walls and the overall frame of constraint system are investigated. The results indicate that the bearing capacity has little related to height-width ratio of wall; sandwich polyurethane wall panels and frame has good integrity and energy dissipation capacity; the ratio of high to width smaller, ductility of wall is better . After study the failure pattern of the specimen, we know that the bearing capacity of fly ash powder polyurethane thermal insulation wall is not accord with formula of seismic shear of not bearing masonry.

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Mania, Radoslaw. "Buckling analysis of trapezoidal composite sandwich plate subjected to in-plane compression." Composite Structures 69, no. 4 (August 2005): 482–90. http://dx.doi.org/10.1016/j.compstruct.2004.08.005.

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Zhang, Junhua, Xiaodong Yang, and Wei Zhang. "Free Vibrations and Nonlinear Responses for a Cantilever Honeycomb Sandwich Plate." Advances in Materials Science and Engineering 2018 (2018): 1–12. http://dx.doi.org/10.1155/2018/8162873.

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Dynamics of a cantilever honeycomb sandwich plate are studied in this paper. The governing equations of the composite plate subjected to both in-plane and transverse excitations are derived by using Hamilton’s principle and Reddy’s third-order shear deformation theory. Based on the Rayleigh–Ritz method, some modes of natural frequencies for the cantilever honeycomb sandwich plate are obtained. The relations between the natural frequencies and the parameters of the plate are investigated. Further, the Galerkin method is used to transform the nonlinear partial differential equations into a set of nonlinear ordinary differential equations. Nonlinear dynamic responses of the cantilever honeycomb sandwich plate to such external and parametric excitations are discussed by using the numerical method. The results show that in-plane and transverse excitations have an important influence on nonlinear dynamic characteristics. Rich dynamics, such as periodic, multiperiodic, quasiperiodic, and chaotic motions, are located and studied by the bifurcation diagram for some specific parameters.

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Long, Vu Thanh, and Hoang Van Tung. "Thermal postbuckling behavior of CNT-reinforced composite sandwich plate models resting on elastic foundations with tangentially restrained edges and temperature-dependent properties." Journal of Thermoplastic Composite Materials 33, no. 10 (April 10, 2019): 1396–428. http://dx.doi.org/10.1177/0892705719828789.

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Buckling and postbuckling behaviors of sandwich plates reinforced by single-walled carbon nanotube (CNT), rested on elastic foundations and subjected to uniform temperature rise, are investigated in this article. CNT is embedded into matrix phase through uniform or functionally graded distributions. The properties of constituent materials are assumed to be temperature-dependent, and effective properties of nanocomposite are determined by extended rule of mixture. Two models of sandwich plates with face sheets and core layer reinforced by CNTs are presented. Formulations are based on the first-order shear deformation theory taking geometrical nonlinearity, initial geometrical imperfection, plate-foundation interaction, and elasticity of tangential edge constraints into consideration. Analytical solutions of deflection and stress function are assumed, and Galerkin method is applied to derive nonlinear temperature–deflection relation from which buckling temperatures and thermal postbuckling paths are obtained through an iteration algorithm. Numerical examples show the effects of CNT volume fraction, distribution patterns, in-plane edge constraint, elastic foundations, geometrical ratios, initial imperfection, and temperature dependence of properties on thermal postbuckling behavior of nanocomposite sandwich plates. The most important finding is that sandwich plate constructed from CNT-poor nanocomposite core layer and thin homogeneous face sheets with partially movable edges bring the best capacities of thermal buckling resistance and postbuckling load carrying.

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Ghorbanpour Arani, A., H. Khani Arani, and Z. Khoddami Maraghi. "Size-dependent in vibration analysis of magnetostrictive sandwich composite micro-plate in magnetic field using modified couple stress theory." Journal of Sandwich Structures & Materials 21, no. 2 (March 14, 2017): 580–603. http://dx.doi.org/10.1177/1099636217697495.

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In the present study, free vibration of magnetostrictive sandwich composite micro plate with magnetostrictive core and composite face sheets are investigated. The modified couple stress theory is taken into account so as to consider the small scale effects. The surrounding elastic medium is simulated as visco-Pasternak foundation to study the effects of both damping and shear effects. Using energy method, Hamilton’s principle and first-order shear deformation theory, the governing equations of motion and related boundary conditions are obtained. Finally, the differential quadrature method is employed to analysis the vibration of magnetostrictive sandwich composite micro plate. In this regard, the dimensionless frequency are plotted to study the effects of small scale parameter, surrounding elastic medium, magnetic field, composite fiber angle, aspect ratio, thickness ratio, and boundary conditions. The results indicate that the magnetic field and composite fiber angle play a key role in the dimensionless frequency of magnetostrictive sandwich composite micro plate. The obtained results in this article can be used to design sensors and actuators, aerospace industry, and control of vibration response of systems.

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Journal articles on the topic 'Composite and sandwich plate'

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