Articles de revues : « Structural analysis (Engineering) Composite materials. Finite element method »

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Imura, Makoto, Tetsusei Kurashiki, Hiroaki Nakai et Masaru Zako. « A Multi-Scale Analysis for an Evaluation of the Mechanical Properties of Composite Materials ». Key Engineering Materials 334-335 (mars 2007) : 585–88. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.585.

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Fiber reinforced composite materials have been applied widely to many structures, because they have some advantages like easy handling, high specific strength, etc. The numerical method like finite element method has been applied to design and to evaluate the material properties and behavior as the development of Computer Aided Engineering. It is very difficult to calculate with accuracy not only in structural scale but also in detail material scale (for example, the order of fiber diameter) by the traditional FEM, becausecompositematerials like woven fabric composites have the geometrical complexityand the large difference between above mentioned scales. The development of multi-scale analysis method is one of the major topics in computational mechanics. Mesh superpositionis one of multi-scale analysis methods and is an effective method to solve the problems which have the large difference between the structure scale and the reinforcement scale. We have expanded the finite element mesh superposition method with 3 scales and have defined as M3 (Macro-Meso-Micro) method. In this paper, we have proposed a new approach method combined with M3 method and homogenized method to obtain the mechanical properties and to simulate the behavior of woven fabric composites. In addition, the elastic-plastic mechanics and the damage mechanics have been introduced into M3 method to investigate the effects of matrix-crack on the structural and material properties. From the numerical results, it is revealed that it is very useful for the evaluation of mechanical properties of composite materials.

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Boudounit, Hicham, Mostapha Tarfaoui, Dennoun Saifaoui et Mourad Nachtane. « Structural analysis of offshore wind turbine blades using finite element method ». Wind Engineering 44, n^o 2 (23 mai 2019) : 168–80. http://dx.doi.org/10.1177/0309524x19849830.

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Wind energy is one among the most promising renewable energy sources, and hence there is fast growth of wind energy farm implantation over the last decade, which is expected to be even faster in the coming years. Wind turbine blades are complex structures considering the different scientific fields involved in their study. Indeed, the study of blade performance involves fluid mechanics (aerodynamic study), solids mechanics (the nature of materials, the type of solicitations …), and the fluid coupling structure (IFS). The scope of the present work is to investigate the mechanical performances and structural integrity of a large offshore wind turbine blade under critical loads using blade element momentum. The resulting pressure was applied to the blade by the use of a user subroutine “DLOAD” implemented in ABAQUS finite element analysis software. The main objective is to identify and predict the zones which are sensitive to damage and failure as well as to evaluate the potential of composite materials (carbon fiber and glass fiber) and their effect on reduction of rotor’s weight, as well as the increase of resistance to wear, and stiffness.

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You, Feng Xiang, Fei Zhang et Buo Lei Zuo. « Spline-Based Finite Element Analysis in Composite Laminates Mechanical Properties ». Applied Mechanics and Materials 138-139 (novembre 2011) : 673–80. http://dx.doi.org/10.4028/www.scientific.net/amm.138-139.673.

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The geometric parameters of the composite laminate in the engineering structure tend to have random properties. It is of great significance on how to study sensitivity of random parameters of laminated plates and carry on the optimized analysis to the parameteranalys when accurately estimating the reliability of structural design. According to the first order shear deformation theory, by using the spline finite element method, we can infer and the establish a laminated plate vibration equation, the stiffness matrix, mass matrix, proportional damping matrix, before making solution of the antisymmetric laminated plates response sensitivity formula, and analyzing the normal displacement, the sensitivity, the natural frequency of compound materials laminated plate. The Numerical examples verify the effectiveness of this algorithm.

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Lee, Dong Gyu, Ji Woo Nam, Soo-Hyun Kim et Seong Wook Cho. « Structure Optimization of a High-Temperature Oxygen-Membrane Module Using Finite Element Analysis ». Energies 14, n^o 16 (14 août 2021) : 4992. http://dx.doi.org/10.3390/en14164992.

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The oxygen transport membrane (OTM) is a high-density ion-conducting ceramic membrane that selectively transfers oxygen ions and electrons through the pressure differential across its layers. It can operate at more than 800 °C and serves as an economical method for gas separation. However, it is difficult to predict the material properties of the OTM through experiments or analyses because its structure contains pores and depends on the characteristics of the ceramic composite. In addition, the transmittance of porous ceramic materials fluctuates strongly owing to their irregular structure and arbitrary shape, making it difficult to design such materials using conventional methods. This study analyzes the structural weakness of an OTM using CAE software (ANSYS Inc., Pittsburgh, PA, USA). To enhance the structural strength, a structurally optimized design of the OTM was proposed by identifying the relevant geometric parameters.

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Lin, J. J., M. Fafard, D. Beaulieu et B. Massicotte. « Nonlinear analysis of composite bridges by the finite element method ». Computers & ; Structures 40, n^o 5 (janvier 1991) : 1151–67. http://dx.doi.org/10.1016/0045-7949(91)90386-z.

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A, Karthick. « Temperature Distribution Analysis of Composite Heat Sink (Pin Fin) by Experimental and Finite Element Method ». Journal of Manufacturing Engineering 16, n^o 1 (1 mars 2021) : 018–23. http://dx.doi.org/10.37255/jme.v16i1pp018-023.

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Design of machine components plays a vital role in the field of Engineering where it includes the shape of component, size, applied loads, position and materials used. Due to the applied loads namely static, thermal and combined loads etc., the component undergoes stresses and deformations which affect the life of component and also the system. The Finite Element Method (FEM) is a numerical tool used for solving problems of engineering and mathematical problems in the fields of structural analysis, heat transfer, fluid flow, mass transport etc., For problems involving complicated geometries, loadings and material properties, it is generally not possible to obtain analytical solutions. These solutions generally require the ordinary or partial differential equations. Because of the complicated geometries, loadings and material properties, the solution can’t be obtained easily. So, in FEM the complicated shape of the component is divided in to small entities called elements. Element characteristics are studied and then all the elements are combined to make a single system of component. In the present work, Experiments have been conducted to find the temperature distribution within the pin fin made of composite metals and steady state heat transfer analysis has been carried using a finite element software ANSYS to test and validate results. The temperature distribution at different regions of pin fin are evaluated by FEM and compared with the results obtained by experimental work. The results are in good agreement and thus validated.

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Youn, Sung-Kie, et E. B. Becker. « A finite element method for the analysis of piezoelectric composite hydrophones ». Computers & ; Structures 44, n^o 6 (septembre 1992) : 1215–23. http://dx.doi.org/10.1016/0045-7949(92)90365-7.

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Tran, Trung Thanh, Van Ke Tran, Pham Binh Le, Van Minh Phung, Van Thom Do et Hoang Nam Nguyen. « Forced Vibration Analysis of Laminated Composite Shells Reinforced with Graphene Nanoplatelets Using Finite Element Method ». Advances in Civil Engineering 2020 (3 janvier 2020) : 1–17. http://dx.doi.org/10.1155/2020/1471037.

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This paper carries out forced vibration analysis of graphene nanoplatelet-reinforced composite laminated shells in thermal environments by employing the finite element method (FEM). Material properties including elastic modulus, specific gravity, and Poisson’s ratio are determined according to the Halpin–Tsai model. The first-order shear deformation theory (FSDT), which is based on the 8-node isoparametric element to establish the oscillation equation of shell structure, is employed in this work. We then code the computing program in the MATLAB application and examine the verification of convergence rate and reliability of the program by comparing the data of present work with those of other exact solutions. The effects of both geometric parameters and mechanical properties of materials on the forced vibration of the structure are investigated.

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Javanbakht, Zia, Wayne Hall, Amandeep Singh Virk, John Summerscales et Andreas Öchsner. « Finite element analysis of natural fiber composites using a self-updating model ». Journal of Composite Materials 54, n^o 23 (24 mars 2020) : 3275–86. http://dx.doi.org/10.1177/0021998320912822.

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The aim of the current work was to illustrate the effect of the fibre area correction factor on the results of modelling natural fibre-reinforced composites. A mesoscopic approach is adopted to represent the stochastic heterogeneity of the composite, i.e. a meso-structural numerical model was prototyped using the finite element method including quasi-unidirectional discrete fibre elements embedded in a matrix. The model was verified by the experimental results from previous work on jute fibres but is extendable to every natural fibre with cross-sectional non-uniformity. A correction factor was suggested to fine-tune both the analytical and numerical models. Moreover, a model updating technique for considering the size-effect of fibres is introduced and its implementation was automated by means of FORTRAN subroutines and Python scripts. It was shown that correcting and updating the fibre strength is critical to obtain accurate macroscopic response of the composite when discrete modelling of fibres is intended. Based on the current study, it is found that consideration of the effect of flaws on the strength of natural fibres and inclusion of the fibre area correction factor are crucial to obtain realistic results.

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Cheng, Tai Hong, Il Soo Kim, Soon Young Park, Zhen Zhe Li et Yun De Shen. « Structural Stability Analyses of Composite Laminate Wind Turbine ». Advanced Materials Research 287-290 (juillet 2011) : 1486–91. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.1486.

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The paper describes a structural stability analysis of fiber reinforced 10kW composite laminate wind turbine blades by using finite element method. The E-glass/epoxy orthotropic materials DB300、DBL850、L900 were employed for construction of a composite laminate shell structure. The composite laminate sheel structures were constructed by two types of lamination method. The rotating effect of wind blade was considered using the linear and the nonlinear static analysis. The results of the nonlinear analysis of displacement and stress show much lower than the linear analysis, because of the geometry nonlinear effect. From the contours of stress and displacement, the maximum stress appeared at the root of the blade, and maximum deformation occurred at the tip of the blade. Finally, the modal properties of the wind blade was investigated, including the natural frequency, modeshaps, and the centrifugal effect.

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Morrison, Andrew, Mark Garnich et Ray S. Fertig. « Reliability analysis of a woven composite Pi-joint structure ». Journal of Composite Materials 51, n^o 29 (9 mars 2017) : 4101–14. http://dx.doi.org/10.1177/0021998317696343.

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The finite element (FE) method combined with multicontinuum theory (MCT) for analyzing composites was coupled with reliability analysis to develop a probabilistic, progressive failure, multiscale analysis of a three-dimensional braided composite Pi-joint subject to shear loading. The constituent engineering constants, ply strengths, and structural geometric parameters were treated as random variables. Failure was defined in the progressive failure framework as a minimum structure stiffness. NESSUS reliability analysis, HELIUS MCT, and Abaqus® FE analysis software packages were interfaced to create a global framework for performing multiscale reliability analysis of the composite structure. The reliability analysis resulted in the calculation of the probability of failure and sensitivities of the probability of failure to the random variables defined in the model. The model's probability of failure was most sensitive to the geometric parameters defining the thickness of the upright portion of the Pi-joint and the depth of the Pi-joint. The model's response was also sensitive to the compressive strength of the composite.

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Zhang, Hongjun, Guangsong Chen, Linfang Qian et Jia Ma. « FE-Meshfree QUAD4 Element with Modified Radial Point Interpolation Function for Structural Dynamic Analysis ». Shock and Vibration 2019 (8 janvier 2019) : 1–23. http://dx.doi.org/10.1155/2019/3269276.

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The partition-of-unity method based on FE-Meshfree QUAD4 element synthesizes the respective advantages of meshfree and finite element methods by exploiting composite shape functions to obtain high-order global approximations. This method yields high accuracy and convergence rate without necessitating extra nodes or DOFs. In this study, the FE-Meshfree method is extended to the free and forced vibration analysis of two-dimensional solids. A modified radial point interpolation function without any supporting tuning parameters is applied to construct the composite shape functions. The governing equations of elastodynamic problem are transformed into a standard weak formulation and then discretized into time-dependent equations which are solved via Bathe time integration scheme to conduct the forced vibration analysis. Several numerical test problems are solved and compared against previously published numerical solutions. Results show that the proposed FE-Meshfree QUAD4 element owns greater tolerance for mesh distortion and provides more accurate solutions.

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Zou, Zhiqing. « FREE VIBRATION ANALYSIS OF COMPOSITE LAMINATED RIGHT TRIANGULAR PLATES WITH THE FINITE-ELEMENT METHOD ». Mechanics of Advanced Materials and Structures 5, n^o 1 (1998) : 25–39. http://dx.doi.org/10.1080/10759419808945891.

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Rao, MV Peereswara, K. Renji et Dineshkumar Harursampath. « Asymptotic theory of 3D thermoelastic stress analysis of honeycomb sandwich panels with composite facesheets ». Journal of Sandwich Structures & ; Materials 22, n^o 6 (4 août 2018) : 1952–82. http://dx.doi.org/10.1177/1099636218791105.

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This work presents an asymptotical thermoelastic model for analyzing symmetric composite sandwich plate structures. Use of three-dimensional finite elements to analyze real-life composite sandwich structures is computationally prohibitive, while use of two-dimensional finite element cannot accurately predict the transverse stresses and three-dimensional displacements. Endeavoring to fill this gap, the present theory is developed based on the variational asymptotic method. The unique features of this work are the identification and utilization of small parameters characterizing the geometry and material stiffness coefficients of sandwich structural panels in addition to the small parameters pertaining to any plate-like structure. In this formulation, using variational asymptotic method, the three-dimensional thermoelastic problem is mathematically split into a one-dimensional through-the-thickness analysis, and a two-dimensional reference surface analysis. The through-the-thickness analysis provides the constitutive relation between the generalized two-dimensional strains, and the generalized force resultants for the plate analysis, it also provides a set of closed-form solutions to express the three-dimensional responses in terms of two-dimensional variables, which are determined by solving the equilibrium equations of the plate reference surface. Numerical results are illustrated for a typical composite sandwich panel subjected to a linear-bisinusoidal thermal loading. The three-dimensional responses of the composite sandwich structure from the present theory are compared with the three-dimensional finite element solutions of MSC NASTRAN®. The results from the present theory agree closely with three-dimensional finite element results and yet enable order of magnitude saving in computational resources and time.

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Chen, L. W., et L. Y. Chen. « Thermal deformation and stress analysis of composite laminated plates by finite element method ». Computers & ; Structures 35, n^o 1 (janvier 1990) : 41–49. http://dx.doi.org/10.1016/0045-7949(90)90254-y.

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Duffy, S. F., J. L. Palko et J. P. Gyekenyesi. « Structural Reliability Analysis of Laminated CMC Components ». Journal of Engineering for Gas Turbines and Power 115, n^o 1 (1 janvier 1993) : 103–8. http://dx.doi.org/10.1115/1.2906663.

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For laminated ceramic matrix composite (CMC) materials to realize their full potential in aerospace applications design, methods and protocols are a necessity. This paper focuses on the time-independent failure response of these materials and presents a reliability analysis associated with the initiation of matrix cracking. It highlights a public domain computer algorithm that has been coupled with the laminate analysis of a finite element code and which serves as a design aid to analyze structural components made from laminated CMC materials. Issues relevant to the effect of the size of the component are discussed, and a parameter estimation procedure is presented. The estimation procedure allows three parameters to be calculated from a failure population that has an underlying Weibull distribution.

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Liu, Zhihao, Renren Wang, Fang Cao et Pidong Shi. « Dynamic Behaviour Analysis of Turbocharger Rotor-Shaft System in Thermal Environment Based on Finite Element Method ». Shock and Vibration 2020 (14 août 2020) : 1–18. http://dx.doi.org/10.1155/2020/8888504.

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The stable operation of a high-speed rotating rotor-bearing system is dependent on the internal damping of its materials. In this study, the dynamic behaviours of a rotor-shaft system with internal damping composite materials under the action of a temperature field are analysed. The temperature field will increase the tangential force generated by the internal damping of the composite material. The tangential force will also increase with the rotor speed, which can destabilise the rotor-shaft system. To better understand the dynamic behaviours of the system, we introduced a finite element calculation model of a rotor-shaft system based on a 3D high-order element (Solid186) to study the turbocharger rotor-bearing system in a temperature field. The analysis was done according to the modal damping coefficient, stability limit speed, and unbalance response. The results show that accurate prediction of internal damping energy dissipation in a temperature field is crucial for accurate prediction of rotor dynamic performance. This is an important step to understand dynamic rotor stress and rotor dynamic design.

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Breuer, Kevin, Axel Spickenheuer et Markus Stommel. « Statistical Analysis of Mechanical Stressing in Short Fiber Reinforced Composites by Means of Statistical and Representative Volume Elements ». Fibers 9, n^o 5 (6 mai 2021) : 32. http://dx.doi.org/10.3390/fib9050032.

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Analyzing representative volume elements with the finite element method is one method to calculate the local stress at the microscale of short fiber reinforced plastics. It can be shown with Monte-Carlo simulations that the stress distribution depends on the local arrangement of the fibers and is therefore unique for each fiber constellation. In this contribution the stress distribution and the effective composite properties are examined as a function of the considered volume of the representative volume elements. Moreover, the influence of locally varying fiber volume fraction is examined, using statistical volume elements. The results show that the average stress probability distribution is independent of the number of fibers and independent of local fluctuation of the fiber volume fraction. Furthermore, it is derived from the stress distributions that the statistical deviation of the effective composite properties should not be neglected in the case of injection molded components. A finite element analysis indicates that the macroscopic stresses and strains on component level are significantly influenced by local, statistical fluctuation of the composite properties.

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Hu, Jiaming, Junyi Wang, Yu Xie, Chenzhi Shi et Yun Chen. « Finite Element Analysis on Acoustic and Mechanical Performance of Flexible Perforated Honeycomb-Corrugation Hybrid Sandwich Panel ». Shock and Vibration 2021 (16 mai 2021) : 1–14. http://dx.doi.org/10.1155/2021/9977644.

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Since proposed, the perforated honeycomb-corrugation sandwich panel has attracted a lot of attention due to its superior broadband sound absorption at low frequencies and excellent mechanical stiffness/strength. However, most existing studies have assumed a structure made of high-strength materials and studied its performance based on the ideal rigid-wall model with little consideration for acoustic-structure interaction, thereby neglecting the structural vibrations caused by the material’s elasticity. In this paper, we developed a more realistic model considering the solid structural dynamics using the finite element method (FEM) and by applying aluminum and rubber as the structural material. The enhancement of the low-frequency performance and inhibition of broadband absorption coexisted in low-strength rubbers, implying a compromise in the selection of Young's modulus to balance these two influences. Further analysis on thermal-viscous dissipation, mechanical energy, and average structural stress indicated that the structure should work right below the resonant frequency for optimization. Based on these findings, we designed a novel aluminum-rubber composite structure possessing enhanced low-frequency absorption, high resistance to shear load, normal compression, and thermal expansion. Our research is expected to shed some light on noise control and the design of multifunctional acoustic metamaterials.

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Tran, Thanh Trung, Quoc Hoa Pham, Trung Nguyen-Thoi et 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 (12 mai 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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Chen, Nian-Zhong, et C. Guedes Soares. « Ultimate Longitudinal Strength of Ship Hulls of Composite Materials ». Journal of Ship Research 52, n^o 03 (1 septembre 2008) : 184–93. http://dx.doi.org/10.5957/jsr.2008.52.3.184.

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A progressive collapse analysis method is proposed to predict the ultimate longitudinal strength of ship hulls of composite materials. The load-average strain curve derived from a progressive failure nonlinear finite element analysis is adopted for representing the behavior of each stiffened composite panel forming a hull cross section. The bending moment of the ship hull under a prescribed curvature is achieved by integrating the reaction force of each stiffened panel over a hull cross section based on the load-average strain curves. The ultimate longitudinal strength of a ship hull is obtained from the moment-curvature relationship of the ship hull, which is established by imposing progressively increasing curvatures of a hull cross section. An all-composite ship is analyzed as an application.

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Gozum, Mehmet Murat, Amirreza Aghakhani, Gokhan Serhat et Ipek Basdogan. « Electroelastic modeling of thin-laminated composite plates with surface-bonded piezo-patches using Rayleigh–Ritz method ». Journal of Intelligent Material Systems and Structures 29, n^o 10 (1 mars 2018) : 2192–205. http://dx.doi.org/10.1177/1045389x18758189.

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Laminated composite panels are extensively used in various engineering applications. Piezoelectric transducers can be integrated into such composite structures for a variety of vibration control and energy harvesting applications. Analyzing the structural dynamics of such electromechanical systems requires precise modeling tools which properly consider the coupling between the piezoelectric elements and the laminates. Although previous analytical models in the literature cover vibration analysis of laminated composite plates with fully covered piezoelectric layers, they do not provide a formulation for modeling the piezoelectric patches that partially cover the plate surface. In this study, a methodology for vibration analysis of laminated composite plates with surface-bonded piezo-patches is developed. Rayleigh–Ritz method is used for solving the modal analysis and obtaining the frequency response functions. The developed model includes mass and stiffness contribution of the piezo-patches as well as the two-way electromechanical coupling effect. Moreover, an accelerated method is developed for reducing the computation time of the modal analysis solution. For validations, system-level finite element simulations are performed in ANSYS software. The results show that the developed analytical model can be utilized for accurate and efficient analysis and design of laminated composite plates with surface-bonded piezo-patches.

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Shen, Liu-Lei, Zhi-Bin Shen, Yan Xie et Hai-Yang Li. « Effective Mechanical Property Estimation of Composite Solid Propellants Based on VCFEM ». International Journal of Aerospace Engineering 2018 (2018) : 1–9. http://dx.doi.org/10.1155/2018/2050876.

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A solid rocket motor is one of the critical components of solid missiles, and its life and reliability mostly depend on the mechanical behavior of a composite solid propellant (CSP). Effective mechanical properties are critical material constants to analyze the structural integrity of propellant grain. They are estimated by a numerical method that combines the Voronoi cell finite element method (VCFEM) and the homogenization method in the present paper. The correctness of this combined method has been validated by comparing with a standard finite element method and conventional theoretical models. The effective modulus and the effective Poisson’s ratio of a CSP varying with volume fraction and component material properties are estimated. The result indicates that the variations of the volume fraction of inclusions and the properties of the matrix have obvious influences on the effective mechanical properties of a CSP. The microscopic numerical analysis method proposed in this paper can also be used to provide references for the design and the analysis of other large volume fraction composite materials.

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Vijayarangan, S., et N. Ganesan. « A static analysis of composite helical gears using a three-dimensional finite element method ». Computers & ; Structures 49, n^o 2 (octobre 1993) : 253–68. http://dx.doi.org/10.1016/0045-7949(93)90106-n.

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Chen, Lien-Wen, et Der-Ming Ku. « Dynamic stability analysis of a composite material planar mechanism by the finite element method ». Computers & ; Structures 33, n^o 6 (janvier 1989) : 1333–42. http://dx.doi.org/10.1016/0045-7949(89)90473-2.

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Saidin, Siti Shahirah, Adiza Jamadin, Sakhiah Abdul Kudus et Norliyati Mohd Amin. « Comparison of Flexural Behaviour of Composite FRP with UHPC I-Beam Using Finite Element Analysis ». Materials Science Forum 1042 (10 août 2021) : 151–56. http://dx.doi.org/10.4028/www.scientific.net/msf.1042.151.

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Concrete can be considered as the ultimate construction material since it is the most widely used in the construction materials due to its extensive strength and reasonable cost. Recent years, large investments have been spent for studies on the new advanced materials to enhance the performance and functionality of conventional concrete especially for bridge structure. The application of Ultra-high-performance concrete (UHPC) as advanced materials in bridge application is well established since it able to construct 100m long highway bridge without reinforcement, while fiber reinforced polymers (FRP) required some studies on the optimum composition for bridge application. In this paper, A33 composite FRP from the previous research is studied under 4-point bending test to study the flexural behavior and compared to the UHPC. Three-dimensional finite element analysis of FRP and UHPC I-beam are modelled using Abaqus software to determine and compare the beam deflection and stress. The deflection and stress UHPC and FRP I-beam model being validated with experimental result of four-point bending test and theoretical of equivalent method in previous research. The results from the analytical and experimental are compared and shows good agreements. The presented modeling offers an economical and efficient tool to investigate the structural performance of FRP and UHPC in construction materials.

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Argyris, John, et Lazarus Tenek. « Recent Advances in Computational Thermostructural Analysis of Composite Plates and Shells With Strong Nonlinearities ». Applied Mechanics Reviews 50, n^o 5 (1 mai 1997) : 285–306. http://dx.doi.org/10.1115/1.3101708.

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The article presents some modern developments in computational technology for the nonlinear thermostructural analysis of laminated composite plates and shells of arbitrary geometry. Following a review of the current state of the art, it particularly emphasizes on new finite element methodologies that can be applied to the study of complex laminated shells both thermally and structurally using the same topology constructed via simple simplex triangular elements based on respective first-order lamination theories. Very high temperatures are imposed on some examples in order to demonstrate the high effect of nonlinearity. In addition, the authors want to prepare the ground for the advent of new high-temperature materials. For the numerical examples presented comparison with reference solutions is made where available. Thus the present overview intends to impact a continuing discussion on the unification and integration of thermal and structural analyses methods as they apply to large and complex high-temperature composite shell structures under combined thermal and mechanical loading. In this respect it also intends to contribute to the on-going efforts of integrating thermal and structural engineering codes and the development of suitable interfaces. Future research trends are also identified.

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Ren, Shanhong, et Guozhong Zhao. « A four-node quadrilateral element for vibration and damping analysis of sandwich plates with viscoelastic core ». Journal of Sandwich Structures & ; Materials 21, n^o 3 (7 juin 2017) : 1072–118. http://dx.doi.org/10.1177/1099636217707714.

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Constrained layer damping treatments have been widely used as an effective way for vibration control and noise reduction of thin-walled plates and shells. Despite extensive application in vibration and damping analysis of sandwich plates with viscoelastic core, the rectangular element is challenged by irregular structural forms in practical engineering. In this paper, a three-layer four-node quadrilateral element with seven degrees of freedom at each node is presented. Compared with classical rectangular element, the four-node quadrilateral element has stronger adaptability in complex structural forms and boundary conditions. Based on the layer-wise theory where the constrained layer and the base layer meet Kirchhoff theory and the viscoelastic layer satisfies first-order shear deformation theory, the finite element formulation of the sandwich plate with viscoelastic core is derived by the Hamilton principle in variational form and based on the generalization of the discrete Kirchhoff Quadrilateral plate element. The complex modulus model is employed to describe the viscoelastic core of sandwich plates, allowing for the material’s frequency dependent characteristics. The natural frequencies and associated modal loss factors are computed based on the complex eigenvalue problems. The frequency dependent characteristic of the viscoelastic core is considered and an iterative procedure is introduced to solve the nonlinear eigenvalue problem. At last, six verification numerical examples that include three sandwich beam-plates and three sandwich plates are provided to compare present method with experiment, analytical method, Galerkin method, finite element methods and commercial software (NASTRAN). The results show that the proposed finite element can accurately and efficiently simulate the sandwich plates treated with constrained layer damping with a variety of structural forms and boundary conditions.

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Irez, Alaeddin Burak, Emin Bayraktar et Ibrahim Miskioglu. « Fracture Toughness Analysis of Epoxy-Recycled Rubber-Based Composite Reinforced with Graphene Nanoplatelets for Structural Applications in Automotive and Aeronautics ». Polymers 12, n^o 2 (14 février 2020) : 448. http://dx.doi.org/10.3390/polym12020448.

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This study proposes a new design of lightweight and cost-efficient composite materials for the aeronautic industry utilizing recycled fresh scrap rubber, epoxy resin, and graphene nanoplatelets (GnPs). After manufacturing the composites, their bending strength and fracture characteristics were investigated by three-point bending (3PB) tests. Halpin–Tsai homogenization adapted to composites containing GnPs was used to estimate the moduli of the composites, and satisfactory agreement with the 3PB test results was observed. In addition, 3PB tests were simulated by finite element method incorporating the Halpin–Tsai homogenization, and the resulting stress–strain curves were compared with the experimental results. Mechanical test results showed that the reinforcement with GnPs generally increased the modulus of elasticity as well as the fracture toughness of these novel composites. Toughening mechanisms were evaluated by SEM fractography. The typical toughening mechanisms observed were crack deflection and cavity formation. Considering the advantageous effects of GnPs on these novel composites and cost efficiency gained by the use of recycled rubber, these composites have the potential to be used to manufacture various components in the automotive and aeronautic industries as well as smart building materials in civil engineering applications.

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Wang, Wenyuan, Wenbin Ye, Li Ren et Ying Jiang. « A scaled boundary finite element method for bending analysis of fiber-reinforced piezoelectric laminated composite plates ». International Journal of Mechanical Sciences 161-162 (octobre 2019) : 105011. http://dx.doi.org/10.1016/j.ijmecsci.2019.105011.

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Mittelstedt, Christian, et Wilfried Becker. « Free-Edge Effects in Composite Laminates ». Applied Mechanics Reviews 60, n^o 5 (1 septembre 2007) : 217–45. http://dx.doi.org/10.1115/1.2777169.

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There are many technical applications in the field of lightweight construction as, for example, in aerospace engineering, where stress concentration phenomena play an important role in the design of layered structural elements (so-called laminates) consisting of plies of fiber reinforced plastics or other materials. A well known stress concentration problem rich in research tradition is the so-called free-edge effect. Mainly explained by the mismatch of the elastic material properties between two adjacent dissimilar laminate layers, the free-edge effect is characterized by the concentrated occurrence of three-dimensional and singular stress fields at the free edges in the interfaces between two layers of composite laminates. In the present contribution, a survey on relevant literature from more than three decades of scientific research on free-edge effects is given. The cited references date back to 1967 and deal with approximate closed-form analyses, as well as numerical investigations by the finite element method, the finite difference method, and several other numerical techniques. The progress in research on the stress singularities which arise is also reviewed, and references on experimental investigations are cited. Related problems are also briefly addressed. The paper closes with concluding remarks and an outlook on future investigations. In all, 292 references are included.

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Vijayarangan, S., et N. Ganesan. « Static stress analysis of a composite bevel gear using a three-dimensional finite element method ». Computers & ; Structures 51, n^o 6 (janvier 1994) : 771–83. http://dx.doi.org/10.1016/s0045-7949(05)80017-3.

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Ganesan, N., et S. Vijayarangan. « A static analysis of metal matrix composite spur gear by three-dimensional finite element method ». Computers & ; Structures 46, n^o 6 (mars 1993) : 1021–27. http://dx.doi.org/10.1016/0045-7949(93)90088-u.

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Ling, Jianming, Fulu Wei, Hongduo Zhao, Yu Tian, Bingye Han et Zhi'ang Chen. « Analysis of airfield composite pavement responses using full-scale accelerated pavement testing and finite element method ». Construction and Building Materials 212 (juillet 2019) : 596–606. http://dx.doi.org/10.1016/j.conbuildmat.2019.03.336.

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Ling, Jianming, Liang Ren, Yu Tian, Jianhua Gao et Li Man. « Analysis of airfield composite pavement rutting using full-scale accelerated pavement testing and finite element method ». Construction and Building Materials 303 (octobre 2021) : 124528. http://dx.doi.org/10.1016/j.conbuildmat.2021.124528.

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Zhai, Jingyu, Yugang Chen, Xinyuan Song, Hongchun Wu et Qingkai Han. « Identification of the Anisotropic Elastic Parameters of NiCrAlY Coating by Combining Nanoindentation and Finite Element Method ». Shock and Vibration 2019 (2 juin 2019) : 1–13. http://dx.doi.org/10.1155/2019/9034750.

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For vibration damping, coatings are prepared on surface of the structures (substrates), which constitute the coating-substrate composite structures. Elastic parameters of the coating are indispensable for the vibration and damping analysis of the composite structure. Due to the small scale of coating thickness and elastic difference compared with the substrate, the identification results are inevitably influenced by the existence of substrate. Moreover, resulting from the preparation process, elastic properties of hard coating often exhibit anisotropic properties. All the above factors bring about the difficulties of accurate identification. In this study, a method for identifying anisotropic elastic parameters of hard coatings considering substrate effect is proposed, by combining nanoindentation and finite element analysis. Based on the identification results, finite element models are established to analyze the vibration characteristics of the coating-substrate composite structure, which verify the rationality of the anisotropic elastic parameters for vibration analysis. The studies in this paper are significant to more accurately identify the mechanical parameters for establishing the dynamic model. Moreover, they lay the foundation for further optimization design of hard coating damping.

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Chen, Hao, Chihua Lu, Zhien Liu, Cunrui Shen, Yi Sun et Menglei Sun. « Structural Modal Analysis and Optimization of SUV Door Based on Response Surface Method ». Shock and Vibration 2020 (20 janvier 2020) : 1–11. http://dx.doi.org/10.1155/2020/9362434.

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Sensitivity analysis and response surface methods were employed to optimize the structural modal of SUV doors. A finite element numerical simulation model was established and was calibrated by restraint modal tests. To screen out highly sensitive panels, a sensitivity analysis for the thickness of door panels was proposed based on the fifth-order modal frequency of the door. Data points were obtained by a faced central composite design with the design variables from the thickness of the highly sensitive panels, and a second-order explicit response surface function of the fifth-order modal frequency of the vehicle door was established. An optimization model was established according to the response surface method. The final results demonstrate that the modal-frequency matching of the door and body in white was optimized after changing the thicknesses, with a 5.74% material reduction.

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Rais-Rohani, Masoud, Christopher D. Eamon et Amy L. Keesecker. « Structural Analysis and Sizing Optimization of a Composite Advanced Sail Design Concept ». Marine Technology and SNAME News 42, n^o 02 (1 avril 2005) : 61–70. http://dx.doi.org/10.5957/mt1.2005.42.2.61.

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Numerical design optimization coupled with finite-element analysis is applied to an advanced design concept for a submarine sail structure made of composite materials. Through a detailed design sensitivity analysis, the influence of stiffener and skin sizing on the weight and buckling characteristics of the sail structure is quantified. Furthermore, the sail is optimized for minimum weight under a severe loading condition based on two alternative discretization concepts for modeling the variations in skin thickness. The design constraints include the lower-bound limits on load factors corresponding to the lowest 10 buckling modes as well as the allowable normal and shear strains in each ply. The sizing optimization problem is solved using the modified exterior penalty function method. The results indicate that depending on the discretization concept, it is possible to reduce the structural weight by as much as 14% over the baseline model while meeting all the structural design criteria. As part of the postoptimization evaluation of the optimal design models, such response characteristics as the linear and nonlinear buckling were evaluated under a diverse set of loading conditions with the results showing a similar or superior performance as compared to the baseline model.

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Perry, Thomas, et Zan Miller. « A Study of Jones’ Equation for Buckling of Laminated Composite Cylinders Under External Hydrostatic Pressure ». Journal of Ship Research 37, n^o 03 (1 septembre 1993) : 239–52. http://dx.doi.org/10.5957/jsr.1993.37.3.239.

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A classical solution derived by Jones (1968) is used to evaluate the buckling performance of unstiffened generally orthotropic and quasi-isotropic laminated Graphite/Epoxy (GREP) composite cylinders subjected to external hydrostatic pressure. The results of the analysis are compared to finite-element analysis results. Hydrostatic testing to failure of several 12-ply T300/5208 GREP cylinders demonstrated that the classical buckling solution is quite accurate. The finite-element results showed good agreement with both Jones' solution and test data, with several notable exceptions. Evaluation of strain gage data via Southwell's (1932) method indicates that the test cylinders were fabricated very nearly true. A postiori buckling predictions using Southwell plots all compared quite favorably with the Jones' equation predictions. This work demonstrates that a relatively simple analytical solution can reliably evaluate the performance of composite materials in pressure hull applications.

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Chamis, C. C., et S. N. Singhal. « Coupled Multidisciplinary Simulation of Composite Engine Structures in Propulsion Environment ». Journal of Engineering for Gas Turbines and Power 115, n^o 2 (1 avril 1993) : 300–306. http://dx.doi.org/10.1115/1.2906709.

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A computational simulation procedure is described for the coupled response of multilayered multimaterial composite engine structural components that are subjected to simultaneous multidisciplinary thermal, structural, vibration, and acoustic loading including the effect of hostile environments. The simulation is based on a three-dimensional finite element analysis technique in conjunction with structural mechanics codes and with the acoustic analysis methods. The composite material behavior is assessed at the various composite scales, i.e., the laminate/ply/fiber and matrix constituents, via a nonlinear material characterization model. Sample cases exhibiting nonlinear geometric, material, loading, and environmental behavior of aircraft engine fan blades are presented. Results for deformed shape, vibration frequencies, mode shapes, and acoustic noise emitted from the fan blade are discussed for their coupled effect in hot and humid environments. Results such as acoustic noise for coupled composite-mechanics/heat transfer/structural/vibration/acoustic analyses demonstrate the effectiveness of coupled multidisciplinary computational simulation and the various advantages of composite materials compared to metals.

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Rule, W. K., et G. E. Weeks. « A Hybrid Experimental-Numerical Test Specimen for Laminated Composite Materials ». Journal of Energy Resources Technology 113, n^o 3 (1 septembre 1991) : 193–96. http://dx.doi.org/10.1115/1.2905804.

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A new technique is described for determining all four elastic constants of a lamina from a single laminated specimen of arbitrary, symmetric lay-up. This specimen is subjected to three different loading conditions, and the experimental data is reduced by means of a finite element analysis. The testing procedure for the specimen is relatively easy, which can result in considerable time and cost savings over traditional methods. The new specimen generates biaxial stress states. Thus, the material properties determined from such a configuration may be more appropriate for later use in structural analysis than those determined from traditional specimens with uniform uniaxial stress states.

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Furgiuele, F., et C. Maletta. « Thermo-Mechanical Analysis of Alumina-Zirconia Composites by a Hybrid Finite Element Method ». Mechanics of Advanced Materials and Structures 14, n^o 6 (18 août 2007) : 399–412. http://dx.doi.org/10.1080/15376490701298843.

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Jung, J., B. C. Do et Q. D. Yang. « Augmented finite-element method for arbitrary cracking and crack interaction in solids under thermo-mechanical loadings ». Philosophical Transactions of the Royal Society A : Mathematical, Physical and Engineering Sciences 374, n^o 2071 (13 juillet 2016) : 20150282. http://dx.doi.org/10.1098/rsta.2015.0282.

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In this paper, a thermal–mechanical augmented finite-element method (TM-AFEM) has been proposed, implemented and validated for steady-state and transient, coupled thermal–mechanical analyses of complex materials with explicit consideration of arbitrary evolving cracks. The method permits the derivation of explicit, fully condensed thermal–mechanical equilibrium equations which are of mathematical exactness in the piece-wise linear sense. The method has been implemented with a 4-node quadrilateral two-dimensional (2D) element and a 4-node tetrahedron three-dimensional (3D) element. It has been demonstrated, through several numerical examples that the new TM-AFEM can provide significantly improved numerical accuracy and efficiency when dealing with crack propagation problems in 2D and 3D solids under coupled thermal–mechanical loading conditions. This article is part of the themed issue ‘Multiscale modelling of the structural integrity of composite materials’.

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Giannakis, Efstratios, et George Savaidis. « Structural integrity aspects of a lightweight civil unmanned air vehicle ». International Journal of Structural Integrity 7, n^o 6 (5 décembre 2016) : 773–87. http://dx.doi.org/10.1108/ijsi-11-2015-0055.

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Purpose The purpose of this paper is to focus on the finite element (FE) analyses undertaken for aerodynamically and structurally optimized design of a modern, lightweight civil unmanned air vehicle (UAV) made fully of composite materials. Design/methodology/approach The FE method has been applied to design and calculate the safety factors of all structural elements of the UAV. Fully parameterized design tools have been developed in the preliminary design phase, allowing automatic reshapes of the skin and the internal structural parts, wherever needed, to achieve optimal structural design, from the point of view of lightweight and structural integrity. Monotonic and fatigue tests have been performed on material specimens with various thicknesses and fibre textures, to verify the material properties used for the FE analyses. The load assumptions were in accordance with the valid international standards. Findings The material tests confirmed the validity of the material properties used within the FE calculations. The calculated safety factors were acceptable for all structural elements and components of the UAV. As a result, a lightweight, structurally optimized design has been achieved, considering the international, standardized specifications assumptions and fulfilling the safety requirements. Practical implications Design engineers may use the outcomes of this work as a guide to achieve optimal lightweight structures ensuring its operational strength using composite, lightweight materials. Originality/value A new, structurally optimized, lightweight aircraft design has been developed, able to accommodate heavy electronic payloads while being able to fly for over ten hours without refuelling. This medium altitude long endurance airplane can overview forests, seas and human trafficking autonomously and economically.

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Na, Hyuntae, Seung-Yub Lee, Ersan Üstündag, Sarah L. Ross, Halil Ceylan et Kasthurirangan Gopalakrishnan. « Development of a Neural Network Simulator for Studying the Constitutive Behavior of Structural Composite Materials ». ISRN Materials Science 2013 (7 mars 2013) : 1–10. http://dx.doi.org/10.1155/2013/147086.

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This paper introduces a recent development and application of a noncommercial artificial neural network (ANN) simulator with graphical user interface (GUI) to assist in rapid data modeling and analysis in the engineering diffraction field. The real-time network training/simulation monitoring tool has been customized for the study of constitutive behavior of engineering materials, and it has improved data mining and forecasting capabilities of neural networks. This software has been used to train and simulate the finite element modeling (FEM) data for a fiber composite system, both forward and inverse. The forward neural network simulation precisely reduplicates FEM results several orders of magnitude faster than the slow original FEM. The inverse simulation is more challenging; yet, material parameters can be meaningfully determined with the aid of parameter sensitivity information. The simulator GUI also reveals that output node size for materials parameter and input normalization method for strain data are critical train conditions in inverse network. The successful use of ANN modeling and simulator GUI has been validated through engineering neutron diffraction experimental data by determining constitutive laws of the real fiber composite materials via a mathematically rigorous and physically meaningful parameter search process, once the networks are successfully trained from the FEM database.

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Asiri, Saeed. « Elastic Behavior of Lay-Ups Angles of Laminated Composite Beam with Material Property Grading ». International Journal of Innovative Technology and Exploring Engineering 10, n^o 9 (30 juillet 2021) : 44–51. http://dx.doi.org/10.35940/ijitee.i9301.0710921.

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The article discusses the study of Vibration Analysis of Generally layered Graphite-Epoxy with lay-up [300 /500 /300 /500 ]. The finite element method is utilized in the study, to analyze the effect of lay-up on the natural frequency and comparing the results with the article[1]. Method: The study is done using Ansys. Graphite-epoxy is considered for the study. The model is prepared from SHELL 281 element which is well-suited for composite shells and sandwiched construction. The accuracy in modeling composite shells is governed by the first-order MindlinReissner shell theory. The element has 8 nodes with 6 degrees of freedom at each node translations in the x, y, and z axes, and rotations about the x, y, and z-axes respectively. Finding: The study concludes that the values of natural frequency decreased when increased the difference between angles of lay-up. Novelty/Applications: Vibration Analysis study has been done in aspects, like sandwiched beam in which different materials are sandhwiched in a layer by layer fashion. Many studies also covers composite material with lay-up in great detail, but there is acute study about the comparision of the different lay-up angles at given boundary condition. These articles cover the same at a greater extent, and conclude that the strength and capacity of composite beams can be enhanced not only by blending composites together, but also giving importance to the arrangement of layers of composite materials.

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Zhang, Yujiao, Cheng Yan, Xiongfeng Huang et Yanran Chen. « Structural Design and Mechanical Performance Analysis of Carbon Fiber Closed Fixtures for UHV Transmission Lines ». Mathematical Problems in Engineering 2021 (2 février 2021) : 1–13. http://dx.doi.org/10.1155/2021/6105360.

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The closed clamp is a standard tool for the insulator replacement in ultrahigh voltage (UHV) transmission lines, which is mainly made of titanium alloy material and weighs more than 27 kg that greatly reduces the working efficiency for operators. Due to the lightweight demand, carbon fiber composite materials are applied to design a new type of clamp, in which mechanical properties of new fixtures need to be fulfilled while considering poor impact resistance and low interlaminar shear strength of carbon fiber composite materials. To excavate a high-strength ply structure, finite element progressive damage strength analysis is employed to evaluate the mechanical properties of three different ply angles of the carbon fiber closed fixture, in which Tsai–Wu strength theory is thought as the strength judgment basis for carbon fiber composite materials. After comparison with the displacement-load curves, the three different ply angles fail to meet the strength requirements. So, a carbon fiber laminate structure with an outer cladding for carbon fiber closed fixtures is raised and verified. The analysis results show that the laminate structure meets the strength requirements. Destructive test of the new closed clamp is conducted to verify the correctness of the proposed method, and the weight is reduced by 36.46%.

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Hwang, W. C., et C. T. Sun. « Failure analysis of laminated composites by using iterative three-dimensional finite element method ». Computers & ; Structures 33, n^o 1 (janvier 1989) : 41–47. http://dx.doi.org/10.1016/0045-7949(89)90127-2.

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Brauner, Christian, Axel S. Herrmann, Philipp M. Niemeier et Konstantin Schubert. « Analysis of the non-linear load and temperature-dependent creep behaviour of thermoplastic composite materials ». Journal of Thermoplastic Composite Materials 30, n^o 3 (5 août 2016) : 302–17. http://dx.doi.org/10.1177/0892705715598359.

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Fibre-reinforced thermoplastic composite materials can be manufactured rapidly using a thermoforming process. The assortment of thermoplastic matrix systems is manifold and starts from bulk plastic like polypropylene (PP) up to high-performance systems like polyether ether ketone. High-performance thermoplastic polymers have durable properties but relatively high raw material costs. For structural application, engineering methods are needed to ensure the availability for use over the full range of the life cycle of parts. This equates to at least 15 years under exposure to varying climatic conditions for an automobile component. Bulk plastics have complex viscoelastic behaviour, which means that advanced methods are needed to ensure the long-term behaviour of both the pure plastic or fibre-reinforced materials with such a matrix system. In the following study, the creep behaviour of a glass fibre-reinforced PP material is investigated using different uniaxially loaded creep tests at different load and temperature levels. Starting from this empirical base, two characteristic creep functions are derived using a modified Burgers approach. To transfer the results of uniaxial creep situations to a three-dimensional multiaxial stress state, a method to interpolate the experimental creep curves is presented. This developed creep model is integrated into the implicit non-linear finite element program SAMCEF/Mecano and used to predict the creep behaviour of a complex laminate. The results are then validated against the performed experiments.

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Campaner, Larissa Mendes, Marcos Paulo Motta Silveira, Guilherme Schmitt de Andrade, Alexandre Luiz Souto Borges, Marco Antonio Bottino, Amanda Maria de Oliveira Dal Piva, Roberto Lo Giudice, Pietro Ausiello et João Paulo Mendes Tribst. « Influence of Polymeric Restorative Materials on the Stress Distribution in Posterior Fixed Partial Dentures : 3D Finite Element Analysis ». Polymers 13, n^o 5 (28 février 2021) : 758. http://dx.doi.org/10.3390/polym13050758.

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Background: This study evaluated the effect of interim restorative materials (acrylic resin (AR), resin composite (RC) or polyetheretherketone (PEEK) for dental computer-aided design/computer-aided manufacturing (CAD/CAM)) on the stress distribution of a posterior three-unit fixed partial denture. Methods: The abutment teeth (first molar and first premolar) were modeled using the BioCAD protocol containing 1.5 mm of axial reduction and converging axial walls. A static structural analysis was performed in the computer-aided engineering software, and the Maximum Principal Stress criterion was used to analyze the prosthesis and the cement layers of both abutment teeth. The materials were considered isotropic, linearly elastic, homogeneous and with bonded contacts. An axial load (600 N) was applied to the occlusal surface of the second premolar. Results: Regardless of the restorative material, the region of the prosthetic connectors showed the highest tensile stress magnitude. The highest stress peak was observed with the use of RC (129 MPa) compared to PEEK and AR. For the cement layers, RC showed the lowest values in the occlusal region (7 MPa) and the highest values for the cervical margin (14 MPa) compared to PEEK (21 and 12 MPa) and AR (21 and 13 MPa). Conclusions: Different interim restorative materials for posterior fixed partial dentures present different biomechanical behavior. The use of resin composite can attenuate the stress magnitude on the cement layer, and the use of acrylic resin can attenuate the stress magnitude on the connector region.

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