Bibliografías temáticas / Composite materials. Structural analysis (Engineering) Thermal analysis

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Literatura académica sobre el tema "Composite materials. Structural analysis (Engineering) Thermal analysis"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 18 de febrero de 2022

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Artículos de revistas sobre el tema "Composite materials. Structural analysis (Engineering) Thermal analysis"

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Kiang, H. J. y C. K. H. Dharan. "Analysis of Composite Stretched-Membrane Heliostats". Journal of Solar Energy Engineering 111, n.º 2 (1 de mayo de 1989): 103–11. http://dx.doi.org/10.1115/1.3268294.

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The stretched-membrane concept has the potential for reducing the cost of heliostats used for solar thermal energy generation in central receiver systems. In this concept, a high strength/structural membrane carrying the reflective film is stretched uniformly on a toroidal frame. The resulting structure has high stiffness and is structurally efficient. It is practically suitable for composite materials, since the loading is primarily in-plane. In this paper, the application of composite materials to stretched-membrane heliostat design is investigated. The results of the analysis show that composite materials for both the membrane and the frame exhibit significant advantages over metals. These include high strength-to-weight design, higher resistance to wind-induced deformation, the possibility of independently tailoring bending and torsional stiffness, and better transportability.
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A R, Sreadha y Chitaranjan Pany. "Static, Free Vibration and Buckling Analysis of Composite Panels; A Review". Advanced Journal of Graduate Research 9, n.º 1 (27 de noviembre de 2020): 21–45. http://dx.doi.org/10.21467/ajgr.9.1.21-45.

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A composite material is generally a combination of materials differing in composition or form on a macro scale for the purposes of attaining specific characteristics and properties. The developments in the field of composite materials have granted significant weight reduction in structural design. When compared to metallic materials, composites offer many advantages, especially high strength, stiffness to weight ratio, excellent fatigue properties, and corrosion resistance. Plates, curved panels, the cylindrical shell-shaped forms of models are being broadly used in many structural packages of engineering structure. For design the structure, it is important to know the behaviour of these under static, free vibration, buckling condition. The present paper aims to review the literature on static, free vibration, and buckling analysis of composite flat panel, curved panel, and cylindrical shell. Further, the testing procedure of laminate, design guidelines of laminates and cost estimations with mechanical properties comparison of laminate with metal, CLT (classical lamination theory) basis including thermal and moisture expansion for stiffness evaluation are also summarised in this paper.
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Argyris, John y Lazarus Tenek. "Recent Advances in Computational Thermostructural Analysis of Composite Plates and Shells With Strong Nonlinearities". Applied Mechanics Reviews 50, n.º 5 (1 de mayo de 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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Kalužová, Alena, Jan Pěnčík, Libor Matějka, Libor Matějka, Tomáš Pospíšil y Darina Dostálová. "Analysis of the Effect of Temperature on Thermal Conductivity of the Insulation Block Made from Secondary Raw Materials". Advanced Materials Research 683 (abril de 2013): 242–45. http://dx.doi.org/10.4028/www.scientific.net/amr.683.242.

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The increasing requirements for thermal protection of buildings results in promotion of the development of structural and material design of building facilities. Proper structural design of details then leads to elimination of thermal bridges and to improvement of the indoor environment. Waste management is one of the main features of sustainable construction. The solution of this problem is to extend the product life cycle by recycling. The contribution discusses the development of thermal insulating material block made of secondary raw materials - a thermal insulation composite material - TICM [1]. Uniform dispersion of grains of foamy glass waste (filler) in polymer filling from recycled thermoplastics (PP, HDPE) induces formation of particle composite. Decisive properties in choosing the materials to be applied include mainly the coefficient of thermal conductivity, volume density, compressive strength and water absorption. The coefficient of thermal conductivity λ [W/mK], however, varies depending on surrounding temperature and humidity.
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Jalal, Mostafa y Esmaeel Mansouri. "Thermal and mechanical characteristics of cement nanocomposites". Science and Engineering of Composite Materials 20, n.º 1 (1 de febrero de 2013): 35–40. http://dx.doi.org/10.1515/secm-2012-0053.

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AbstractWidespread applications and advantages of different types of composite materials have drawn researchers’ attention toward the science and technology of composites. Among these materials, cementitious composites have a special place, as they have many applications in various fields of structural and civil engineering. Due to the importance of cementitious composites and their behavior, investigation of their properties is of great importance. Thus in the present study, thermal and mechanical properties of the self-compacting cementitious composites containing different fractions of nano TiO2 have been investigated. Mechanical properties were assessed through compressive, split tensile and flexural tests. The thermal properties were assessed through thermogravimetric analysis (TGA) and conduction calorimetry tests. Accelerated peak appearance in conduction calorimetry tests and more weight loss in thermogravimetric analysis could indicate that TiO2 nanoparticles could lead to strength development at earlier ages and improve the properties of the self-compacting cementitious composites.
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Sathishkumar, GK, G. Rajkumar, K. Srinivasan y MJ Umapathy. "Structural analysis and mechanical properties of lignite fly-ash-added jute–epoxy polymer matrix composite". Journal of Reinforced Plastics and Composites 37, n.º 2 (19 de octubre de 2017): 90–104. http://dx.doi.org/10.1177/0731684417735183.

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The role of lignite fly ash in determining the physical properties of polymer matrix composite is studied in the present investigation. For that, different compositions of polymer matrix composite were prepared using epoxy polymer resin with lignite fly ash and jute fiber in the combination of (90 − x) EP − 10 JF − xLFA (where x = 0, 0.5, 1, 1.5, 2, and 2.5 wt.%) through hand layup technique followed by light compression molding technique. The changes in the physical properties of polymer matrix composite, when fly ash was added, were found to be quite interesting. A linear increase in mechanical strength such as compressive strength, tensile strength, flexural strength, impact energy, and barcol hardness was observed up to the addition of 2 wt.% fly ash content in the polymer matrix composite. Scanning electron microscope image of the composite sample EPJF2.0 showed the distribution of the fly ash, minimal voids, and fiber pullouts presented at the fractured surface. Of all the prepared polymer matrix composites, the sample EPJF2.0 showed a higher mechanical strength and better thermal stability than the other samples.
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Jiang, Jian, Joseph A. Main, Jonathan M. Weigand y Fahim Sadek. "Reduced-Order Modeling of Composite Floor Slabs in Fire. II: Thermal-Structural Analysis". Journal of Structural Engineering 146, n.º 6 (junio de 2020): 04020081. http://dx.doi.org/10.1061/(asce)st.1943-541x.0002607.

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Lu, WT, S. Singh y WS Chan. "A novel stress analysis method for composite Z-stiffeners under mechanical and thermal loads". Journal of Composite Materials 53, n.º 26-27 (8 de mayo de 2019): 3807–18. http://dx.doi.org/10.1177/0021998319846947.

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A closed-form analytical solution is developed for analyzing laminated composite beam with asymmetric Z cross-section. The explicit expressions for evaluating sectional properties such as centroid, shear center, equivalent bending/torsional stiffness and warping stiffness are formulated based upon modified lamination theory and taken into consideration of the structural deformation characteristics of beam with narrow section. The ply stresses of flanges and web laminates are computed for composite Z-stiffener under axial, bending, and torsional loads. The present results give excellent agreement with the results from ANSYS™. A parametric study of their centroid and shear center with various layup sequences was performed by using the developed solution. It is found that the sectional properties are not only dependent of structural configuration but also the laminate property. Moreover, these properties are only dependent of structural configuration if the entire Z-stiffener is made of the same family laminates regardless their ply orientation and stacking sequence. It is concluded that the present approach is a viable and efficient method for designing composite Z-stiffener.
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Zaldivar, Rafael J., D. Marques, C. Barrie y D. Patel. "The effect of radiation exposure on carbon fiber-reinforced Rohacell® core laminate structural composites". Journal of Composite Materials 54, n.º 17 (12 de diciembre de 2019): 2261–69. http://dx.doi.org/10.1177/0021998319893009.

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Two equivalent density foams with identical shear strengths were used to manufacture carbon-fiber reinforced composite sandwich structures. One foam core system (Rohacell® 71 WF) has a cell diameter of 1117 µm and a wall thickness of 29 µm, while the second one (Rohacell® 71 HERO) has cell diameter of 146 µm and a wall thickness of 3 µm. A 60Co source was used to expose composites from 0 to 12 Mrads of radiation. Tests were used to evaluate the effect of radiation on the core shear strength and failure mechanism for both types of composites. The WF composites experienced a 75% decrease in core shear strength, while the HERO only exhibited an 8% decrease. The fracture behavior of the WF composites changed from a more compliant to a brittle fracture path with increased radiation. The fracture modes for the HERO were similar and did not change characteristics, even with maximum radiation dosage. Thermal analysis also showed that even after composite thermal processing, the WF foam retained a lower Tg in comparison to the HERO foam. Dynamic mechanical analyzer also indicated a faster rate of Tg degradation for the WF foam composites as a function of radiation, suggesting a lower degree of crosslinking which resulted in fragmentation of the network. Thermal gravimetric analysis and size exclusion chromatography also exhibited an earlier onset of thermal degradation for the WF foams with radiation. This investigation suggests that changes in composite mechanical properties with radiation are related to both foam macrostructure and the degree of crosslinking of the polymer foam. Careful evaluation must be performed to establish proper selection of the composite core material based on end of life environmental exposure.
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Chamis, C. C. y 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 de abril de 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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Tesis sobre el tema "Composite materials. Structural analysis (Engineering) Thermal analysis"

1

Phillips, John L. "Structural analysis and optimum design of geodesically stiffened composite panels". Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-03122009-040802/.

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Anders, William S. "Structural acoustic analysis of shape memory alloy hybrid composite panels". Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-11012008-063243/.

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Pierce, Matthew Ryan. "Microvascular Heat Transfer Analysis in Carbon Fiber Composite Materials". University of Dayton / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1280944914.

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Kang, Paul J. (Paul Ji Hwan) 1974. "A technical and economic analysis of structural composite use in automotive body-in-white applications". Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/34697.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering; and, (S.M.)--Massachusetts Institute of Technology, Technology and Policy Program, 1998.
Science Library copy in pages.
Includes bibliographical references (leaves 163-170).
by Paul J. Kang.
S.M.
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Hou, An. "Strength of composite lattice structures". Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/12475.

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Singh, Mukti Nath. "Efficient reliability estimation approach for analysis and optimization of composite structures". Master's thesis, Mississippi State : Mississippi State University, 2002. http://library.msstate.edu/etd/show.asp?etd=etd-11072002-103328.

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Stone, Daniel Paul. "The influence of ply orientation on the open-hole tension strength of composite laminates". Online access for everyone, 2008. http://www.dissertations.wsu.edu/Thesis/Spring2008/d_stone_042208.pdf.

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Anghelescu, Mihnea S. "Thermal and Mechanical Analysis of Carbon Foam". View abstract, 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3353337.

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Rantis, Theofanis D. "Probability-based stability analysis of a laminated composite plate under combined in-plane loads". Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07292009-090358/.

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Culler, Adam John. "Coupled Fluid-Thermal-Structural Modeling and Analysis of Hypersonic Flight Vehicle Structures". The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1280930589.

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Libros sobre el tema "Composite materials. Structural analysis (Engineering) Thermal analysis"

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Wu, Kingsley Chauncey. Thermal and structural performance of tow-placed, variable stiffness panels. Amsterdam: IOS Press, 2005.

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Tuttle, M. E. Structural analysis of polymeric composite materials. Boca Raton: CRC Press/Taylor & Francis Group, 2013.

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Structural analysis of polymeric composite materials. New York: Marcel Dekker, 2004.

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A, Miravete, ed. Practical analysis of composite laminates. Boca Raton, Fla: CRC Press, 1995.

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Kalamkarov, Alexander L. Analysis, design, and optimization of composite structures. Chichester, West Sussex, England: J. Wiley & Sons, 1997.

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Introduction to design and analysis with advanced composite materials. Upper Saddle River, N.J: Prentice Hall, 1997.

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Composite structures for civil and architectural engineering. London: E & FN Spon, 1995.

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Tenek, Lazarus Teneketzis. Finite element analysis for composite structures. Dordrecht: Kluwer Academic Publishers, 1998.

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Functionally graded materials: Nonlinear analysis of plates and shells. Boca Raton: Taylor & Francis, 2009.

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The behavior of sandwich structures of isotropic and composite materials. Lancaster, Pa: Technomic Pub. Co., 1999.

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Capítulos de libros sobre el tema "Composite materials. Structural analysis (Engineering) Thermal analysis"

1

Cheung, Hoi-Yan y Kin-Tak Lau. "Thermal Properties of Silk/Poly(Lactic Acid) Bio-Composite". En Experimental Analysis of Nano and Engineering Materials and Structures, 821–22. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6239-1_408.

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Rumianek, Przemysław, Piotr Żach, Radosław Nowak y Piotr Kosiński. "Structural Analysis of PVC-CF Composite Materials". En Lecture Notes in Mechanical Engineering, 619–26. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-04975-1_71.

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Chen, Erh-Chiang y Tzong-Ming Wu. "Crystallization Kinetics and Thermal Behavior of Pcl/Multiwalled Carbon Nanotubes Composites". En Experimental Analysis of Nano and Engineering Materials and Structures, 823–24. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6239-1_409.

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Sit, Moumita, Chaitali Ray y Dhiraj Biswas. "Thermal Stress Analysis of Laminated Composite Plates Using Third Order Shear Deformation Theory". En Advances in Structural Engineering, 149–56. New Delhi: Springer India, 2014. http://dx.doi.org/10.1007/978-81-322-2190-6_14.

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Crowther, D. J., L. D. Favro, P. K. Kuo y R. L. Thomas. "Thermal Wave Detection and Analysis of Defects in Structural Composite Materials". En Review of Progress in Quantitative Nondestructive Evaluation, 481–85. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-2848-7_62.

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Trejo E., E., J. A. García-Hinojosa, M. K. Surappa y E. Rodríguez. "Thermal Analysis and Microstructure Comparison Between A356 Aluminum Alloy and A356/15%vol. SiCP Cast Composite Modified with Strontium". En Advanced Structural Materials III, 47–52. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-446-4.47.

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Li, J. y S. Guo. "Analysis on the thermal decomposition process for the preparation of cobalt-doped zinc oxide from oxalate". En Advanced Materials and Structural Engineering, 103–6. CRC Press, 2016. http://dx.doi.org/10.1201/b20958-23.

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"Finite element vibration analysis of pole structures made of advanced composite materials". En Research and Applications in Structural Engineering, Mechanics and Computation, 357–58. CRC Press, 2013. http://dx.doi.org/10.1201/b15963-166.

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"High-Throughput Synthesis, Deposition and Characterization Techniques". En Advances in Chemical and Materials Engineering, 28–62. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-5225-9896-1.ch002.

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Polyaniline (PANI) has an exclusive representation probably owing to the fact that it has new applications in several fields of nano-technology. It is known for its straightforward synthesis process, high environmental stability and it can be easily doped by different acids. This chapter deals with the synthesis of PANI by several methods in which oxidative polymerization is the simplest and the most highly studied process. The synthesized PANI thin films can be deposited on different substances by a number of chemical and physical-based methods. These PANI thin films have been characterized by different techniques. FTIR and Raman spectroscopy used for structural analysis of synthesized PANI thin films while the crystalline nature determined by X-ray diffraction (XRD). Similarly, SEM, TEM, and AFM have been used for surface analysis of PANI thin films. The thermal and optical characteristics of PANI thin films studied by TGA and optical absorbance spectroscopy, respectively. The cyclic voltammetry (CV) curve gives information about the electrochemical reaction rate and the redox potential of PANI thin films.
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P. V., Rajesh. "MOORA-Driven Decision Making to Select the Optimal Specimen of Organic CMCs". En Advances in Civil and Industrial Engineering, 48–73. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-7206-1.ch005.

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Bone grafting or bone implant is a typical procedure in surgery in which a missing or broken bone is replaced in order to treat bone fractures that pose a significant health risk to the patients. Several research works have been carried out in the past few years regarding various composite materials used in bone implants, their fabrication methods, and evaluation of their physical, mechanical, chemical, and thermal properties. The use of ceramic powders and ceramic-based composites in biomedical applications are steadily increasing over years mainly due to their advantages like high compressive strength, excellent hardness, etc. In this research work, organic ceramic matrix composites with varying proportions of conch shell and sea sponge are fabricated using powder metallurgy technique and their physicomechanical properties such as density, porosity, water absorption, and micro-hardness are evaluated. Finally, optimization of process parameters is done using multi-objective optimization based on ratio analysis (MOORA) to select the best possible specimen of CMCs.
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Actas de conferencias sobre el tema "Composite materials. Structural analysis (Engineering) Thermal analysis"

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Premkumar, P. S., K. R. Aranganayagam, G. Meena, R. Arulpriya, D. Nandhini, R. Kannan y M. Selvambikai. "Structural, optical and thermal analysis of zinc based aerogel composite materials". En PROCEEDINGS OF ADVANCED MATERIAL, ENGINEERING & TECHNOLOGY. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0019396.

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Hu, Haitao, Jun Yan, Baoshun Zhou, Zhixun Yang, Liang Yang y Jiakun Fan. "Thermal and Mechanical Coupled Analysis of Marine Composite Cryogenic Pipeline". En ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96144.

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Abstract Marine composite cryogenic pipeline is one of the key equipment for offshore gas explorations, which is mainly used in the transmission of liquefied natural gas. Due to the harsh marine environment and extreme temperature of transmission medium, the marine composite cryogenic pipeline needs to bear both the tensile and bending loads caused by marine environments and the ultra-low temperature load caused by transmission medium. Due to the extremely low temperature of liquefied natural gas, about −163 °C, the structure and the composed material of cryogenic pipelines will be faced greatly challenges. Previous studies have considered mechanical properties or temperature loading separately. In this research, the structural performance of the marine composite cryogenic pipeline under the combined action of mechanical loads and thermo-load is studied with numerical methods. The framework of the coupled mechanical and thermo-analysis for the structure of composite cryogenic pipeline is established. The numerical results show that the temperature distribution has great impacts on the structural responses of the cryogenic pipeline. The coupled mechanical and thermo analysis of the cryogenic pipeline is proved to be necessary. The established method and framework provide a reference for the engineering design and application of the marine composite cryogenic pipeline.
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Cooley, W. Glenn y Anthony Palazotto. "Finite Element Analysis of Functionally Graded Shell Panels Under Thermal Loading". En ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82776.

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Functionally Graded Materials (FGM) have continuous variation of material properties from one surface to another unlike a composite which has stepped (or discontinuous) material properties. The gradation of properties in an FGM reduces the thermal stresses, residual stresses, and stress concentrations found in traditional composites. An FGM’s gradation in material properties allows the designer to tailor material response to meet design criteria. For example, the Space Shuttle utilizes ceramic tiles as thermal protection from heat generated during re-entry into the Earth’s atmosphere. However, these tiles are prone to cracking at the tile / superstructure interface due to differences in thermal expansion coefficients. An FGM made of ceramic and metal can provide the thermal protection and load carrying capability in one material thus eliminating the problem of cracked tiles found on the Space Shuttle. This paper will explore analysis of shell panels under thermal loading and compare performance of traditional homogeneous materials to FGMs using ABAQUS [1] finite element software. First, theoretical development of FGMs is presented. Second, finite element modeling technique for FGMs is discussed for a thermal stress analysis. Third, homogeneous curved panels made of ceramic and metal are analyzed under thermal loading. Finally, FGM curved panels created from a mixture of ceramic and metal are analyzed. FGM performance is compared to the homogeneous materials in order to explore the effect continuously grading material properties has on structural performance.
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Khanna, S., P. McCluskey, M. Manno, A. Bar-Cohen, B. Yang y M. Ohadi. "Structural Reliability of Novel 3-D Integrated Thermal Packaging for Power Electronics". En ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53749.

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The continual increase of device power and package integration levels has driven the development of advanced power electronics packaging solutions. This study will focus on a numerical modeling approach to design analysis and material selection to improve solder joint reliability in one of these advanced solutions — a thermally integrated power electronics package that aims to dissipate hot-spot heat flux (5 kW/cm2) via mini-contact based thermo-electric (TE) cooling in addition to removing background heat flux (1 kW/cm2) by manifold-microchannel cooling. The methodology used for performing the structural reliability modeling is a non-linear finite element analysis (FEA) approach. Combined thermal and mechanical analyses were run to obtain stresses and strains in the solder joint used to integrate the TE cooler with the mini-contact and the mini-contact with the Silicon Carbide (SiC) chip. To predict the Mean Time to Failure (MTTF) of SAC305 at various levels of integration, a Physics of Failure (PoF) based methodology was applied using Engelmaier’s failure model. In this paper, we will discuss the results of analyses of tapered, t-shaped, and lofted shaped mini-contacts made out of SiC, copper and diamond. Both structural design and material selection affect hot-spot heat dissipation and solder joint reliability. SiC has a good thermal conductivity at room temperature (RT), however, with increase in temperature, its thermal conductivity drops, and this can adversely affect device performance in high temperature applications. On the other hand, one can take advantage of high conductivity materials like copper, diamond or silver-diamond composite to keep the device cool and thus, improve package life time. However, for such high conductivity materials, one will need to take into account the cost of manufacturing complex shapes without any compromise in package thermal or reliability performance. It was found that a ductile mini-contact material will share the thermal mismatch strain with the solder interconnection, while a brittle mini-contact material will shift the failure site inside the TE cooler. It was determined that a mini-contact structure tapered near its top base and lofted (constant cross-sectional area) near the chip (bottom base) would provide the best reliability results. Application of high conductivity composite material (silver-diamond composite) to enhance structural reliability is discussed.
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Tzeng, Jerome T., Ryan P. Emerson y Daniel J. O’Brien. "Viscoelasticity Analysis and Experimental Validation of Anisotropic Composite Overwrap Cylinders". En ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87818.

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Stress relaxation and creep of composite cylinders are investigated based on anisotropic viscoelasticity. The analysis accounts for ply-by-ply variation of material properties, ply orientations, and temperature gradients through the thickness of cylinders subjected to mechanical and thermal loads. Experimental validation of the model is conducted using a high-tensioned composite overwrapped on a steel cylinder. The creep and stress relaxation response of composite is accelerated at elevated temperatures, then characterized and compared to the model simulation. Fiber reinforced composite materials generally illustrate extreme anisotropy in viscoelastic behavior. Viscoelastic effects of the composite can result in a drastic change of stress and strain profiles in the cylinders over a period of time, which is critical for structural durability of composite cylinders. The developed analysis can be applied to composite pressure vessels, gun barrels, and flywheels design of life prediction.
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Xie, Gongnan, Jian Liu, Weihong Zhang y Bengt Sunden. "Simulation and Thermal Analysis on Temperature Fields During Composite Curing Process in Autoclave Technology". En ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-85918.

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Autoclave process is a widely-used method of composite materials manufacturing. The uniformity of temperature fields during the composite curing process has an important effect on the component and then product quality. Previous simulations on composite curing temperature field had some limitations, because either in the thickness direction of thick composite component or under a rather simple external environment was only considered into the simulations, thereby leading to deviations from the actual composite curing process. In this study, taking into considerations of factors such as auxiliaries, mold and forced convection phenomenon inside autoclave, a refined simulation method has been established on composite curing temperature field in autoclave technology. On this basis, simulation and thermal analysis of the curing temperature field with regard to composite structure and material system in the aviation industry have been performed. The variables such as the time of heat preservation, heating rate are also controlled, so that the improvements of heating efficiency and uniformity of temperature field are achieved.
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7

Siegmund, Thomas y Ashwin Hattiangadi. "Quantitative Photothermal NDE of Composites: Numerical Analysis". En ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33865.

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Photothermal non-destructive evaluation (NDE) of solids is a powerful method to detect subsurface cracks, inclusions and delaminations. To fully explore the use of this method, and to expand its capabilities a quantitative measurement model is required. Such a model provides the link between the actual damage processes in the material or structure under investigation and the measurement system response. In the proposed paper a numerical simulations of the photothermal non-destructive evaluation of unidirectionally reinforced composite materials. In the investigation, special focus is placed on the description of the interaction of the thermal field with the delamination to be detected. The model consists of two main parts: (1) a probabilistic crack advance and crack bridging model embedded in a full field solution of the actual loaded structure, and (2) a model describing the thermal characteristics of the bridged delamination in dependence of the loading state and the probabilistic fiber failure model. The paper will describe results on computationally predicted thermal response data in dependence of the type and magnitude of the applied loading for the case of ceramic matrix composite materials.
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8

Stacey, Jonathan P., Matthew P. O’Donnell y Mark Schenk. "Thermal Prestress in Composite Compliant Shell Mechanisms". En ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-85826.

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Due to the anisotropic nature of fibre-reinforced laminates, thermally-induced internal stresses can remain in the material after manufacture. Mismatches between coefficients of thermal expansion are especially prominent in thin shells with fewer plies or large angle variations. Such stresses cause out-of-plane warping and are therefore often deliberately avoided. Utilising their effects on structural behaviour however, can enable stiffness-tailored composite compliant mechanisms. Work detailed in this paper aims to exploit thermal prestress to reduce the torsional stiffness of cross-ply tape laminate springs. An extension of an analytical tape spring model with composite thermal analysis is presented, which shows that thermal effects cause significant changes to the energy landscapes of thin composite shells. Tape springs that would otherwise be monostable structures become bistable and exhibit greater ranges of low-energy twisting when thermally-induced prestress is present. Predicted shell geometries are compared with finite element models and manufactured samples, showing good agreement between all approaches. The limited feasibility of zero torsional stiffness composite tape springs is discussed, as well as wider challenges involved in manufacturing prestressed composite compliant mechanisms such as fibre misalignment and moisture ingress.
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9

Nakai-Chapman, J., Y. H. Park y J. Sakai. "Progressive Fatigue Life Prediction of Composite Materials Based on Residual Material Property Degradation Model". En ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21595.

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Abstract Anisotropic composite materials have been extensively utilized in mechanical, automotive, aerospace and other engineering areas due to high strength-to-weight ratio, superb corrosion resistance, and exceptional thermal performance. As the use of composite materials increases, determination of material properties, mechanical analysis and failure of the structure become important for the design of composite structure. In particular, the fatigue failure is important to ensure that structures can survive in harsh environmental conditions. The non-homogeneous character of composites induces diverse failure modes of the constituent including fiber fracture, matrix cracking, fiber-matrix interface failure, and delamination. Non-homogeneity of composite materials makes their fatigue behavior very complex in comparison with traditional engineering materials. In this study, a progressive damage theory is extended to simulate fatigue failure of composite laminates under fatigue loading conditions. A residual material property degradation model was employed to predict fatigue damage due to arbitrary stress ratio without performing excessive quantities of testing. This generalized residual material property degradation rule is implemented into user subroutine USDFLD in ABAQUS through which material degradation states are updated over the progressive fatigue loading. The present computational method is verified by comparing the simulated results with the experimental data available in the literature.
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Peroni, Lorenzo, Massimiliano Avalle y Marco Peroni. "The Mechanical Behaviour of Aluminium Foam Structures in Different Loading Conditions". En ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95704.

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Foams are one of the best solutions for energy absorption enhancement. Many types of materials can be produced in the form of foams, including metal and polymers. Among metal foams, the most advanced are aluminum based. They couple lightweight with good properties, not only mechanical, but also, for example, good thermal stability. Among the various aspects still to be investigated regarding their mechanical behavior, there is the influence of a hydrostatic state of stress on yield. Unlike metals, the hydrostatic component affects yields. Therefore different loading conditions have to be considered to fully identify the material behavior. Another important issue in foam structure design is the analysis of composite structures. To this purpose an aluminum foam has been examined (FOAMINAL, provided by IFAM within the 6th Framework Programme European Project APROSYS). The material behavior has been investigated by subjecting the foam to different stress state conditions (uniaxial, hydrostatic, pure deviatoric, and various combinations). Results obtained in various kinds of test will be presented: uniaxial compression, in quasi-static and dynamic conditions loading the components into a SHPB device, tension, bending, and shear loading. Moreover, composite structures were made by assembling the foam into aluminum cold extruded closed section tubes (in 6060 aluminum). All the results show that the energy absorption capability of the composite structures is much greater than the sum of the energy absorbed by the two components, the foam and the tube.
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