Academic literature on the topic 'Shells'

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Journal articles on the topic "Shells"

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Wen, Mingzheng, Huaibo Zhang, Shoujun Wang, et al. "Field Investigation on the Coastal Erosion and Progradation Evolution of the Binzhou Shelly Chenier in China: Comparisons between Normal and Typhoon Hydrodynamics." Journal of Marine Science and Engineering 10, no. 6 (2022): 752. http://dx.doi.org/10.3390/jmse10060752.

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The shelly chenier is a dike-like accumulation formed by waves, currents, and other hydrodynamic forces pushing the shells and their debris in the intertidal zone to the high tide line. It is a special type of coastal dike. The shelly chenier located in Wangzi Island of northern Shandong Province is the last well-preserved chenier of the Bohai Bay with natural attributes exposed on the surface. It has unique and irreplaceable attributes among the shell beaches of China. Based on remote sensing interpretation, field investigation, and GPS-RTK (Real-Time Kinematic) measurement, this paper invest
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Flessa, Karl W., Alan H. Cutler, and Keith H. Meldahl. "Time and taphonomy: quantitative estimates of time-averaging and stratigraphic disorder in a shallow marine habitat." Paleobiology 19, no. 2 (1993): 266–86. http://dx.doi.org/10.1017/s0094837300015918.

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We examined the radiocarbon age, taphonomic condition and stratigraphic position of shells of the venerid bivalveChionespp. from the tidal flats of Bahia la Choya, Sonora, Mexico. Shells in Bahia la Choya are time-averaged. Thirty shells yielded radiocarbon dates from modern (A.D. 1950 or younger) to 3569 years before present. The median calendar age of inner flat shells is 483 years; the median age of tidal channel shells is 427 years. We interpret such long shell survival to be the result of frequent shallow burial. Such burial retards bioerosion of shells.The taphonomic condition of shells
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Xuncheng, Guo, Zhang Dongjiang, Feng Xuelei, Qi Qiong, and Zhang Lei. "Modeling Study of Shell Damage to the Typical Light Armored Vehicles." Journal of Physics: Conference Series 2891, no. 4 (2024): 042027. https://doi.org/10.1088/1742-6596/2891/4/042027.

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Abstract This study focuses on the destructive mechanisms and high-precision numerical simulation models of guided shells frequently encountered in combat conditions for damaging light armored vehicles. Based on the modes of shell action and the vulnerability characteristics of light armored vehicles, a systematic analysis of damage patterns was carried out, revealing their destructive effects. Through induction and analysis, a characterization method for the shell’s power field was established. By combining the experimental conditions and data of typical shell damage to steel plates, numerica
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Ayres-Peres, Luciane, Aline Ferreira Quadros, and Fernando L. Mantelatto. "Comparative analysis of shell occupation by two southern populations of the hermit crab Loxopagurus loxochelis (Decapoda, Diogenidae)." Brazilian Journal of Oceanography 60, no. 3 (2012): 299–310. http://dx.doi.org/10.1590/s1679-87592012000300003.

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The present study aimed to comparatively verify the relation between the hermit crabs and the shells they use in two populations of Loxopagurus loxochelis. Samples were collected monthly from July 2002 to June 2003, at Caraguatatuba and Ubatuba Bay, São Paulo, Brazil. The animals sampled had their sex identified, were weighed and measured; their shells were identified, measured and weighed, and their internal volume determined. To relate the hermit crab's characteristics and the shells' variables, principal component analysis (PCA) and a regression tree were used. According to the PCA analysis
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Theis, Christian. "Formation of Twin Clusters in a Galactic Tidal Field." Symposium - International Astronomical Union 207 (2002): 681–83. http://dx.doi.org/10.1017/s0074180900224534.

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The formation of globular clusters is still an unsolved problem. Though most scenarios assume a massive molecular cloud as the progenitor, it is unclear how the cloud is transformed into a star cluster. Here a scheme of supernova (SN) induced cluster formation is investigated. In this scenario the expanding SN shell accumulates the mass of the cloud. This is accompanied by fragmentation resulting in star formation in the shell. If this stellar shell expands sufficiently slowly, its self-gravity leads to a recollapsing shell, thus forming one or several stellar clusters.In this paper N-body sim
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Marwah Ghazi Kareem, Saddam Khalsan Al-Raheem, sadiq emad sadiq, and Luay Sadeq Alansari. "Review of research on the vibration and buckling of functionally graded spherical shells." International Journal of Science and Research Archive 13, no. 2 (2024): 2170–86. https://doi.org/10.30574/ijsra.2024.13.2.2327.

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Spherical shells are important components in many aerospace and engineering structures. A functionally graded material (FGM) spherical shell can have its material distribution varied with the change of the radius direction, which can enhance the bearing capacity and the stability of the thin-walled shells. However, due to the special geometric characteristics of the spherical shell, the simplicity of its geometry will lead to great complexity in its vibration and buckling analysis processes. This paper mainly reviews the previous analytical and numerical research on the vibration and buckling
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Zhang, Shi, Yun Zhang, Zhigao Huang, Huamin Zhou, and Jianhui Li. "The inter-element coupling effect of triangular flat shells." Engineering Computations 32, no. 7 (2015): 1959–80. http://dx.doi.org/10.1108/ec-11-2014-0230.

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Purpose – The purpose of this paper is to study the inter-element coupling effect of membrane and plate components between two adjacent shells occurring on the common boundary. Design/methodology/approach – In this paper, three triangular flat shells developed by combining an excellent membrane element (OPT) with three outstanding plate bending elements (DKT, RDKTM and DST-BK), respectively, are used to study this phenomenon. Benchmark tests are implemented to evaluate the performance of three selected plate elements and the formulated flat shells. Findings – The inter-element coupling effect
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Srichanachaichok, Wiranchana, and Dakrong Pissuwan. "Micro/Nano Structural Investigation and Characterization of Mussel Shell Waste in Thailand as a Feasible Bioresource of CaO." Materials 16, no. 2 (2023): 805. http://dx.doi.org/10.3390/ma16020805.

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Mussel shell waste, which is regularly disposed by households, restaurants, markets, or farms, causes environmental problems worldwide, including in Thailand, because of its long decomposing time. Owing to a large amount of calcium (Ca) content from calcium carbonate (CaCO3) in mussel shell waste, many Thai local businesses grind the shell waste into powder and sell it as a source of Ca. Generally, these powdered waste shells are a mixture of various types of mussel shell waste. In this study, we investigated and characterized powdered mixed waste shells sold in a local Thai market (called mix
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Nurudin, La Ode, Lukas Kano Mangalla, and La Ode Ahmad Barata. "Analisis Karakteristik Biomassa Cangkang Kelapa Dan Kulit Mete Melalui Proses Torefaksi." Enthalpy : Jurnal Ilmiah Mahasiswa Teknik Mesin 7, no. 1 (2022): 28. http://dx.doi.org/10.55679/enthalpy.v7i1.24559.

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In the face of the depletion of fossil fuels, alternative fuels such as biomass are needed. However, biomass has a fairly low calorific value and several other disadvantages compared to petroleum. Therefore, a new breakthrough is needed to correct these weaknesses, one of which is the Torrefaction process. The purpose of this study was to determine the effect of torrefaction of coconut shell and cashew shell biomass on the physical and chemical properties of the material. This research was conducted using coconut shells and cashew shells. The results of this study indicate that the calorific v
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Laidre, Mark E., and Rebecca Trinh. "Unlike terrestrial hermit crabs, marine hermit crabs do not prefer shells previously used by conspecifics." Crustaceana 87, no. 7 (2014): 856–65. http://dx.doi.org/10.1163/15685403-00003320.

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Gastropod shells represent an essential resource for hermit crabs (Decapoda, Anomura). In many cases, hermit crabs acquire used shells from conspecifics who previously occupied the shell. Terrestrial hermit crabs (Coenobita compressus H. Milne Edwards, 1836) strongly prefer used shells. Here we test whether marine hermit crabs (Pagurus samuelis (Stimpson, 1857)) also exhibit a preference for used shells by providing them with matched pairs of (1) a used shell (previously occupied by either the choosing crab itself or by a conspecific) versus (2) a brand new shell (freshly derived from a predat
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Dissertations / Theses on the topic "Shells"

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Scott, Joline L. "Shells." Cleveland State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=csu1285194565.

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Caresta, Mauro Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "Structural and acoustic responses of a submerged vessel." Publisher:University of New South Wales. Mechanical & Manufacturing Engineering, 2009. http://handle.unsw.edu.au/1959.4/44404.

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Excitation of the low frequency vibrational modes of a submerged vessel can generate significant radiated noise levels. Vibrational modes of a submarine hull are excited from the transmission of fluctuating forces through the shaft and thrust bearings due to the propeller rotating in an unsteady fluid. The focus of this work is to investigate the structural and acoustic responses of a submarine hull under axial excitation. The submarine hull is modelled as a cylindrical shell with internal bulkheads and ring stiffeners. The cylindrical shell is closed by truncated conical shells, which in turn
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Loukaides, Evripides George. "Elementary morphing shells." Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/269724.

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Multistable shells are not yet completely understood. Even under the widespread Uniform Curvature (UC) assumption, the limits of this behaviour have not been established and the influence of individual material and geometric parameters has not been described conclusively; this research explores these open questions. In addition, this project was motivated by the need for practical design guidelines and the pursuit of alternative construction and actuation methods for multistable shells. Our analysis is based on an expression for the strain energy of a shell under a set of simplifying assumptio
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McDaniel, James Gregory. "A new higher-order shell theory for vibration and viscoelastically-coated circular cylindrical shells." Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/15825.

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Li, Jian-Min [Verfasser], and Jan [Akademischer Betreuer] Knippers. "Timber shell structures : form-finding and structural analysis of actively bent grid shells and segmental plate shells / Jian-Min Li ; Betreuer: Jan Knippers." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2017. http://d-nb.info/1138234893/34.

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Sadr-Hashemi, Farshid. "Buckling of conical shells." Thesis, University College London (University of London), 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.685403.

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Htet, Aung Thu. "Full-body Shell Creation for CAD Virtual Humans including Tightly-Spaced, Enclosed Shells." Digital WPI, 2017. https://digitalcommons.wpi.edu/etd-theses/1264.

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Computational human models have become essential in several different biomedical and electrical engineering research areas. They enable scientists to study, model, and solve complex problems of human body responses to various external stimuli including electromagnetic and radio-frequency signals. This study describes the algorithms and procedures of creating multi-tissue full-body Computer-Aided Design (CAD) human models. An emphasis is made on full-body shells of variable thicknesses, e.g. skin, fat, and average body container shells. Such shells, along with internal organs, are useful for mu
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Kolahi, Abdolahad Salehi. "Co-rotational methods for small and large strain beams, sheets and shells." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299133.

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Shin, Haksik. "Nonlinear analysis of axisymmetric shells." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0017/MQ58505.pdf.

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Oudmaijer, René Dick. "Evolved stars with circumstellar shells." [S.l. : [Groningen] : s.n.] ; [University Library Groningen] [Host], 1995. http://irs.ub.rug.nl/ppn/141387866.

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Books on the topic "Shells"

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Wallace, Nancy Elizabeth. Shells! shells! shells! Marshall Cavendish, 2006.

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Chatterjee, Binoy Kumar. Theory and design of concrete shells. Chapman and Hall, 1988.

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Hopkins, Therese. Shells. Rosen Pub. Group's PowerKids Press, 2009.

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Richards, Deirdre. Shells. Struik, 1988.

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Claassen, Cheryl. Shells. Cambridge University Press, 1998.

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Bouchet, Philippe. Shells. Abbeville Press, 2008.

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Bouchet, Philippe. Shells. Abbeville Press, 2008.

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John, Mousdale, ed. Shells. Macdonald, 1986.

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Mayer, Cassie. Shells. Heinemann Library, 2006.

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Inc, Dorling Kindersley, ed. Shells. Dorling Kindersley, 1991.

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Book chapters on the topic "Shells"

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Hartmann, Friedel, and Casimir Katz. "Shells." In Structural Analysis with Finite Elements. Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05423-9_6.

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Knoebel, Arthur. "Shells." In Sheaves of Algebras over Boolean Spaces. Birkhäuser Boston, 2011. http://dx.doi.org/10.1007/978-0-8176-4642-4_7.

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Häussler-Combe, Ulrich. "Shells." In Computational Methods for Reinforced Concrete Structures. Wiley-VCH Verlag GmbH, 2014. http://dx.doi.org/10.1002/9783433603611.ch8.

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Petersen, Richard. "Shells." In Beginning Fedora Desktop. Apress, 2018. http://dx.doi.org/10.1007/978-1-4842-3882-0_10.

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Petersen, Richard. "Shells." In Beginning Fedora Desktop. Apress, 2014. http://dx.doi.org/10.1007/978-1-4842-0067-4_11.

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Petersen, Richard. "Shells." In Beginning Fedora Desktop. Apress, 2013. http://dx.doi.org/10.1007/978-1-4302-6563-4_12.

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Hartmann, Friedel. "Shells." In The Mathematical Foundation of Structural Mechanics. Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82401-2_9.

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Poceski, Apostol. "Shells." In Mixed Finite Element Method. Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84676-2_6.

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Gajewski, Antoni, and Michal Zyczkowski. "Shells." In Optimal Structural Design under Stability Constraints. Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2754-4_8.

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Hertz, Kristian Dahl, and Philip Halding. "Shells." In Sustainable Light Concrete Structures. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-80500-5_8.

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Conference papers on the topic "Shells"

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Tzou, H. S. "Distributed Piezoelectric Neurons and Muscles for Shell Continua." In ASME 1991 Design Technical Conferences. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/detc1991-0178.

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Abstract Conventional shell continua are passive, which do not possess any sensation and action/reaction capabilities. In this paper, distributed piezoelectric layers coupled with conventional elastic shell distributed systems are used as distributed “neurons” (sensors) and “muscles” (actuators) for structural monitoring and actuation of shells. New theories on distributed “neural” sensation and actuation of shells are developed based on a generic shell continuum coupled with piezoelectric neurons and muscles. Open and closed loop system dynamic equations are also derived. The system equations
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Amabili, M., and Ye Kurylov. "Nonlinear Vibrations of Cantilever Circular Cylindrical Shells." In ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28484.

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Only experimental studies are available on large amplitude vibrations of cantilever shells. In the present paper, large-amplitude nonlinear vibrations of cantilever circular cylindrical shell are investigated. Shells with perfect and imperfect shape are studied. The Sanders-Koiter nonlinear shell theory, which includes shear deformation, is used to calculate the elastic strain energy. Shell’s displacement fields (longitudinal, circumferential and radial) are expanded by means of a double mixed series: harmonic functions for the circumferential variable; Chebyshev polynomials for the longitudin
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Toorani, M. H., and A. A. Lakis. "Flow-Induced Vibration of Anisotropic Cylindrical Shells." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39029.

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This paper deals with the vibration analysis of anisotropic laminated cylindrical shells conveying fluid. We focus on the axi-symmetric (n=0) and lateral (beam-like, n=1) vibration modes of the anisotropic cylindrical shells. Particularly important in this study is to obtain the natural frequencies of the fluid-structure coupled system and also to estimate the critical flow velocity at which the structure loses its stability. The coupled equations between the shell and the fluid are derived from a refined shell theory by taking into account the shear deformation effects. The displacement funct
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"Saddle Shells." In SP-110: Hyperbolic Paraboloid Shells. American Concrete Institute, 1988. http://dx.doi.org/10.14359/2816.

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Gunes, Recep, M. Kemal Apalak, and H. Abdullah Tasdemir. "Post-Buckling of Functionally Graded Cylindrical Shells." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41301.

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In this study, the post-buckling analysis of functionally graded cylindrical shells was carried out using the non-linear finite element method. The longitudinal shell edges were hinged under a central transverse concentrated load. The shells were composed of ceramic (Al2O3) and metal (Ni) phases and the mechanical properties at the region between the metal and ceramic layers vary continuously through the shell thickness according to a power-law distribution of the volume fractions of the constituents. The arc-length method was implemented. The effects of material composition and layer number a
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Soares, Renata M., and Paulo B. Gonçalves. "Buckling and Nonlinear Analysis of Conoidal Shells." In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59552.

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Slender shell structures described by ruled surfaces have been frequently used in civil engineering and, among these slender shells, conoidal shells are frequently favored as roofing units to cover large column-free areas due to their ease of construction, aesthetic value and structural efficiency. This work studies the nonlinear post-buckling behavior of a conoidal shell, using commercial finite element software ABAQUS®. The problem is geometrically nonlinear due to the shell strong geometric nonlinearity, especially in the case of shallow shells used in practical applications where quadratic
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Amabili, M., and Ye Kurylov. "Nonlinear Vibrations of Circular Cylindrical Shells With Different Boundary Conditions." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10891.

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Large-amplitude nonlinear vibrations of circular cylindrical shells with different boundary conditions are investigated. The Sanders-Koiter nonlinear shell theory, which includes shear deformation, is used to calculate the elastic strain energy. Shell’s displacement fields (longitudinal, circumferential and radial) are expanded by means of a double mixed series: harmonic functions for the circumferential variable; Chebyshev polynomials for the longitudinal variable. Boundary conditions for both simply supported and clamped-clamped shells are exactly satisfied. The Lagrangian approach is applie
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Fujita, Katsuhisa, and Makoto Kato. "Instability of an Axial Leakage Flow-Induced Vibration of Thin Cylindrical Shells Having Freely Supported End." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59491.

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When thin cylindrical shells having freely supported end at the downstream side such as heat-shielding shells of afterburners, labyrinth air seals, annular structures in large diameter pipings and valves are subjected to axial leakage flows, an unstable vibration and a fatigue failure are apt to be occurred. In this paper, the unstable vibration of thin cylindrical shells is analytically investigated considering the fluid structure interaction between shells and fluids flowing through a narrow passage. The coupled equation of motion between shells and fluids is derived using the Flu¨gge’s shel
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Ma, He, Zhiping Chen, Peng Jiao, and Xinyi Lin. "Numerical Study on Buckling Behaviors of Thin-Walled Longitudinal Corrugated Cylindrical Shells Under Axial Compression Loads." In ASME 2022 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/pvp2022-84396.

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Abstract Thin-walled cylindrical shell structures are widely used in various engineering fields due to their highly efficient load carrying capacity. This kind of structures is prone to buckling failure when subjected to axial compression loads. Machining the shell into corrugated shape is an effective method to prevent buckling. Rational design of corrugated shells can improve the load carrying efficiency of shell structures. However, there are few studies focused on the effects of various parameters on the longitudinal corrugated cylindrical shell buckling. In this paper, numerical studies a
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Vaziri, A., H. E. Estekanchi, and H. Nayeb-Hashemi. "Buckling of Cracked Cylindrical Shells With Internal Pressure Subjected to an Axial Load." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32297.

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Cylindrical shells constitute the main structural component in pressure vessels and pipelines. Buckling is one of the main failure considerations when designing these cylindrical shells. Defects such as cracks may develop during manufacturing or service life of these structures. These defects can severely affect their buckling behavior due to high stress field generated around these defects. Finite Element Analyses are performed to study the buckling behavior of cylindrical shells with and without a crack, under various internal pressures. Effects of crack length and its orientation on the buc
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Reports on the topic "Shells"

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Malone, Nathan, Eric Bowes, and Jennifer Hollingsworth. Double Shells! Pbs/CdS/Cu2-xS Core/Shell/Shell Quantum dots. Office of Scientific and Technical Information (OSTI), 2023. http://dx.doi.org/10.2172/2005792.

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Cook, R. Density Measurements of Be Shells. Office of Scientific and Technical Information (OSTI), 2005. http://dx.doi.org/10.2172/15014731.

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Gunther, J., and R. Cook. Chemical Analysis Of Beryllium Shells. Office of Scientific and Technical Information (OSTI), 2005. http://dx.doi.org/10.2172/881070.

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Marshall, S. L., L. Redey, G. F. Vandegrift, and D. R. Vissers. Electroformation of uranium hemispherical shells. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/5274651.

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Cook, R. HOLE DRILLING BREAKTHROUGH IN BE SHELLS. Office of Scientific and Technical Information (OSTI), 2004. http://dx.doi.org/10.2172/15011625.

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Fearon, E. Characterization of Russian ballistic furnace shells. Office of Scientific and Technical Information (OSTI), 1999. http://dx.doi.org/10.2172/8497.

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Ice, G. E., J. S. Chung, and M. Nagedolfeizi. X-ray fluorescence microtomography of SiC shells. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/603700.

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Hidalgo-Hernandez, Ruth G., Paul G. Allison, Brett A. Williams, Luis A. de Bejar, W. S. Hart, and Jason Morson. Structure-Property Relationships of Steel Cylindrical Shells. Defense Technical Information Center, 2012. http://dx.doi.org/10.21236/ada559001.

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Trettel, Daniel, Cheryl Kerfeld, and Cesar Gonzalez Esquer. Dynamic Structural Determinants in Bacterial Microcompartment Shells. Office of Scientific and Technical Information (OSTI), 2024. http://dx.doi.org/10.2172/2377758.

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Cook, B., M. McElfresh, C. Alford, E. Fought, and S. Letts. Attempts to Produce D2-Gas-Filled Be Shells. Office of Scientific and Technical Information (OSTI), 2005. http://dx.doi.org/10.2172/15014506.

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