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Paulos, Yonas Kinfu. "Sedimentation between parallel plates". Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/30055.
Pełny tekst źródłaApplied Science, Faculty of
Civil Engineering, Department of
Graduate
Ho, Wai Yiu. "License Plate Recognition algorithms and their application to Macao license plates". Thesis, University of Macau, 2010. http://umaclib3.umac.mo/record=b2182850.
Pełny tekst źródłaЖигилій, Дмитро Олексійович, Дмитрий Алексеевич Жигилий, Dmytro Oleksiiovych Zhyhylii, Володимир Андрійович Хворост, Владимир Андреевич Хворост i Volodymyr Andriiovych Khvorost. "Laminated composite plates". Thesis, Видавництво СумДУ, 2004. http://essuir.sumdu.edu.ua/handle/123456789/22944.
Pełny tekst źródłaLyrio, Mariana Camilo Negreiros 1980. "Analise mecanica e fotoelastica das tecnica de fixação interna rigida da osteotomia sagital utilizando placa convencional e placa com sistema de travamento em avanços mandibulares". [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287896.
Pełny tekst źródłaDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O propósito neste estudo foi realizar avaliação mecânica e fotoelástica de dois diferentes sistemas de fixação interna rígida (FIR): placas convencionais e placas com sistema de travamento. Para avaliação mecânica foi realizado teste de carregamento linear em réplicas de hemimandíbulas humanas dentadas seccionadas na região de ramo mandibular, representando uma osteotomia sagital, e fixadas com avanço mandibular de 5 mm. No grupo I a fixação foi realizada com placas convencionais e parafusos monocorticais do sistema 2,0mm e no grupo II utilizou-se placas e parafusos monocorticais com sistema de travamento do sistema 2,0 mm. Para análise estatística foram aplicados Anova e teste de Tukey em nível de significância de 5%, os quais demonstraram não haver diferenças entre os grupos I e II nos testes mecânicos. Para os testes fotoelásticos foram confeccionadas hemimandíbulas humanas dentadas em resina fotoelástica, também seccionadas simulando a osteotomia sagital e fixadas com avanço mandibular de 5 mm, com os mesmos grupos utilizados para os testes mecânicos. Em relação à distribuição de tensões, pode-se observar que as mesmas se concentram ao redor dos parafusos, principalmente naqueles próximos à área de osteotomia para ambos os grupos. Dessa forma, pode-se afirmar que os sistemas de fixação utilizando placa e parafusos convencionais ou com sistema de travamento não apresentaram diferenças estatísticas quanto à resistência, e que a maior concentração de forças está nas áreas próximas às osteotomias, consideradas regiões de maior fragilidade após a OSRM.
Abstract: The aim of this study was evaluate the mechanical and photoelastic behavior of two methods of rigid internal fixation (RIF): conventional plates and locking plates. For mechanical tests polyurethane synthetic hemimandible with seccional sagittal ramus split was used, simulating an advancement of 5 mm. The fixation performed on the Group I was a 2.0 mm conventional plates with monocortical screws and fixation used on group II was a 2.0 locking plates with monocortical locking screws. Anova and Tukey tests were applied (P<5) and no statistical differences were noted between the groups. Hemimandibles were made in photoelastic resin with same groups used in mechanical tests and submitted to photoelastical analysis. In relation to tension distribution in photoelastic analysis, the fringes were concentrated around screws, mainly in areas near the osteotomy for both groups. Based in this fact, the conventional and locking fixations systems did not present statistical differences on resistence, and the major forces was concentrated in regions near the osteotomies lines, that considered fragility before sagittal split osteotomy.
Mestrado
Cirurgia e Traumatologia Buco-Maxilo-Faciais
Mestre em Clínica Odontológica
Yin, Jianfei. "Structure-borne sound transmission between isotropic, homogeneous plates and periodic ribbed plates". Thesis, University of Liverpool, 2012. http://livrepository.liverpool.ac.uk/8193/.
Pełny tekst źródłaWaddell, John M. "Scattering from rough plates". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA304997.
Pełny tekst źródłaPrice, Gareth James. "Microchannel plates in astronomy". Thesis, University of Leicester, 2001. http://hdl.handle.net/2381/8638.
Pełny tekst źródłaMartinsson, Johan. "Wear of Grate Plates". Thesis, KTH, Materialvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160603.
Pełny tekst źródłaDenna rapport presenterar en undersökning av slitaget på sidorna av grateplattor som används i gratekilnprocessen i hematitpelletstillverkningen på LKAB i Kiruna, även lösningar presenteras. Plattorna benner sig i en svår miljö med termiska cykler och korrosiva substanser. Utvärderingen av slitaget gjordes i samarbete med LKAB Metlab i Luleå och LKAB mekaniska verkstad i Kiruna. Utrustning som användes var Stereomikroskop, LOM, SEM, Spektroskop, Vickers hårdhetsmätare och ytnhetsmätare. Resultatet visar att sidorna av plattorna utsetts för ett tribokemiskt slitage där toppar av den grova utan slits ner. Ett ytbeläggningstest utfördes på Tribolab, LTU i Luleå, med en SRV. Prover med en beläggning har gnidits mot varandra under tryck och hög temperatur och jämförts med prover utan beläggning som utsattes för samma test. Ytbeläggningen som används står främst emot korrosion, men även slitage, den kallas Diamalloy 4276. Resultatet visar att beläggningen skyddar bra mot slitage, men miljön under testet var för orealistiskt för att med säkerhet kunna säga att det kommer hjälpa i graten. En FEM-modell gjordes med hjälp av COMSOL Multiphysics 4.4 för att beräkna de termiska spänningarna som uppstår mellan ytbeläggningen och metallen. Resultatet visar att spänningar på upp till 1 GPa kommer uppstå, detta kan förklaras med den stora skillnaden i termisk utvidgningskoecient mellan de två materialen. De höga spänningarna kan skapa sprickor i ytan. Två lösningar presenteras, en ytbeläggning rekommenderas inte i dagsläget. Det tribokemiska slitaget kan motverkas genom att förbättra ytnheten. Detta kan antingen utföras genom att bearbeta ytan, med fräsning eller slipning, eller att man byter gjutningsmetod. Idag används manuell formtillverkning, om man istället skulle använda skalformsgjutning eller precisionsgjutning, till exempel Shawprocessen, skulle man få en bättre ytnhet över hela plattan. Detta leder även till bättre korrosionsbeständighet då färre initieringspunkter nns.
Fletcher, Michael. "Plumes, Plates and Porphyries". Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/28474.
Pełny tekst źródłaDatta, Sripati. "Some linear and nonlinear problems of thin elastic plates placed on elastic foundation". Thesis, University of North Bengal, 1999. http://ir.nbu.ac.in/handle/123456789/664.
Pełny tekst źródłaEl-Yabroudi, Joseph A. "A study of the effect of oil added to Toray driographic ink on toning in the non-image areas of Toray company's negative working driographic plates /". Online version of thesis, 1989. http://hdl.handle.net/1850/10434.
Pełny tekst źródłaYuan, Lisha. "Optimum First Failure Loads of Sandwich Plates/Shells and Vibrations of Incompressible Material Plates". Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/102664.
Pełny tekst źródłaDoctor of Philosophy
A simple example of a sandwich structure is a chocolate ice cream bar with the chocolate layer replaced by a stiff plate. Another example is the packaging material used to protect electronics during shipping and handling. The intent is to find the composition and the thickness of the "chocolate layer" so that the ice cream bar will not shatter when dropped on the floor. The objective is met by enforcing the chocolate layer with carbon fibers and then finding fiber materials, their alignment, ice cream or core material, and its thickness to resist anticipated loads with a prescribed level of certainty. Thus, a sandwich structure is usually composed of a soft thick core (e.g., foam) bonded to two relatively stiff thin skins (e.g., made of steel, fiber-reinforced composite) called face sheets. They are lightweight, stiff, and effective in absorbing mechanical energy. Consequently, they are often used in aircraft, aerospace, automobile, and marine industries. The load that causes a point in a structure to fail is called its first failure load, and the load that causes it to either crush or crumble is called the ultimate load. Here, for a fixed areal mass density (mass per unit surface area), we maximize the first failure load of a sandwich shell (plate) under static (dynamic) loads by determining its geometric dimensions, materials and fiber angles in the face sheets, and the number (one or two) of cores. It is found that, for a non-uniformly distributed static pressure applied on the central region of a sandwich shell's top surface, an optimal design that has different materials for the top and the bottom face sheets improves the first failure load by nearly 30%-50% from that of the optimally designed structure with identical face sheets. For the structure optimally designed for the first failure blast load, the ultimate failure load with all of its edges clamped (simply supported) is about 15%-30% (0%-17%) higher than its first failure load. This work should help engineers reduce weight of sandwich structures without sacrificing their integrity and save on materials and cost. Rubberlike materials, polymers, and soft tissues are incompressible since their volume remains constant when they are deformed. Plates made of incompressible materials have a wide range of applications in everyday life, e.g., we hear because of vibrations of the ear drum. Thus, accurately predicting their dynamic behavior is important. A first step usually is determining natural frequencies, i.e., the number of cycles of oscillations per second (e.g., a human heart beats at about 1 cycle/sec) completed by the structure in the absence of any externally applied force. Here, we numerically find natural frequencies and mode shapes of rubber-like material rectangular plates with different supporting conditions at the edges. We employ a plate theory that reduces a 3-dimensional (3-D) problem to a 2-D one and the finite element method. The problem is challenging because the incompressibility constraint requires finding the hydrostatic pressure as a part of the problem solution. We show that the methodology developed here provides results that match well with the corresponding either analytical or numerical solutions of the 3-D linear elasticity equations. The methodology is applicable to analyzing the dynamic response of composite structures with layers of incompressible materials embedded in it.
Elmir, Chady. "Constante systolique et variétés plates". Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2009. http://tel.archives-ouvertes.fr/tel-00439914.
Pełny tekst źródłaSolov'ëv, Sergey I. "Vibrations of plates with masses". Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200601375.
Pełny tekst źródłaCobb, William Geoffrey Carnie. "Optimum holes in flat plates". Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/38262.
Pełny tekst źródłaBellur, Ramaswamy Ravi Shankar. "Optimal design of stiffened plates". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0017/MQ45871.pdf.
Pełny tekst źródłaAhmed, Hesham. "Parametric buckling analyses of plates". Thesis, Oxford Brookes University, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616317.
Pełny tekst źródłaMalagon, Samuel A. "Chladni Figures through Vibrating Plates". Scholarship @ Claremont, 2015. http://scholarship.claremont.edu/cmc_theses/1203.
Pełny tekst źródłaPutra, Azma. "Sound radiation from perforated plates". Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/63161/.
Pełny tekst źródłaJeong, Han Koo. "Reliability of laminated composite plates". Thesis, University of Southampton, 1999. https://eprints.soton.ac.uk/21869/.
Pełny tekst źródłaYeadon, Alan (Alan John Welsford) Carleton University Dissertation Engineering Mechanical and Aerospace. "Axially compressible fracture fixation plates". Ottawa, 1996.
Znajdź pełny tekst źródłaRückert, Jens, i Arnd Meyer. "Kirchhoff Plates and Large Deformation". Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-96896.
Pełny tekst źródłaCHAKRABARTI, SEKHAR KUMAR. "INELASTIC BUCKLING OF GUSSET PLATES". Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184188.
Pełny tekst źródłaLumpp, Dirk Manfred. "An experimental investigation of circular plates, beams and stiffened circular plates subjected to impulsive loading". Master's thesis, University of Cape Town, 1991. http://hdl.handle.net/11427/9658.
Pełny tekst źródłaThis primarily experimental investigation describes a series of experiments on fully-clamped circular plates, rectangular beams and stiffened circular plates. These test specimens were subjected to a uniformly distributed impulse. The impulse was provided by plastic explosive. This was arranged in such a way that a uniformly distributed impulse was imparted to the test specimens. The impulse was measured by means of a ballistic pendulum to which the test specimens were attached. The final mid-point deflections of the plates and beams were measured. The plate and beam results were compared to previous experimental work. A non-dimensional number for plates was modified to include an experimental mass scaling factor due to the ballistic pendulum mass. A non-dimensional number for rectangular beams was developed, including a similar experimental mass scaling factor. Comparing the beam and plate results from this study with those of previous work, using the respective non-dimensional numbers, showed good correlation. The results for the stiffened plates are compared with the plate results.
Jarocha-Ernst, Alex. "Creating landscapes with simulated colliding plates /". Link to online version, 2006. https://ritdml.rit.edu/dspace/handle/1850/1962.
Pełny tekst źródłaMürk, Annely. "Optimization of inelastic plates with cracks /". Online version, 2006. http://dspace.utlib.ee/dspace/bitstream/10062/1226/5/murkannely.pdf.
Pełny tekst źródłaGrytten, Frode. "Low-Velocity Penetration of Aluminium Plates". Doctoral thesis, Norwegian University of Science and Technology, Department of Structural Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-2123.
Pełny tekst źródłaThe present thesis describes research on quasi-static and low velocity perforation of rolled aluminium plates, where the main objective has been to gain a better knowledge of the physical processes taking place during this type of structural problem. The objective has been met by a combination of laboratory tests, material modelling and non-linear finite element simulations.
The thesis is organized in a synopsis, giving a brief introduction to the problem and summarising the main findings and conclusions, in addition to four independent papers.
Paper I presents an experimental technique for measuring the deformations the plate undergoes during impact and perforation. This information can be used to validate numerical models and to increase the understanding of how energy is absorbed by the plate.
Paper II presents an experimental and numerical investigation on the quasi-static perforation of AA5083-H116 aluminium plates. In the tests, square plates were mounted in a circular frame and penetrated by a cylindrical punch. A full factorial design was used to investigate the effects of varying plate thickness, boundary conditions, punch diameter and nose shape. Based on the obtained results, both the main and interaction effects on the maximum force, displacement at fracture and energy absorption until perforation were determined. The perforation process was then computer analysed using the nonlinear finite element code LS-DYNA. Simulations with axisymmetric elements, brick elements and shell elements were conducted. Slightly modified versions of the Johnson-Cook constitutive relation and fracture criterion were used to model the material behaviour. It was shown that the FEM models were able to predict the trends observed in experiments.
Paper III evaluates methods for determination of the anisotropic properties of polycrystalline metallic materials. Four calibration methods were evaluated for the linear transformation-based anisotropic yield function YLD2004-18p (Barlat et al., 2005) and the aluminium alloy AA5083-H116. The different parameter identifications are based on least squares fits to combinations of uniaxial tensile tests in seven directions with respect to the rolling direction, compression (upsetting) tests in the normal direction and stress states found using the full-constraint (FC) Taylor model for 690 evenly distributed strain paths. An elastic-plastic constitutive model based on YLD2004-18p has been implemented in a non-linear finite element code and used in finite element simulations of plane-strain tension tests, shear tests and upsetting tests. The experimental results as well as the Taylor model predictions can be satisfactorily reproduced by the considered yield function. However, the lacking ability of the Taylor model to quantitatively reproduce the experiments calls for more advanced texture models.
Paper IV presents an experimental and numerical investigation on low velocity perforation of AA5083-H116 aluminium plates. In the tests, square plates were mounted in a circular frame and penetrated by a cylindrical blunt-nosed projectile. The perforation process was then computer analysed using the nonlinear finite element code LS-DYNA, in order to investigate the effects of anisotropy, dynamic strain aging and thermal softening in low velocity impacts on the present aluminium alloy. Dynamic strain aging has been shown to influence both the predicted force level and fracture, while thermal softening only influences the fracture prediction. No effect of plastic anisotropy was observed.
Deniz, Tansel. "Ballistic Penetration Of Hardened Steel Plates". Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613534/index.pdf.
Pełny tekst źródłathere is an increasing interest on simulation studies to cutoff these aforementioned costs. This study deals with the numerical modeling of ballistic impact phenomena, regarding the ballistic penetration of hardened steel plates by 7.62 mm AP (Armor Piercing) projectile. Penetration processes of AP projectiles are reviewed. Then, a survey on analytical models is given. After the introduction of fun- damentals of numerical analysis, an intensive numerical study is conducted in 2D and 3D. Johnson Cook strength models for the four different heat treatments of AISI 4340 steel were constructed based on the dynamic material data taken from the literature. It was found that 2D numerical simulations gave plausible results in terms of residual projectile velocities, con- sidering the literature review. Then, 3D numerical simulations were performed based on the material properties that were selected in 2D studies. Good agreement was obtained between the numerical and test results in terms of residual projectile velocities and ballistic limit thick- nesses. It was seen that the ballistic protection efficiency of the armor plates increases with the increasing hardness, in the examined range. This study is a part of T¨
ubitak project 106M211 of MAG.
Mseikeh, Camille Hanna. "Wrinkling of membranes, plates, and shells". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ30343.pdf.
Pełny tekst źródłaSheikh, Imtiaz Ali. "Stiffener tripping in stiffened steel plates". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60496.pdf.
Pełny tekst źródłaOglesby, Keith Andrew. "Acoustic design optimization of thin plates". Thesis, Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/16375.
Pełny tekst źródłaIsrar, Asif. "Vibration analysis of cracked aluminium plates". Thesis, University of Glasgow, 2008. http://theses.gla.ac.uk/261/.
Pełny tekst źródłaDoshi, Nisha. "Colloidal mixtures of spheres and plates". Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.559381.
Pełny tekst źródłaSmith, R. Sean. "Sound transmission through lightweight parallel plates". Thesis, Heriot-Watt University, 1997. http://hdl.handle.net/10399/1290.
Pełny tekst źródłaNkemzi, D. "Dynamics of elastic/viscoelastic sandwich plates". Thesis, University of Nottingham, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334951.
Pełny tekst źródłaLazarus, Kenneth B. "Induced strain actuation of composite plates". Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/41235.
Pełny tekst źródłaSouza, Carlos Eduardo de. "Nonlinear aeroelasticity of composite flat plates". Instituto Tecnológico de Aeronáutica, 2012. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=2243.
Pełny tekst źródłaSimelane, Philemon Sphiwe. "Thermal buckling of laminated composite plates". Thesis, Peninsula Technikon, 1998. http://hdl.handle.net/20.500.11838/1240.
Pełny tekst źródłaHowever, studies were also conducted for the buckling of composite laminates involving temperature distribution. Chen and Chen (1991) studied thermal buckling of laminated plates under uniform and nonuniform temperature distribution using the eight-node Serendipity finite element. Mathew, Singh and Rao (1992) investigated thermal buckling of antisymmetric cross-ply composite laminates with a onedimensional furite element having two nodes and six degrees of freedom. Chandrashekhara (1992) accounted for transverse shear flexibility by using the thermo-elastic version of the first-order shear deformation theory. This will also be the case in this report. Literature on buckling and laminated composites abounds. Brush and Aimroth (1975) published a book on Buckling of Bars, Plates, and Shells, while Bushnell (1985) surveyed the Methods and Modes of Behaviour in Static Collapse. The foundation for the study of composite materials was based on the references [8], [10], [15] and [18]. The use of the Finite Element Method to analyse the buckling behaviour of laminated structures comes from references [I], [4]. [I2]. [16], [24] and [32]. Reference [14] provided the basis for the formulation of the variation of the governing equations. Most of the ideas in this report are based on these publications and references. Chapter I of this report introduces the concept of a composite. the formation of a composite and a brief overview of the elements of a composite material. This chapter also presents the concept of buckling that will form the basis of the development of this project. At the end of this chapter the choice of the element that is used in this study is justified. Chapter 2 provides the fundamentals of elasticity that relate to the deformation of a loaded body. In this Chapter the stresses and strains are defined and the temperature terms are introduced. In Chapter 3 the Mindlin plate theory is presented with a view to laying the foundation for the analysis of laminated plates, and as a starting point in the formulation of thermal buckling behaviour of laminated plates. In Chapter 4 the elements of a composite material are discussed and the constitutive equations of a laminated composite plate are built. Also the idea of lamination is introduced and the various simplifications that can be introduced as a result of lamination are discussed. The non-linear equilibrium equations and the stability analysis of a composite plate are formulated in Chapter 5 using the conventional anal}1ical method. The resulting equations justify the use of the Finite Element Method as introduced in Chapter 6 and it is the method by which the governing equations will be solved in ABAQUS computer analysis. The results for various computer runs are presented for a normal plate, a plate with a square hole, and the plate ""ith a circular cut-out in Chapter 7. Also in chapter 7 a comparison is made between the laminate "ith a central hole and a normal plate to study the effect of a cut-out on a critical buckling temperature. Appendices A deals the transverse shear in plates, and Appendix B deals with the transformation of the laminate elastic constants form the principal material direction to the general Cartesian co-ordinates. Also in Appendix B the laminate stiffness matrices and these matrices are briefly evaluated analytically. Appendix C is about the governing equations of laminated composites, while Appendix D gives a full representation of the abbreviated finite element equations of Chapter 6. Appendix E presents the list of ABAQUS input files that were used in the computer simulation of Chapter 7.
Zafindratafa, Georges. "Autour des sous-variétés conformément plates". Lyon 1, 1992. http://www.theses.fr/1992LYO10093.
Pełny tekst źródłaTian, Haitao. "Taylor meshless method for thin plates". Thesis, Paris, ENSAM, 2019. http://www.theses.fr/2019ENAM0036.
Pełny tekst źródłaA new class of meshless method – Taylor Meshless Method (TMM) - has been introduced that relies on an explicit solution of the Partial Differential Equations inside the domain with the help of Taylor series expansions. Because the PDE is solved analytically in the domain, one is reduced to a discrete boundary problem whose size is rather small.The effectiveness and efficiency of TMM have been verified by solving some partial differential equations. In the cases that have been studied, TMM is robust and effective. For 2D linear problems, one domain is sufficient to solve boundary value problems.TMM is used to solve Kirchhoff plate problems. Techniques in TMM help to reduce the degree of freedoms significantly so that one can increase the degree of the polynomials to a very high level. Laminated sandwich plates are studied by using TMM. Different cases are considered to test the effectiveness and efficiency of the method. The error shows exponential convergence with the increase of degree of polynomials.TMM is combined with asymptotic-numerical method (ANM) to solve large deflection problems of thin plates. The nonlinear equations are expanded in the form of power series, which leads the problem to a series of linear equations. The step length is determined automatically by a reliable path following technique. The accuracy and efficiency of ANM-TMM is verified through these examples and the method can be easily extended to other nonlinear problems.Based on the work of bending problems, the buckling of thin plates are studied. This approach fully takes the advantage of the path following technique. Thus the buckling process can be illustrated much more accurate than that by other methods. The performance of the approach is investigated by a series of benchmark buckling problems.The membrane wrinkling problems are studied. Different tension loads and imperfections are imposed to test their influence on final wrinkle patterns. The results show that TMM can accomplish convergent simulations with very small imperfections and tension loads in comparison with finite element methods. The approach of wrinkled membrane analysis by TMM has been well established
Tiwari, Nachiketa. "Secondary Buckling of Laminated Composite Plates". Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/37789.
Pełny tekst źródłaPh. D.
Wood, Harrison Grant. "Bending and warpage of elastic plates". Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/90576.
Pełny tekst źródłaMaster of Science
This thesis presents two studies on the subject of thin, elastic bodies, otherwise known as plates. Plate theory has important applications in many areas of life, ranging from the design and construction of civil structures to the mechanics of wrinkling sheets. In the first work, we discuss how different elastic plate theories have qualitatively different predictions on how a plate will behave when bent. We discuss the different physical implications of each model, and relate our findings to previous studies. Additionally, we promote the use of certain technical measures in the study of plates corresponding to the most coherent definitions of bending and stretching. In the second work, we study the effects of in-plane swelling gradients on elastic plates whose material stiffnesses vary with direction. Inspired by wood panels that warp when exposed to moisture, we model elastic plates exposed to various swelling patterns and determine the resulting warped shapes. We find that some shapes are axisymmetric, while others prefer to twist when exposed to moisture-induced swelling. By varying certain parameters of the swelling functions, or by increasing the material fiber stiffness, we also find a qualitative change in shape from an axisymmetric to a twisted surface.
Estrada, Beltrán Héctor Andrés. "Ultrasonic transmission through periodically perforated plates". Doctoral thesis, Universitat Politècnica de València, 2011. http://hdl.handle.net/10251/14119.
Pełny tekst źródłaEstrada Beltrán, HA. (2011). Ultrasonic transmission through periodically perforated plates [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/14119
Palancia
Moorthy, Jayashree. "Dynamic instability of composite laminated plates". Thesis, Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/52090.
Pełny tekst źródłaMaster of Science
Da, silva seco Laura. "Column base plates under 3D loading". Thesis, Rennes, INSA, 2019. http://www.theses.fr/2019ISAR0009.
Pełny tekst źródłaColumn bases have a major influence on the stability and stiffness of steel structures. This thesis focuses on the estimation of the resistance of column base plates subjected to a combination of axial force and biaxial bending moment. The investigated connections consist of a steel column welded to a base plate and fixed to the concrete block by means of four anchor bolts. In Chapter II, an extensive literature review is presented, summarizing the existing models for the estimation of the resistance of column base plates as well as the results of previous experimental test campaigns. Chapter III is dedicated to the analysis of the results of a test campaign carried out on 9 column base plates, subjected to in-plane, out-of-plane and bi-axial bending moments. Particular attention is given to the influence of the base plate thickness and orientation of the applied bending moment. Results are presented and discussed, to better understand the elastic and post-limit behaviors. These experimental results are completed with refined numerical simulations presented in Chapter IV. A parametric study is conducted to broaden this investigation, by adding a normal force and other geometrical configurations (column steel profile HEA, IPE, diameter of the anchor bolts). Next, an analytical model is proposed, based on the Component Method in Eurocode 3 Part 1-8, to calculate the resistance of column base plates under uniaxial and biaxial bending moments. The conservative nature of the model is demonstrated by comparing the model predictions against experimental and numerical results
Jowhari, Moghadam Shirin. "Plastic buckling of columns and plates". Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/29865.
Pełny tekst źródłaGuo, Ying. "Investigation of perforated mufflers and plates". Stockholm : Skolan för teknikvetenskap, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10170.
Pełny tekst źródłaGonzález, Diana Maritza Contreras. "Avaliação in vitro da resistência de três tipos de fixação para tratamento de fraturas de ângulo mandibular". Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/58/58136/tde-13042015-093719/.
Pełny tekst źródłaMandibular angle fractures are very frequent among the mandibular fractures and a form of treatment is the use of internal fixation with plates and screws. In this study, the objective was to evaluate the resistance of three types of fixation in mandibular replicas of polyurethane. Sixty three toothed mandibles were used, subject to sectioning simulating a linear and unfavorable fracture of left mandibular angle. The fixations were performed with straight plates system 2.0 mm, prepared as follows: one plate with 4-holes, one 4-holes and extension (bridge) and one plate 3D 4-holes .Each set was submitted for loading test with load application towards in three distinct points of the mandible, so do not simultaneously (molar region on the side ipsilateral of section, the central incisors and contralateral molar) in universal testing machine EMIC DL 2000. Load values were measured at offset 1 mm, 2 mm and 5mm and was noted the final dislocation. The results were submitted to statistical analysis, using analysis of variance (ANOVA), a significance level of 5%. the values obtained showed no statistically significant difference between the plates. The results show that the 3D plate can reproduce similar mechanical scores to the plates used conventionally. It can be concluded that the three types of fasteners behaved similarly.
Williams, Gordon Colin. "An experimental study of instability in square plates twisted by corner forces". Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28527.
Pełny tekst źródłaApplied Science, Faculty of
Mechanical Engineering, Department of
Graduate
Chang, Kao-Liang, i 張國亮. "Vibration Analysis of Plates by Plate-Type Dynamic Vibration". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/88008829251486836923.
Pełny tekst źródła國立中央大學
機械工程學系
86
In this paper,a plate-type dynamic vibration absorber is presented for behaviorof vibration of mainplate under random excitation and impact excitation,which boundary condition is simple supported.This system consists of a dynamic absorbing plate under free boundary condition as the main plate and with uniformly distributed connecting springs and dampersbetween the main and dynamic absorbing plates.By way of defection of mean squareresponse minimum we can obtain optimum frequency ratio, damper ratio,and positionserveral parameters.At lest we use method of steepest decent when main plate underrandom excitation and impact excitation progress in dynamic absorbers analysisand design.The numerical calculations demonstrate the effectiveness the plate-typedynamic absorbers and it can applies for industry.