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Dissertations / Theses on the topic 'Buckling (Mechanics)'

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Published: 4 June 2021

Last updated: 30 July 2024

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1

Liu, Jia. "Buckling Induced Functionality in Soft Structures." Thesis, Harvard University, 2016. http://nrs.harvard.edu/urn-3:HUL.InstRepos:33493413.

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A variety of instabilities can be triggered when elastic structures are subjected to mechanical loadings. While such instabilities have traditionally been considered as a failure, a new trend is emerging in which the dramatic geometric changes induced by them are harnessed to enable new functionalities. In this thesis, I report a systematic study on the morphology and functionality changes induced by buckling in soft structures. Using a combination of theoretical, numerical and experimental analyses, I investigate the non-linear response of a variety of one dimensional, two dimensional and three dimensional systems, with particular emphasis on their stability. The results show that the deformation induced by buckling can be rather complex even if the undeformed geometry is simple. Moreover, I demonstrate that a wide range of morphologies can be obtained by carefully controlling the geometric, material and loading parameters. Such tunability may open venues for the design of structures with adaptive and switchable properties.
Engineering and Applied Sciences - Engineering Sciences

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2

Zhang, Qiuting. "Mechanics and Functionality of Extreme Mechanical Instabilities through Buckling Driven Delamination." Diss., Temple University Libraries, 2019. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/587760.

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Mechanical Engineering
Ph.D.
Mechanical instabilities such as wrinkling and buckling-driven delamination in thin film-substrate systems have historically been considered as one of structural failure mechanisms, which should be avoided. The past decade has witnesssed rapid growth in harnessing such surface instabilities for a wide range of tunable surface related properties and functionalities, especially in soft materials on small scales. Compared to extensively studied wrinkling on soft substrates and localized buckling driven delamination on stiff substrates, the fundamental mechanics underpinning ordered buckle-delamination on soft substrate over large area and its guidance for potential implications in engineering innovation remain largely to be explored. This thesis aims to partially bridging such a knowledge gap. In this thesis, I exploit how to generate the controllable and globally periodic delaminated buckling patterns in thin films on highly prestrained elastomeric substrates, and then explore the fundamental mechanics of this spontaneous extreme buckling driven periodic delamination, as well as its implications in design of extremely stretchable electronics and interfacial mechanical properties measurement. Compared to wrinkling, one of the benefits of extremely buckling driven delamination is the extraordinarily high aspect ratio of buckles. The large surface roughness and high local curvature could potentially enable extreme surface topographies related properties, such as adhesion, wetting, friction, and optics, as well as augment the extreme stretchability in stretchable optical and electronic devices. In the aim of harnessing this extreme buckling driven delamination, I first explore the formation and evolution of extraordinarily high-aspect-ratio delaminated buckles of thin films on 400% pre-strained elastomers, as well as uncovered the underlying deformation mechanism through combining quantitative theoretical analysis and experimental and numerical approaches. A theoretical framework is developed to describe the formation and evolution process of periodic delaminated buckles, which includes three deformation stages, i.e. onset of localized blisters (Stage I), growth and propagation of delamination (Stage II), and post-buckling after delamination arrest (Stage III). I show that under extreme large compressive strain, the profile of periodic blisters changes from sinusoidal shape to jig-saw-like shape with relative high aspect ratio, which have potential applications for design of extremely stretchable electronics. Equipped with the fundamental mechanics of buckle-delamination in thin films, I then exploit harnessing the spontaneous buckling driven periodic delamination to achieve high stretchability in both metal and silicon films. Experimentally I observe periodic buckle-delaminated patterns over large area, accompanied by highly ordered transversely cracking patterns, which can be theoretically predicted by simple crack fragments model. I hypothesize that when the width of ribbons is set to be equal or smaller than the theoretically predicted crack fragment width, there would be no cracking fragmentation. This criteria for designing crack-free micro-ribbons is further validated by related experiments. Guided by the validated criteria, I successfully design crack-free and spontaneous delaminated ribbons on highly prestrained elastomer substrates, which provides a high stretchability of about 120% and 400% in Si and Au ribbons, respectively. I further extend the buckling instability-based metrology to systematically measure the mechanical properties of 2D organic conjugated polymer nano-films, which have tremendous promising applications in organic integrated circuits, solar cells, and stretchable devices. I develop a new fabrication strategy to generate buckle-delaminated free-standing organic conjugated polymeric (P3BT/C60) nanosheets. Through both experiments and theoretical analysis, I show that the free-standing buckle-delaminated organic P3BT/C60 nanosheets have significant advantages over the traditional spin-coated wrinkled nanosheets, including the enhanced mechanical properties, a higher level of stretchability with lower electrical resistance, and a wider range of controllable wettability modulation.
Temple University--Theses

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3

Alur, Kashyap. "Nonlinear mechanics of composite materials." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53600.

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Composite materials have been an area of active research in recent years due to the possibility of obtaining multifunctional structures. Viscoelastic layered composites with parallel plane layers consisting of a stiff constituent and a soft viscoelastic constituent are of particular interest as they have been shown to exhibit simultaneous high stiffness and high damping. Such materials would be useful in structural applications and in high vibration environments such as in a vehicle or machinery. They would provide the rigidity required while simultaneously dissipating mechanical energy. The finite deformation mechanics of parallel plane viscoelastic layered composites has not been extensively studied. Under compressive loads they are very susceptible to instabilities. Buckling, for example is an elastic instability seen in load bearing materials. Since viscoelastic materials are rate and time dependent, the buckling modes for these composites not only depend on these factors, but also on the volume fraction of the stiff constituent. Three different cases are identified in the buckling and post-buckling response of these composites: non-dilute (high volume fraction), transition (intermediate volume fraction) and dilute (small volume fraction) cases. Due to buckling from the application of prestrain, the stiffness and damping of these composites can be tuned by orders of magnitude. Adaptive and multifunctional materials can be designed taking advantage of this idea and the rate dependence of the modes of deformation.

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4

Mehta, Paras. "Asymptotic post-buckling analysis by Koiter's method with a general purpose finite element code." Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-06082009-170924/.

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5

Li, Hong. "Experimental micromechanics of composite buckling strength." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/11719.

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6

Yang, Yongchang 1965. "Elastic-plastic buckling of infinitely long plates resting on tensionless foundations." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100237.

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There is a class of plate buckling problems in which buckling occurs in the presence of a constraining medium. This type of buckling has been investigated by many researchers, mainly as buckling of elastic columns and plates on elastic foundations. Analytical solutions have been obtained by assuming the foundation to provide tensile as well as compressive reaction forces. The present work differs from the previous ones in two respects. One, the foundation is assumed to be one-sided, thus providing only the compressive resistance. Two, the plates are allowed to be stressed in the plastic, strain-hardening range. Equations for determining the buckling stresses and wavelengths are obtained by solving the differential equations for simply supported and clamped long rectangular plates stressed uniformly in the longitudinal direction. The relevance and the usefulness of the obtained formulas is demonstrated by comparing the predicted results with the experimental results of other researchers on buckling of concrete filled steel box-section and HSS columns. It is shown that the theoretical buckling loads match quite closely with the experimental ones, and hence, should prove useful in formulating rules for the design of such columns.

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7

Jane, Kuo Chang. "Buckling, postbuckling deformation and vibration of a delaminated plate." Diss., Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/19975.

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8

Burrell, Geoffrey Scott. "Distortional buckling in steel I-girders." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 143 p, 2007. http://proquest.umi.com/pqdweb?did=1338867451&sid=1&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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9

Lee, Seungsik. "Flexural-torsional buckling of pultruded T-sections." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/19496.

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10

Paspuleti, Suma. "Mechanical and thermal buckling of thin films." Diss., Columbia, Mo. : University of Missouri-Columbia, 2005. http://hdl.handle.net/10355/4302.

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Thesis (M.S.)--University of Missouri-Columbia, 2005.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (July 14, 2006) Includes bibliographical references.

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11

Yoon, Soon Jong. "Local buckling of pultruded I-shape columns." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/20118.

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12

Achenbach, Mark R. "Design optimization of blade stiffened laminated composite plates for maximum buckling load." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA241651.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, December 1990.
Thesis Advisor(s): Shin, Phillip Y. "December 1990." Description based on title screen as viewed on March 28, 2010. DTIC Descriptor(s): Thickness, optimization, layers, laminates, finite element analysis, height, stiffening, orientation(direction), blades, solutions(general), buckling, equations, fibers, loads(forces) DTIC Identifier(s): Design optimization, laminates, blade stiffened plate, buckling Author(s) subject terms: Design optimization, blade stiffened plate, buckling Includes bibliographical references (p. 81-84). Also available in print.

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13

Wang, Qishan. "Active vibration and buckling control of piezoelectric smart structures." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114328.

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The objective of this dissertation is the vibration and buckling control of piezo-laminated composite structures with surface bonded or embedded piezoelectric sensors and actuators by using the finite element analysis and LQR/LQG feedback control techniques. The focus is mainly on two aspects: the finite element part and the active control part. (1) The finite element part:Two finite element formulations for the piezo-laminated beams based on the classical Bernoulli-Euler and the Timoshenko beam theories are developed using the coupled linear piezoelectric constitutive equations, and the Hamilton variation principle. A C0 continuous, shear flexible, eight-node serendipity doubly curved shell element for the piezo-laminated composite plates and shells is also developed based on the layer-wise shear deformation theory, linear piezoelectric coupled constitutive relations, and Hamilton variation principle. The developed elements can handle the transverse shear strains, composite materials, and piezoelectric-mechanical coupling. Higher modes of vibration can then be predicted more precisely for thin to medium-thick multi-layered composite structures. They are evaluated both for the vibration and buckling of beam, plate, and shell structures. (2) The active control part: The suppression of vibration of a cantilever piezo-laminated beam and the control of the first two buckling modes of a simply supported piezo-laminated beam are studied first. Then, the vibration and buckling control of a cantileverpiezo-laminated composite plate are studied. Furthermore, the vibration control of a piezolaminated semicircular cylindrical shell is also studied. The results of the finite element analysis are used to design a linear quadratic regulator (LQR) controller and a linear quadratic Gaussian (LQG) compensator with a dynamic state observer to achieve all the controls. The control design begins with an approximate reduced modal model which can represent the system dynamics with the least system modes. A state space modal model of the smart structure which integrates the host structure with bonded piezoelectric sensors and actuators, is then used to design the control system. The designed LQR/LQG feedback controls are shown to be successful in suppressing the vibration and stabilizing the buckling modes of structures. Both the finite element analysis and the active control simulation results are consistent with the existing theoretical analysis results and the experimental data in the literature. Some important conclusions and interesting observations are obtained.
L'objectif de cette thése est le contrôle de la vibration et de flambage à l'aide de l'analyse par éléments finis et LQR/LQG technologies de contrôle de rétroaction pour les structures composites stratifiées piézo-électriques qui sont liés ou incorporés de surface de capteurs et d'actionneurs piézoélectriques. Il ya principalement deux parties ciblées. La partie des éléments finis : Deux formulations éléments finis pour les poutres laminées piézo-basé sur le classique d'Euler-Bernoulli et la théorie des poutres de Timoshenko, respectivement, linéaires couplées piézoélectriques équations constitutives, et le principe de variation de Hamilton sont développés. Un C0 continue, cisaillement flexible, à huit nuds élément de coque à double courbure sérendipité pour les plaques piézocomposites stratifiés et de coquillages est également dérivée basée sur la théorie de la couche-sage déformation de cisaillement, linéaires piézo-électriques couplés relations constitutives mécaniques, et le principe de variation de Hamilton. Toute la poutre, plaque, et des éléments de coque développés ont considéré la rigidité, de masse et les effets de couplage électromécanique du capteur piézo-électrique et les couches de l'actionneur. Les éléments de structure développéssont capables de traiter les effets non linéaires de déformation en cisaillementtransversal et la non-linéarité des matériaux composites, piézoélectrique-mécanique d'accouplement, et peut prévoir plus précisément les modes supérieurs de vibration, et peut être appliquée à partir de minces d'épaisseur moyenne structures composites multicouches. Ils sont évalués à la fois les vibrations et analyse de flambage de la poutre, plaque, et structures en coque. La partie de commande actif : La vibration de supprimer d'un porte à faux piézo-collé poutre, les deux premiers modes de flambement contrôle d'un appui simple piézo-collé poutre, et la vibration et le flambage contrôle de la charge d'un cantilever piézoélectrique stratifié plaque composite sont étudiés. Les résultats de l'analyse par éléments finis sont utilisés pour concevoir un régulateur linéaire quadratique (LQR) contrôleur et un linéaire quadratique gaussienne (LQG) compensateur avec un observateur d'état dynamique pour atteindre toutes les commandes. Les conceptions de commandes commencent par une méthode modale modle pour déterminer un modle modal réduit approximative qui peut représenter la dynamique du systme avec les modes les moins systme inclus. Un modle modal espace d'état de la structure intelligente qui a intégré la structure d'accueil d'colléscapteurs et d'actionneurs piézoélectriques, est ensuite utilisé pour concevoir le systme de contrôle. Les contrôles visant commentaires LQR/LQG sont avérés succs dans la suppression de la vibration et de stabiliser les modes de flambement des structures. Tant l'analyse par éléments finis et les résultats de simulation de contrôle actives sont compatibles avec les résultats existants d'analyse théoriques et les données expérimentales de la littérature. Quelques conclusions importantes et des observations intéressantes sont obtenues.

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14

Singhatanadgid, Pairod. "Buckling of composite plates subjected to biaxial loading /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/7067.

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15

Shin, Yung S. "Optimal structural design for maximum buckling load." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/77835.

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Structural optimization was performed by either mathematical programming methods or optimality criteria methods. Both types of methods are based on iterative resizing of structures in the expectation that it will lead to the satisfaction of optimality conditions. Recent developments in methods for solving nonlinear equations gave a way to an alternative approach in which the optimality conditions are treated as a set of nonlinear equations and solved directly. Two different formulations are presented; one is a conventional nested approach and the other is a simultaneous analysis and design approach. Two procedures are explored to solve the nonlinear optimality conditions; a Newton-type iteration method and a homotopy method. Here, the homotopy method is adapted to the optimal design so that we can trace a path of optimum solutions. The solution path has several branches due to changes in the active constraint set and transitions from unimodal to bimodal solutions. The Lagrange multipliers and second-order optimality conditions are used to detect branching points and to switch to the optimum solution path. This study specifically deals with buckling load maximization which requires highly nonlinear eigenvalue analysis and the procedure is applied to design of a column or laminated composite plate structures. A formulation to obtain multimodal solutions is given. Also, a special property in a laminate bending stiffness is found. That is, for a given stacking sequence of ply orientations, we showed an existence of a design with the same bending stiffness matrix and same total thickness even when the stacking sequence is changed.
Ph. D.

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16

Olmedo, Reynaldo A. "Compression and buckling of composite panels with curvilinear fibers." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-08142009-040516/.

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17

Radloff, Harold David. "Buckling response of symmetrically laminated composite plates having a trapezoidal planform area." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06112009-063507/.

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18

Ma, Ming. "Elastic and inelastic analysis of panel collapse by stiffener buckling." Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06062008-170150/.

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19

Yilmaz, Suphi. "Buckling Driven Delamination Of Orthotropic Functionally Graded Materials." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/3/12607836/index.pdf.

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In today'
s technology severe working conditions increase demands on structural materials. A class of materials which are developed to meet these increased demands is Functionally Graded Materials (FGMs). These are inhomogeneous structural materials which are able to withstand large temperature gradients and corrosive environment. Application areas of FGMs are in aerospace industry, nuclear reactors, chemical plants and turbine systems. FGMs have gradual compositional variation from metal to ceramic which give them mechanical strength, toughness and heat resistance. However under high temperature gradients, cracking problems may arise due to thermal stresses. In layered structures the final stage of failure may be delamination due to crack extension. The objective of this study is to model a particular type of crack problem in a layered structure consisting of a substrate, a bond coat and an orthotropic FGM coating. There is an internal crack in the orthotropic layer and it is perpendicular to material gradation of coating. The position of the crack inside the coating is kept as a variable. The steady-state temperature distribution between the substrate and the coating causes a buckled shape along crack face. The critical temperature change, temperature distribution, mixed mode stress intensity values and energy release rates are calculated by using Displacement Correlation Technique. Results of this study present the effects of geometric parameters such as crack length, crack position, etc as well as the effects of the type of gradation on buckling behavior and mixed mode stress intensity factors.

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20

Wang, Xiaobo Elgaaly Mohamed. "Behavior of steel members with trapezoidally corrugated webs and tubular flanges under static loading /." Philadelphia : Drexel University, 2003. http://dspace.library.drexel.edu/handle/1721.1/98.

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21

CHAKRABARTI, SEKHAR KUMAR. "INELASTIC BUCKLING OF GUSSET PLATES." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184188.

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The strength and behavior of gusset plates in buckling is evaluated herein based on data from the experimental investigations conducted by other researchers and the analytical work presented herein. A set of design guidelines has been recommended through the review of the current practice. Representative single and double brace gusset plates normally adopted for connections with compressive bracing/diagonal members in braced frames and trusses, were modeled and analyzed using linear and nonlinear finite element methods to determine the buckling loads. The buckling analysis data along with the test data indicated the occurrence of inelastic buckling of the gusset plates. Current design practice and a set of formulas for determination of gusset plate thickness have been reviewed. A set of guidelines has been recommended for the design and evaluating gusset plate buckling loads.

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22

MacLaurin, James Normand. "The buckling of capillaries in tumours." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:ba252220-3c06-4d49-8696-655f6fefcd31.

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Capillaries in tumours are often severely buckled (in a plane perpendicular to the axis) and / or chaotic in their direction. We develop a model of these phenomena using nonlinear solid mechanics. Our model focusses on the immediate surrounding of a capillary. The vessel and surrounding tissue are modelled as concentric annulii. The growth is dependent on the concentration of a nutrient (oxygen) diffusing from the vessel into the tumour interstitium. The stress is modelled using a multiplicative decomposition of the deformation gradient F=F_e F_g. The stress is determined by substituting the elastic deformation gradient F_e (which gives the deformation gradient from the hypothetical configuration to the current configuration) into a hyperelastic constitutive model as per classical solid mechanics. We use a Blatz-Ko model, parameterised using uniaxial compression experiments. The entire system is in quasi-static equilibrium, with the divergence of the stress tensor equal to zero. We determine the onset of buckling using a linear stability analysis. We then investigate the postbuckling behaviour by introducing higher order perturbations in the deformation and growth before using the Fredholm Alternative to obtain the magnitude of the buckle. Our results demonstrate that the growth-induced stresses are sufficient for the capillary to buckle in the absence of external loading and / or constraints. Planar buckling usually occurs after 2-5 times the cellular proliferation timescale. Buckles with axial variation almost always go unstable after planar buckles. Buckles of fine wavelength are initially preferred by the system, but over time buckles of large wavelength become energetically more favourable. The tumoural hoop stress T_{ThetaTheta} is the most invariant (Eulerian) variable at the time of buckling: it is typically of the order of the tumoural Young's Modulus when this occurs.

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23

Merchant, Anwar A. "Least square parabola applied to buckling of concrete plates." Thesis, Kansas State University, 1986. http://hdl.handle.net/2097/9937.

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24

Lee, Ho Hyung. "Postbuckling failure of composite plates with central holes." Diss., This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-10022007-145159/.

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25

Grall, Bruno. "Structural analysis of geodesically stiffened composite panels with variable stiffener distribution." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-12232009-020522/.

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26

Chase, Robert P. "Large 3-D deflection and force analysis of lateral torsional buckled beams /." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1644.pdf.

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27

Jillella, Nagarjuna V. "Modeling of wrinkling of thin circular sheets : a dissertation presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2006. http://proquest.umi.com/pqdweb?index=98&did=1260814051&SrchMode=1&sid=1&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1257277341&clientId=28564.

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28

LeBlanc, David N. "Beam shear connections to HSS composite columns." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63273.

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29

Wilmer, Archie. "Analytic expression of the buckling loads for stiffened plates with bulb-flat flanges." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FWilmer%5FPhD.pdf.

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30

Chattopadhyay, Arka Prabha. "Elastic buckling behavior of plate and tubular structures." Thesis, Kansas State University, 2011. http://hdl.handle.net/2097/8702.

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Master of Science
Department of Mechanical and Nuclear Engineering
Kevin B. Lease
Xiao J. Xin
The study of buckling behavior of tubular and cellular structures has been an intriguing area of research in the field of solid mechanics. Unlike the global Euler buckling of slender structures under compressive loads, tubular and cellular structures deform with their walls buckling as individual supported plates. The aspect ratio and the dimensional characteristics of the tube define the buckling behavior of any tube structure. In this thesis, a thorough study on the buckling of polygon tubular structures with different cross sections is discussed. In the first study, the theoretical buckling formulation of a square tube using the energy method is reviewed from existing solutions in literature. The elastic critical load of a square tube derived from the theoretical solution is then compared with results of finite element elastic buckling simulations. The formation of lobes along the height of the walls at different aspect ratios of the tube is investigated and compared to theory. Also, the buckling behavior of multi-wall structures is studied and the relationship between these structures and a rectangular simply supported plate is established. A brief study on the buckling behavior of rhombic tubes is also performed. The results of the simulation match closely with the theoretical predictions. The study is then extended to quadrilateral tubes with cross-sections in the shape of square, rectangle, rhombus and parallelogram. The theory of buckling of these tubes is explicitly defined using classical plate mechanics based on the previous works presented in literature. Also, the possibility of global Euler buckling in the tubular structures after a certain critical height is discussed. The prediction from the theory is validated using extensive finite element elastic buckling simulations and experimental tests on square and rhombic tube specimens. The results of the simulations and experiments are observed to be consistent with the theory. Using the formulation of plate buckling under different boundary conditions, the buckling behavior of triangular tubes is also determined. A theoretical formulation for calculating the critical load of triangular tubes is derived. The theoretical critical loads for a range of aspect ratios are compared with corresponding finite element simulation results. The comparisons reveal high degree of similarity of the theoretical predictions with the simulations.

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31

Jeevaharan, Manohara. "Local buckling behaviour and design of sandwich panels in buildings." Thesis, Queensland University of Technology, 1997. https://eprints.qut.edu.au/35998/1/35998_Jeevaharan_1997.pdf.

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Sandwich construction is increasingly used as wall and roof claddings for building structures. Typically, a cladding panel may consist of two plane or profiled metal faces with a plastic foam core. The core may be polystyrene or polyurethane. When such a panel subject to static loading due, for instance, to wind uplift or temperature gradient, one face is compressed and becomes liable to local buckling. If this face has a trapezoidal or similar profile the failure mode is similar to that for profiled steel sheeting, but the failure stress is enhanced by the presence of the core. The compressed face element first forms a series of buckling waves which increase in amplitude in the postbuckling phase. Failure take place when one buckle in the region of maximum bending moment cripples. This thesis extends the European design recommendations to validate their research for Australian sandwich panels made of high strength steel and polystyrene foam core. European design recommendations for foam filled steel members are based on polyurethane foam core and low tensile steel. In order to verify the European design recommendations for high tensile steel and polystyrene foam core, experimental tests and finite element analysis were conducted. Steel plate elements with and without foam core were used in the investigation, with varying width to thickness (b/t) ratio (105 to 513) and grade (G250 and G550) of steel. Buckling stress and buckling shape as well as ultimate stress and the associated stress versus out-of-plane deflection curves were produced. Finite element analyses and experiments illustrated the inherent benefits of composite foam filled steel members. The improvement of the buckling coefficient, K, for thin-walled steel plate elements was demonstrated. Each width to thickness (bit) ratio had a specific K value that increased with increasing width to thickness (b/t) ratio. Results obtained from this investigation showed that the European buckling and ultimate strength design equations can be satisfactorily used for the Australian sandwich panels.

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32

Bonanni, David L. "Local buckling and crippling of composite stiffener sections." Thesis, Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/80050.

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The local buckling, postbuckling, and crippling (failure) of channel, zee, and I- and J-section stiffeners made of AS4/3502 graphite-epoxy unidirectional tape are studied by experiment and analysis. Thirty-six specimens were loaded in axial compression as intermediate length columns. Examination of the experimental results indicates the existence of a number of damage initiation modes, all of which involve either delamination in some part of the specimen or local material strength failure in a comer of the specimen. The ratio of the flange width to thickness has a strong influence on the buckling stress and damage initiation mode. The inner corner radius strongly affects the buckling and crippling stresses for the I- and J-section specimens. Comparison of the numerical results from a computer code for shell analysis (STAGS) with experimental data shows good correlation prior to buckling and at the buckling load, but diminished agreement in the postbuckling region. This lack of postbuckling correlation is attributed to the neglecting of transverse shearing deformations in the structural theory, inaccuracies in the modeling of in-plane boundary conditions, and damage initiation in the experimental specimens. A plane stress failure analysis for five of the specimens shows the compressive fiber mode criterion of Hashin correlates reasonably well with the first detectable damage event. Equilibrium is used to develop interlaminar stress equations for classical laminated plate theory that require high order derivatives of the displacements. Derivatives computed from discrete displacement data using the Discrete Fourier Transform are inaccurate due to the Gibbs phenomenon.
Master of Science

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33

Hadi, Bambang Kismono. "Buckling of anisotropic sandwich panels with and without holes." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307655.

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34

Wong, Ha Hang Aaron. "Buckling and stability of slender reinforced concrete deep beams." Thesis, University of Newcastle Upon Tyne, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279763.

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35

Chen, Zi Qi. "Delamination buckling of pressure-loaded laminated cylindrical shells and panels." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/21227.

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36

Leta, James V. "An Elastica Model that Describes the Buckling of Cross-sections of Nanotubes." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1312166451.

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37

El-Adas, Kadmous Moufid. "Linear and nonlinear buckling analysis via ABAQUS." Master's thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-01262010-020017/.

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38

Stoddard, William Patrick. "Lateral-torsional buckling behavior of polymer composite I-shaped members." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/19275.

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39

Berrada, Kamal. "An experimental investigation of the plastic buckling of aluminum plates /." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63160.

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40

Saliés, Jacques Braile. "Experimental study and mathematical modeling of helical buckling of tubulars in inclined wellbores /." Access abstract and link to full text, 1994. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/9522965.

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41

Kim, Yeonsoo S. "Three-dimensional elasticity solutions for buckling of thick specially orthotropic cylidrical shells under torsion." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/20711.

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42

Wang, Junkan. "Monotonic and cyclic uplift resistance of buried pipelines in cohesionless soils." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610881.

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43

Rangarajan, Shalini. "Long-term creep of encased polymer liners." Morgantown, W. Va. : [West Virginia University Libraries], 2002. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=2582.

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Thesis (M.S.)--West Virginia University, 2002.
Title from document title page. Document formatted into pages; contains xiv, 117 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 111-113).

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Ng, Maurice Loong-Hon. "Use of Fourier series in examining the distortional buckling of beams /." St. Lucia, Qld, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17264.pdf.

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Sotolongo, Wilfredo. "On the numerical implementation of cyclic elasto-plastic material models." Thesis, Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/17594.

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Marathe, Anup Ramesh. "Buckling of dome structure with opening, under wind load." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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47

Shin, Youngwon. "Analytic shape sensitivities and approximations of local and global airframe buckling constraints /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/9984.

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48

Yuan, Qizhong. "Finite element analysis of the plastic buckling of a cantilever beam." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0001/MQ42464.pdf.

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Conrad, Katarina Terzic. "Analysis of the Buckling States of an Infinite Plate Conducting Current." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/29041.

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In this thesis we analyze the buckling behavior of an infinitely long, thin, uniform, inextensible, elastic plate that has a steady current flowing along its length. We are concerned with the derivation of the nonlinear equations of motion using nonlinear continuum mechanics, and subsequent analysis of the buckling behavior of the plate under electromagnetic self-forces. In particular, we concentrate on how the body-forces that result from the applied current determine the buckled configurations. We derive both analytical and numerical results, and in the process develop a novel boundary value problem solver for integro-differential equations in addition to a predictor-corrector algorithm to continue solutions with respect to the control parameters. We take a relatively complex problem in magneto-solid mechanics and elasticity theory and form a realistic model that sheds light on the bifurcation and buckling behavior resulting from the electromagnetic-field- induced self-forces that are derived in their full, exact form using Biot-Savart Law.
Ph. D.

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50

Poon, Chou Ping. "Advanced finite element models for the distortional buckling analysis of I-beams." St. Lucia, Qld., :, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17278.pdf.

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