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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 49 for “"Shell Elements"”.
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Development of Membrane, Plate and Flat Shell Elements in Java
… triangular and quadrilateral membrane, plate and shell elements in Java using the object oriented programming technique is presented. The membrane elements developed are the constant strain triangle (CST) element and the four node isoparametric quadrilateral membrane element. The plate bending …
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Towards optimal mixed finite elements for general shell structures
Optimal finite elements are available for many engineering applications, such as incompressible media, beam and plate bending problems. However, no existing general shell elements have been shown to satisfy the mathematical conditions of optimality in the analysis of shell structures. The objective …
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Um sistema computacional para a análise de cascas de revolução com irregularidades localizadas
… which is presently intended for the analysis of shells, and particularly of shells of revolution with local irregularities. In the analysis of these shells, the "classic" approach would be either to analyse the entire structure with 3-D shell elements, or else, for preliminar studies, to ignore …
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Modeling of sheet metal fracture for shell finite elements with component level validation
… a pressing issue. The industry has been using shell finite elements in design practice due to many practical advantages over solid elements. A constitutive assumption of the plane stress condition in shell elements, violated after the onset of localized necking, is responsible for an inaccurate …
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Performance Of Interface Elements In The Finite Element Method
… is to assess the performance of interface elements in the finite element method. Interface elements are implemented in the finite element codes such as MSC.NASTRAN, which is used in this study. Interface elements in MSC.NASTRAN provide a tool to transition between a shell-meshed region to …
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Behavior of bolted connections in railroad diamond crossings
… and replacement costs of special track work elements are an expensive problem for the railroad industry. In the railroad industry, special track work refers to special railroad elements, including turnouts, switches, and diamond crossings, that are used where rails join or cross. The repeated …
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On triangular finite elements for general shell structures
In general, triangular elements are most efficient to discretize arbitrary shell geometries. However, in shell finite element analysis, usually quadrilateral elements are used due to their better performance. Indeed, there does not exist yet a "uniformly optimal" triangular shell element. The work …
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Delamination initiation in postbuckled dropped-ply laminates
… are studied using three-dimensional solid elements, while the uniform sections of the plate are modeled with quadrilateral shell elements. A geometrically nonlinear transition element was developed to couple the shell elements to the solid elements. The analysis was performed using the …
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An axisymmetric cubic finite element for laminated anisotropic cylindrical shells
… thick laminated composite circular cylindrical shells is developed. This model accounts for transverse shear deformation and rotary inertia effects. Unlike conventional shell elements, this new element allows separate rotational degrees of freedom for each layer (hence giving more flexibility …
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School bus crashworthiness
… by discretizing the geometry into a number of elements.;Every day thousands of children travel to school and school related events by bus. Not necessarily all the journeys are short and safely driven. The potential for serious injuries is possible in the event of a crash. The severity of injury …
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Aplicação do M.E.F. na análise do colapso de tubulações submarinas para águas profundas
… is discretized using nonlinear isoparametric shell elements, which accounts for geometric and material nonlinearities. Plastification across the thickness is represented by using a layered model. The collapse analysis is performed through an incremental-iterative nonlinear analysis, based on …
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Análise da propagação de trincas em estruturas metálicas predominantemente axissimétricas
… Steel Structures by the FEM. Axisymmetric shell finite elements are used in the axisymmetric regions of the structure and 3-D shell elements in the regions where geometric deviations are found. The interface between these two regions is made through a "Transitional Element". The …
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Influence of Bridge Parameters on Finite Element Modeling of Slab on Girder Bridges
… of different modeling techniques and of elements used to model the primary bridge components was assessed using simple models for which analytical solutions are readily available. From these studies, it was concluded that shell elements are adequate to model the bridge deck, and beam and …
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An evaluation of finite element models of stiffened plates subjected to impulsive loading
… conditions. The plate modeled with 4-node shell elements and the stiffeners modeled with 2- node iso-beam elements are shown to yield excellent results while requiring reasonable computational resources. In addition to the evaluation of the finite element models, the thesis presents closed- …
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Monotonic and Cyclic Simulation of Screw-Fastened Connections for Cold-Formed Steel Framing
… and CFS structural components modeled with thin-shell elements. An ABAQUS user element (UEL) is written and verified for a nonlinear hysteretic model that can simulate pinching and strength and stiffness degradation consistent with CFS screw-fastened connections. The user element is verified at …
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Modeling and stability investigation of a Glulam dome
… element methods. I-DEAS is utilized to generate shell elements and to compute nodal forces for the dome model. Wind load requirements are studied, and the effect of wind loads is investigated. At first, linear and nonlinear analyses of a space frame are carried out for four load combinations of …
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Propagation of delamination in layered anisotropic cylinders
… long cylinder by treating it as a thin shell, with an axisymmetric crack in the adhesive layer between two laminae, and an axisymmetric loading acting as the driving force. The axial and shear strains of the reference plane are considered negligible compared to its circumferential …
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Contributions to the anisotropic elasto-plastic analysis of shells
Shells are probably the most widely used structural component in engineering and also in nature due to their high efficiency and excellent performance when properly designed. On the other hand, they can be very sensitive to changes in geometries, thicknesses, applied loads and boundary conditions. …
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Seismic assessment strategies for masonry structures
… to incorporate non-proportional loading and shell elements. These extensions enable prediction of damage and collapse mechanisms in general, but are specifically used to predict the response of a full-scale masonry structure to quasi-static cyclic loading. Subsequently, assessment methods …
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ΔΙΕΡΕΥΝΗΣΗ ΤΗΣ ΑΞΙΟΠΙΣΤΙΑΣ ΙΣΟΔΥΝΑΜΩΝ ΠΛΑΙΣΙΑΚΩΝ ΠΡΟΣΟΜΟΙΩΜΑΤΩΝ ΓΙΑ ΠΥΡΗΝΕΣ ΠΟΛΥΟΡΟΦΩΝ ΚΤΙΡΙΩΝ ΥΠΟ ΟΡΙΖΟΝΤΙΑ ΦΟΡΤΙΣΗ
… MORE ACCURATE ANALYTICAL METHODS(SURFACE FINITE ELEMENTS AND CONTINUOUS MODEL OF VLASSOV) HAS BEEN MADE. THUS,IN THE FIRST STAGE THOROUGH INVESTIGATION IS MADE IN ORDER TO CHECK THE RELIABILITY OF THE VARIOUS FRAME MODELS FOR ISOLATED CORES OF DIFFERENT TYPES (OPEN, SEMI-OPEN CORES WITH LINTEL …
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