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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 17 of 17 for “"stiffened panel"”.
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A study of the behavior of the GRP hat-stiffened panel bondline under high strain rate loading
Thesis (Nav. E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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Structural efficiency study of composite wing rib structures
A series of short stiffened panel designs which may be applied to a preliminary design assessment of an aircraft wing rib is presented. The computer program PASCO is used as the primary design and analysis tool to assess the structural efficiency and geometry of a tailored corrugated panel, a …
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Application and analysis of stiffened side shell panel failure for naval patrol craft
… failure. This thesis focuses on how side shell stiffened panel failure occurs from a global and local perspective, bridging the gap between a real life problem and mechanics theory in an effort to reduce uncertainty in the ship structural design and construction process. It incorporates aspects …
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EBF3GLWingOpt: A Framework for Multidisciplinary Design Optimization of Wings Using SpaRibs
… is implemented in EBF3WingOpt. A local panel optimization EBF3PanelOpt, which includes stress and buckling evaluation criteria, is performed to optimize the local panels bordered by spars and ribs for further structural weight saving. The local panel model is extracted from the global …
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A method for the geometrically nonlinear analysis of compressively loaded prismatic composite structures
… analysis of the static response of thin-walled stiffened composite structures loaded in uniaxial or biaxial compression. The method is applicable to arbitrary prismatic configurations composed of linked plate strips, such as stiffened panels and thin-walled columns. The longitudinal ends of the …
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Ultimate Strength Analysis of Stiffened Panels Using a Beam-Column Method
… for studying the ultimate strength problems of stiffened panels with two load cases: 1) under longitudinal compression, and 2) under transverse compression. Chapter 2 presents an improved step-by-step numerical integration procedure based on (Chen and Liu, 1987) to calculate the ultimate …
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Minimum-weight design of compressively loaded stiffened panels for postbuckling response
… preliminary design of minimum-weight thin-walled stiffened composite panels loaded in uniaxial compression based on a geometrically nonlinear analysis. An approximate, semi-analytical nonlinear analysis code, NLPAN, which requires buckling eigenfunction information from the buckling analysis code, …
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An evaluation of finite element models of stiffened plates subjected to impulsive loading
… very common structures, a cantilever beam and a stiffened plate, subjected to impulsive loading. For the cantilever beam case, the finite element models are one, two or three dimensional models. Various results from the finite element analyses are compared including with analytical solution and a …
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Inverse Problems in Structural Mechanics
… any given perturbation. The third application is stiffened panel optimization, including the size and placement optimization for the blade stiffeners, subject to buckling and stress constraints. The present work uses NURBS for the panel and stiffener representation. The mesh for the panel is …
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Vibration and Buckling Analysis of Unitized Structure Using Meshfree Method and Kriging Model
… using Ritz method. A 24 by 28 in. curvilinear stiffened panel was machined from 2219-T851 aluminum for experimental validation of the Ritz and meshfree methods of vibration mode shape predictions. Results were obtained for this panel mounted vertically to a steel clamping bracket using acoustic …
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Thermal Analysis and Response of Grid-Stiffened Composite Panels
… and thermal buckling loads of rectangular grid-stiffened composite panels is presented. Two edge conditions are considered for the panel, one in which all panel edges are free to deform, and another when all the edges are restrained. In the first case panel deformations due to a uniformly …
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Optimal stacking sequence design of stiffened composite panels with cutouts
… investigating several techniques for designing stiffened composite panels. The specific focus is the minimum weight design of a compression-loaded blade-stiffened composite panel with a centrally located hole subject to stability, minimum gage and strain failure constraints. An efficient …
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Global-local Finite Element Fracture Analysis of Curvilinearly Stiffened Panels and Adhesive Joints
… to study the damage tolerance of curvilinearly stiffened panels; fabricated using the modern additive manufacturing process, the so-called unitized structures, and that of adhesive joints. A damage tolerance study of the unitized structures requires cracks to be defined in the vicinity of the …
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Piezoelectric Control of Structures Prone to Instabilities
Thin-walled structures such as stiffened panels fabricated out of high strength materials are ubiquitous in aerospace structures. These are prone to buckle in a variety of modes with strong possibility of adverse interaction under axial compression and/or bending. Optimally designed stiffened …
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Passive Damping in Stiffened Structures Using Viscoelastic Polymers
… to incorporate viscoelastic material in a thick stiffened panel with plate-strip stiffeners, to enhance the damping characteristics of the structure. First, we investigated complex damped modes in beams in the presence of a viscoelastic layer sandwiched between two elastic layers. The problem was …
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Validation of the ULSAP Closed-Form Method for Ultimate Strength Analysis of Cross-Stiffened Panels
… Riks ultimate strength analyses of cross-stiffened panels. These panels cover a wide range of typical geometries. Uniaxial compression is applied to the panels, and in some cases combined with lateral pressure. For eight of the panels full-scale experimental results are available, and …
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Multidisciplinary Optimization and Damage Tolerance of Stiffened Structures
… of spars, ribs and wing skins; and the local panel optimization which optimizes the design variables of local panels bordered by spars and ribs. The stiffeners are placed on the local panels to increase the stiffness and buckling resistance. The panel thickness, size and shape of stiffeners …