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Optimization of composite structures by genetic algorithms /Le Riche, Rodolphe, January 1994 (has links)
Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references (leaves 152-162). Also available via the Internet.
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Elastic-plastic finite element modeling of long span composite joists with incomplete interaction /Nguyen, Son T., January 1992 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaves 101-103). Also available via the Internet.
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Deformation and damage analysis of composite beams equipped with polyvinylidene fluoride film sensors /Do Nascimento Oliveira, Jose Emidio. January 2008 (has links)
Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology, 2008. / Includes bibliographical references (leaves 85-86). Also available online.
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Hydrodynamic drag and flow visualization of IsoTruss lattice structures /Ayers, James T., January 2005 (has links) (PDF)
Thesis (M.S.)--Brigham Young University. Dept. of Mechanical Engineering, 2005. / Includes bibliographical references (p. 211-212).
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Infrared thermography and thermoelastic stress analysis of composite materials and structural systemsJohnson, Shane Miguel. January 2006 (has links)
Thesis (M. S.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2007. / White, Donald, Committee Member ; Haj-Ali, Rami, Committee Chair ; Will, Kenneth, Committee Member.
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Application of sensors in an experimental investigation of mode dampings /Berg, Richard Hiram. January 1993 (has links)
Thesis (M.S.)--Rochester Institute of Technology, 1993. / Typescript. Includes bibliographical references (leaves 100-102).
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Approximate analytical solutions for vibration control of smart composite beamsHuang, Da January 1999 (has links)
Thesis (MTech (Mechanical Engineering))--Peninsula Technikon, Cape Town,1999 / Smart structures technology featuring a network of sensors and actuators, real-time
control capabilities, computational capabilities and host material will have tremendous
impact upon the design, development and manufacture of the next generation of
products in diverse industries. The idea of applying smart materials to mechanical and
structural systems has been studied by researchers in various disciplines. Among the
promising materials with adaptable properties such as piezoelectric polymers and
ceramics, shape memory alloys, electrorheological fluids and optical fibers,
piezoelectric materials can be used both as sensors and actuators because of their high
direct and converse piezoelectric effects. The advantage of incorporating these special
types of material into the structure is that the sensing and actuating mechanism becomes
part of the structure by sensing and actuating strains directly. This advantage is
especially apparent for structures that are deployed in aerospace and civil engineering.
Active control systems that rely on piezoelectric materials are effective in controlling
the vibrations of structural elements such as beams, plates and shells. The beam as a
fundamental structural element is widely used in all construction. The purpose of the
present project is to derive a set of approximate governing equations of smart composite
beams. The approximate analytical solution for laminated beams with piezoelectric
laminae and its control effect will be also presented. According to the review of the
related literature, active vibration control analysis of smart beams subjected to an
impulsive loading and a periodic excitation are simulated numerically and tested
experimentally.
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Optimal design of geodesically stiffened composite cylindrical shellsGendron, Guy 28 July 2008 (has links)
An optimization system based on the finite element code CSM Testbed and the optimization program ADS is described. The optimization system can be used to obtain minimum-weight designs of composite stiffened structures. Ply thicknesses, ply orientations, and stiffener heights can be used as design variables. Buckling, displacement, and material failure constraints can be imposed on the design. The system is used to conduct a design study of geodesically stiffened shells. For comparison purposes, optimal designs of unstiffened shells and shells stiffened by rings and stringers are also obtained. Trends in the design of geodesically stiffened shells are identified. An approach to include local stress concentrations during the design optimization process is then presented. The method is based on a global/local analysis technique. It employs spline interpolation functions to determine displacements and rotations from a global model which are used as "boundary conditions" for the local model. The organization of the strategy in the context of an optimization process is described. The method is validated with an example. / Ph. D.
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Steel-concrete composite construction with precast concrete hollow core floorLam, Dennis, Elliott, K.S., Nethercot, D.A. January 1999 (has links)
No / Precast concrete hollow core floor units (hcu) are widely used in all types of multistorey steel framed buildings where they bear onto the top flanges of universal beams. The steel beam is normally designed in bending, in isolation from the concrete slab, and no account is taken of the composite beam action available with the precast units. A program of combined experimental and numerical studies was undertaken that aimed at deciding on a suitable approach for the design of composite steel beams that utilize precast concrete hollow core slabs. The results show that the precast slabs may be used compositely with the steel beams in order to increase both flexural strength and stiffness at virtually no extra cost, except for the headed shear studs. For typical geometry and serial sizes, the composite beams were found to be twice as strong and three times as stiff as the equivalent isolated steel beam. The failure mode was ductile, and may have been controlled by the correct use of small quantities of tie steel and insitu infill concrete placed between the precast units.
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Finite element analysis of geodesically stiffened cylindrical composite shells using a layerwise theoryGerhard, Craig Steven 22 May 2007 (has links)
Layerwise finite element analyses of geodesically stiffened cylindrical shells are presented In this work. The layerwise laminate theory of Reddy (LWTR) is developed and adapted to circular cylindrical shells. The Ritz variational method is used to develop an analytical approach for studying the buckling of simply supported geodesically stiffened shells with discrete stiffeners. This method utilizes a Lagrange multiplier technique to attach the stiffeners to the shell. The development of the layerwise shells couples a one-dimensional finite element through the thickness with a Navier solution that satisfies the boundary conditions. The buckling results from the Ritz discrete analytical method are compared with smeared buckling results and with NASA Testbed finite element results. The development of layerwise shell and beam finite elements is presented and these elements are used to perform the displacement field, stress, and first-ply failure analyses. The layerwise shell elements are used to model the shell skin and the layerwise beam elements are used to model the stiffeners. This arrangement allows the beam stiffeners to be assembled directly into the global stiffness matrix. A series of analytical studies are made to compare the response of geodesically stiffened shells as a function of loading, shell geometry, shell radii, shell laminate thickness, stiffener height, and geometric nonlinearity. Comparisons of the structural response of geodesically stiffened shells, axial and ring stiffened shells, and unstiffened shells are provided. In addition, interlaminar stress results near the stiffener intersection are presented. First-ply failure analyses for geodesically stiffened shells utilizing the Tsai-Wu failure criterion are presented for a few selected cases. / Ph. D.
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