Global ETD Search
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 18 of 18 for “"Thin-walled structures"”.
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Fracture of welded aluminum thin-walled structures
… thesis for damage prediction of welded aluminum thin-walled structures, which includes material modeling, calibration, numerical simulation and experimental verification. An extensive experimental program was conducted on large-scale welded panels used on Inter City Express (ICE) high-speed …
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Crash behavior of three dimensional thin-walled structures under combined loading
… a thorough understanding of crushing behavior of thin-walled structural members such as spot-welded sheet metal beams or extruded aluminum beams must be gained. In the present thesis, the complex crushing process of three-dimensional thin-walled structures subject to combined loading is solved …
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Structural vibration damping using lightweight, low-wave-speed media
… for prediction of the damping attained in structures that incorporate LWSM. Structural damping by incorporation of LWSM is attractive for hollow thin-walled structures. We develop analytical approximations for the loss-factor in the structural modes of cylindrical shells and Timoshenko …
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Fracture prediction in metal sheets
One of the most important failure modes of thin-walled structures is fracture. Fracture is predominantly tensile in nature and, in most part, is operated by the physical mechanisms of void nucleation, growth, and linkage. For ductile sheet, fracture is preceded by necking. Prediction of necking …
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Static and free-vibrational response of semi-circular graphite- epoxy frames with thin-walled open sections
… free vibrational response of two graphite-epoxy, thin-walled, open section frames. The frames are semi-circular with a radius of three feet, and one specimen has an I cross section and the other has a channel cross section. The flexibility influence coefficients were measured in static tests for …
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Multilevel, subdivision-based, thin shell finite elements: development and an application to red blood cell modeling
… numerical simulation of the deformation of thin walled structures. We address the need to characterize and improve the performance of the subdivision thin shell finite element for practical applications in engineering design and analysis. The contribution of this document is to provide a …
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Multimode Nonlinear Vibration Analysis of Stiffened Functionally Graded Double Curved Shells in a Thermal Environment
… showed that the nonlinear study of problems of thin-walled structures with even stiffeners is of paramount importance. It was also found that the difference between single-mode and multi-mode analyses could be very significant for nonlinear problems in a thermal environment. Hence, multimode …
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Analysis of optimum Lamb wave tuning
… interest in the nondestructive evaluation of thin-walled structures and layered media. Due to their dispersive and multi-modal nature, it is desirable to tune the waves by discriminating one mode from the others. The objectives of this thesis are (1) to develop schemes and procedures for Lamb …
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Confined wrinkling of thin elastic rods, sheets and cones
Thin-walled structures, such as plates and shells, become more vulnerable to in-plane compressive effects as their thickness is reduced, where they may buckle out-of-plane at lower than operational loads. Here, a novel approach allows the thin structures to buckle, but within a prescribed …
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Static, dynamic and aeroelastic behaviour of thin-walled composite structures with application to aircraft wings
… of the static and dynamic behaviour of thin-walled structures are carried out with the ultimate aim of improving prediction procedures for various aeroelastic phenomena. The dynamic stiffness matrix approach is used for structural idealization, while strip theory and Theodorsen's …
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Stochastic Methods for Robust Design of Launch Vehicle Structures
… the buckling load of imperfection sensitive thin-shelled structures, commonly used on launch vehicles such as the Ariane family, has been widely studied since the 1930s. Research in this area has resulted in a variety of analytical and empirical design procedures to account for the diminished …
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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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The influence of semi-rigid connections on the non-linear behaviour of pallet rack and scaffold structures
Traditional analyses of framed structures have assumed that the connections between uprights and beams are either rigid or pinned. In reality all joints exhibit flexibility and can be considered as semi-rigid. The published work in this thesis provides some of the most extensive work on the effects …
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Studies on strength and stability of toroidal shell forms for containment applications
… and quantified. The design analysis of thin-walled structures is mostly based on strength and stiffness considerations. Based on linear elastic theory, Zingoni, Enoma & Govender (2015) presented an elegant theoretical solution for the non-shallow bending of an elliptic toroid, while …
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Interactive Buckling and Post-Buckling Studies of Thin-Walled Structural Members with Generalized Beam Theory
Most thin-walled metallic structural members experience some extent of interactive buckling that corrodes the load carrying capacity. Current design methods predict the strength of thin-walled metallic structural members based on individual buckling limit-states and limited case of interactive …