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 20 of 31 for “"thin wall"”.
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Optimization of thin-wall cylindrical shells with compliant cellular-solid cores
Thin-wall, cylindrical structures are found extensively in both engineering components and in nature. Minimum weight design of such structures is essential in a variety of engineering applications, including space shuttle fuel tanks, aircraft fuselages, and offshore oil platforms. In nature, …
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Pre-Inoculation Effect of SiC in Production of Thin Wall Ductile Iron Castings
1 PDF file (66 pages)
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Investigation of mould design and process parameter optimisation of plastic injection moulding for thin wall part
… automotive, packaging and medical, demands for thin wall parts increases for the reason of light weight, lower cycle time, lower part cost and higher productivity. However, a lot of challenges faced by the moulders since the mould and processing parameters are critical to produce good quality of …
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Vibration assisted filling of thin section castings
… of the mechanism of the vibration needed to fill thin section or one with sharp edges in profile shapes and clarifying the dominant control parameters of the vibration in thin wall investment casting is key to producing sound casting (one free of misrun defects). It's also a central issue for …
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The effects of blast induced imperfections on the energy absorption characteristics of square tubes
… at opposite sides of a square tube affect the thin-wall structure and reduce its crush load when compressed in the axial direction i.e. its energy absorption characteristics.
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Failure Criteria and Cumulative Damage in Fatigue Under Multi-Axial Stress Conditions
… fatigue machine is described which can subject thin wall tubes to combinations of fluctuating internal pressure and either fluctuating longitudinal tension or compression covering the complete ++ and +- stress quadrants. The machine is also provided with independent eight stage programmers in …
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Fatigue Damage and Small Crack Growth During Biaxial Loading
… been investigated. Experiments were performed on thin-wall tubular specimens of 1045 steel in tension, torsion, and combined tension-torsion loading. Two equivalent strain amplitudes, one in the high cycle fatigue (HCF) region and one in the low cycle fatigue (LCF) region were employed in this …
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Integrated structural design, vibration control, and aeroelastic tailoring by multiobjective optimization
… of quasi-steady aerodynamic strip theory with a thin-wall box beam model showed that the integrated design for a high aspect ratio, unswept, straight, isotropic wing can be separable. Finally, an efficient modal solution of the flutter equation facilitated the aeroelastic tailoring of a low …
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Effects of plastic strain history on the properties of stainless steel boiler tube welds
… properties of austenitic stainless steel thin wall boiler tubes. These tubes are usually cold bent to shape, and sometimes swaged, prior to interconnection by welding. The bends require solution heat treatment before welding. In addition, subsequent to welding, the residual stresses should …
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Design and control of a semi-passive, heavy-duty paired mobile robot system with application to aircraft wing assembly
… of mobile robots acting on opposite sides of a thin wall. The robots interact with one another through the use of magnetic fields that penetrate this wall. The 'inner' robot is untethered and is controlled by the 'outer' robot. Despite the significant mass of the outer robot, it operates without …
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Integrated strain actuation in aircraft with highly flexible composite wings
… anisotropic piezoelectric composites (APC) within the passive composite wing skin. The goals include the ability of integrated strain actuation (ISA) to provide sufficient wing deformation for roll maneuver, gust load alleviation, flutter suppression, and redistribution of maneuver loads. A …
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Structural and biophysical studies of HIV-1 Rev protein
… threshold. It brings a filament model with a thin wall formed by Rev Nterminal\r\ntwo helixes and a flexible Rev C-terminal freely moving inside. The flexible\r\ncharacter of Rev C-terminal is also proved to be true for the Rev wild type in comparing\r\nthe HSQC of Rev wild type and RevC. The …
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The use of generalized beam theory, finite elements and experimental testing to investigate the stability of light gauge steel sections subject to axial load
… compared to hot-rolled steel are demonstrated. Thin-wall steel members have lower stiffness which may lead to increased instability and buckling issues for this kind of member. Buckling issues such as Euler buckling, buckling load factors, linear and non-linear analysis, buckling modes (global, …
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Fabrication and characterization of advanced materials using laser metal deposition from elemental powder mixture
… fabrication. Based on the studies of fabricating thin-wall Ti-6Al-4V using elemental powder mixture, comparative close particle number for Ti, Al and V powder could easily get industry qualified Ti-6Al-4V components. The particle number for each element in powder blends has been proved to be a key …
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Supportless Fabrication, Experimental, and Numerical Analysis of the Physical Properties for a Thin-Walled Hemisphere
… still needs to be developed to fabricate complex thin-wall geometries in a supportless fashion. In this research, an algorithm is presented that partitions the surfaces of the part and finds the appropriate tool orientation for each partition to avoid collisions. This algorithm is applied to …
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Magnetic force microscopy studies of mesoscopic superconducting structures
… and dissipation of the cantilever. For narrow-wall aluminum rings, the mapped fluxoid transitions form concentric contours on a scan. We show that the changes in the cantilever resonant frequency and dissipation are well-described by a stochastic resonance (SR) of cantilever-driven thermally …
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