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Improvement of the axial buckling capability of elliptical cylindrical shellsPaschero, Maurizio 24 April 2008 (has links)
A rather thorough and novel buckling analysis of an axially-loaded orthotropic circular cylindrical shell is formulated. The analysis assumes prebuckling rotations are negligible and uses a unique re-defining of the orthotropic material properties in terms of a so-called geometric mean isotropic (GMI) material. Closed-form expressions for the buckling stress in terms of cylinder geometry and orthotropic material properties are presented, the particular closed form depending on the specific character of the orthotropic material relative to the GMI material. With the formulation, the specific character of the buckling deformations - e.g., axisymmetric or nonaxisymmetric, the number of axial and circumferential waves - can be established. By using the maximum radius of curvature of an elliptical cross section in this formulation, the analysis is used to demonstrate the detrimental effects of an elliptical cross section on axial buckling capacity when compared to a circular cross section with the same circumference. Using the circumferentially-varying radius of curvature of an elliptical cross section, the analysis is then further used as the basis for developing two methods for improving the axial buckling capacity of elliptical cylinders. The first approach involves varying the wall thickness of an isotropic elliptical cylinder with circumferential position. Uniformly stable elliptical cross sections which preserve the same critical stress, critical load, or volume of an axially loaded circular cylinder of the same circumference are designed with the formulation. The second approach involves maintaining a uniform wall thickness but varying the orthotropic material properties with circumferential position. This approach is applied to a cylindrical lattice structure where it is assumed that the ribs are dense enough to be able to describe the lattice structure by means of an equivalent homogenized material. The orthotropic properties of the homogenized material are varied by varying the lattice rib angle with circumferential position. Considerable recovery of the axial buckling capacity of the variable-rib-angle design elliptical cylinder compared to the same cylinder constructed in isogrid fashion is demonstrated. In fact, recovery relative to an isogrid circular cylinder of the same circumference is demonstrated. For both approaches confirming finite element models are used to verify the findings. The two different approaches are compared, and finally the two approaches are recognized as special cases of a more general design philosophy. / Ph. D.
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The Effect of Randomly Varying Added Mass on the Dynamics of a Flexible Cylinder in Two-Phase Axially Flowing FluidKlein, Christophe 10 1900 (has links)
No description available.
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The effect of randomly varying added mass on the dynamics of a flexible cylinder in two-phase axially flowing fluid /Klein, Christophe. January 1981 (has links)
No description available.
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The effect of randomly varying added mass on the dynamics of a flexible cylinder in two-phase axially flowing fluid /Klein, Christophe. January 1981 (has links)
No description available.
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Interference effects on the flow-induced vibration of a flexible circular cylinder due to a larger-sized cylinder in the vicinity杜平, To, Ping. January 1998 (has links)
published_or_final_version / Civil Engineering / Doctoral / Doctor of Philosophy
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Investigation of flows over an asymmetric circular cylinder黃俊雄, Wong, Chun-hung. January 1997 (has links)
published_or_final_version / Mechanical Engineering / Doctoral / Doctor of Philosophy
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Vortex induced vibrations of slender cylinders in sheared flowHumphries, J. A. January 1987 (has links)
No description available.
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The hydromagnetic stability of Taylor Couette flowWillis, Ashley Phillip January 2002 (has links)
No description available.
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Tough 7XXX aluminium alloys for use in compressed natural gas containmentRobey, Robert Frank January 1997 (has links)
No description available.
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Analysis of Finite Length, Orthotropic Composite Cylinders Including Through-Thickness Shear EffectsMansfield, Byron Allen 22 February 2007 (has links)
Student Number : 0001361N -
MSc(Eng) dissertation -
School of Mechanical, Industrial and Aeronautical Engineering -
Faculty of Engineering and the Built Environment / Thick composite cylinders are important structural elements which cannot
be analysed by traditional techniques due to through-thickness effects. This
work presents analyses for thick composite tubes of finite length including
through-thickness shear. A numerical thermal analysis is implemented for the
determination of the transient through-thickness behaviour of tubes. A me-
chanical analysis, based on the Rayleigh-Ritz technique, is presented which
analyses finite length, composite tubes under a variety of loadings. The anal-
yses are shown to be accurate and efficient and are validated against existing
results. Results are presented for two ring-stiffened tubes under pressure and
thermal loading and also for the transient thermal behaviour of these tubes.
It was found that both the through-thickness and transient effects are of im-
portance as the stress variation through the thickness and with time was
significant for both tubes.
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