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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Analysis of the coupled axial/torsional behaviour of spiral strands, wire ropes and locked coil cables

Kraincanic, Ivana January 1995 (has links)
Extensive comparative studies have been undertaken on various theoretical approaches used for analysing spiral strands, in order to identify their appropriate ranges of applicability. Based on the findings of this exercise, a theoretical model is proposed for analysing the coupled axial/torsional response of a stranded wire rope with either an independentwire rope or fibre core. A theoretical model is also proposed for the analysis ofaxial/torsionai coupling of locked coil cables, regarding which, there was previously a . paucity of reliable analytical or experimental information, despite their wide range of applications. Axial hysteresis of locked coil cables is estimated, and it is shown that it is significantly higher than the axial hysteresis associated with spiral strands. Simplified routines which are amenable to hand calculations are developed for obtaining the no-slip stiffness coefficients for the coupled axial/torsional stiffness matrix of axially preloaded spiral strands, with the effect of hydrostatic pressure on sheathed strands catered for. Moreover, the concept of orthotropic sheets for calculating the pattern of interwire/interlayer contact forces in spiral strands is used to determine the recovery length of a broken wire in any layer of a multi-layered spiral strand. Wherever possible, the final theoretical results are compared with experimental data from the available literature and very encouraging correlations have been found in all cases.
12

A fracture mechanics methodology for the assessment of fatigue cracks in tubular joints : (based on the finite element method)

Haswell, Jane V. January 1991 (has links)
Fixed jacket offshore structures. which react environmental wave loading. are generally constructed using tubular steel members. When subject to load. severe surface and through-thickness stress gradients occur due to local bending of the tubular wall. The cyclic nature of the environmental wave loading results in high stress concentration at the joints. which can lead to fatigue cracking. British Gas currently operates twelve fixed offshore structures. two of which. the Rough A-Complex structures. are now ageing and showing signs of fatigue cracking. The objective of the work described in this thesis is the development of a fracture mechanics-based methodology for the assessment of fatigue cracking in these structures. The fracture mechanics approach uses the stress intensity factor (SIl) to characterise crack-tip conditions. and provides a means of analysing the behaviour of cracks. The SIF is defined in terms of the crack site stress distribution and the change in structural compliance with crack size. Difficulties in the application of fracture mechanics lie in the derivation of accurate solutions for the SIF. The tubular joints of offshore jacket structures present particular difficulties due to their complex loading and geometry. The current work starts with a review and assessment of tubular joint fracture mechanics models. followed by a numerical study of cracked tubular joints using shell finite element (FE) models incorporating line spring crack representation. Based on the results of this study. a general fracture mechanics model for the prediction of SIF solutions for tubular joints. is derived and assessed. The general fracture mechanics model is incorporated into a crack growth model. which is best implemented using sophisticated commercial software. Crack growth and fatigue life predictions obtained are validated against full scale tubular joint fatigue data. Finally. a complete methodology for the assessment of fatigue cracks in any tubular joint is proposed, and applied to the assessment of fatigue cracking in the Rough A-Complex structures.
13

The mechanical behaviour and fatigue analysis of flexible pipes

Chen, Zhenxin January 1990 (has links)
No description available.
14

Heat affected zone toughness : the role of local brittle zones

Linton, Valerie Margaret January 1992 (has links)
No description available.
15

Oscillation of a vertical cylinder in waves

Kaye, David January 1989 (has links)
No description available.
16

Optimising cathodic protection requirements for high strength steels in the marine environment

Batt, C. January 2000 (has links)
No description available.
17

Centrifugal modelling of surface footings subject to combined loadings

Shi, Qun January 1988 (has links)
No description available.
18

Buckling behaviour of orthogonally stiffened cylinders under axial loading

Fawzy, Abdel Hadi I. January 1988 (has links)
No description available.
19

Stress and fatigue analysis of threaded tether connections

Newport, Andrew January 1989 (has links)
No description available.
20

Stochastic modelling for high fidelity DPGS quality assessment

Keenan, Christopher Ryan January 2001 (has links)
No description available.

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