Browsing Mechanical & Manufacturing Eng (Theses and Dissertations) by Date of Publication
Now showing items 21-40 of 235
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A stochastic model of damage accumulation in acrylic bone cement : application to failure modelling of cemented hip replacement
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2003)Acrylic bone cement, used to fixate several forms of orthopaedic joint replacement prosthesis, has a variable fatigue resistance arising mainly from porosity. It is argued that deterministic modelling assumptions of ... -
Metal spinning, an incremental forming process
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2003)Recent changes in product development processes have increased the demand for sheet metal parts manufactured in low volumes with the minimum investment in tooling. Spinning and a related process called 'incremental stretch ... -
Numerical vibro/acoustic analysis at higher frequencies
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2003)Accurate modelling of steady-state acoustic and elastic wave phenom ena at higher frequencies, represents a major challenge for current numerical tools. Due to the large amount of computational effort and memory resources ... -
The cellular transducer in damage-stimulated bone remodelling
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2004)People with osteoporosis, osteopenia or weight baring joint replacement, due to an altered loading configuration, are more susceptible to microdamage accumulation than normal human beings as are athletes who undertake ... -
Adaptation of growing bone to altered mechanical load : morphological change, structural strength and gene expression
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2004)Osteoporosis, a condition characterised by a loss of bone mass, is of increasing clinical interest in an aging population. Bone formation and growth are controlled by genetic, hormonal and biomechanical factors. This ... -
Fracture and fatigue in High Impact Polystyrene : the influence of secondary phase morphology (Rubber Particle Size and Effective Rubber Phase Volume) on fracture and fatigue behaviour in HIPS
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2004)The subject of the following thesis is the influence of the secondary phase morphology on fracture and fatigue behaviour in High Impact Polystyrene (HIPS). The motivation of the work was the premature failure of parts ... -
An investigation into the influence of cardiovascular stent design on the development of restenosis using the finite element method
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2004)Finite element models, which can determine the degree of vascular injury caused to a vessel by a stent and hence ascertain the propensity of that stent design to cause in¬stent restenosis, would be a valuable tool for both ... -
Mechanobiology of tissue differentiation during osteochondral defect repair
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2004)Differentiation can be thought of as a process by which cells and tissues undergo a change in phenotype toward a more specialized form or function. It is the contention of this thesis that tissue differentiation is in some ... -
Failure of cemented hip implants under complex loading : experimental and numerical analysis
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2004)A new generation of experimental pre-clinical testing methods for cemented hip replacement femoral components have been proposed, and preliminarily validated by comparing a 'good' prosthesis design with a 'bad' prosthesis ... -
The effect of stress concentrations on fatigue and fracture of 316L stainless steel micro-scale components
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2004)The aim of this work was to investigate the fatigue and fracture behaviour of microscopic specimens based on a biomedical component (the cardiovascular stent) and to modify existing theories to take account of the observed ... -
Biomechanical origins of osteoporosis
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2004)The contention of this thesis is that a pathological change in bone tissue material properties during osteoporosis ahers the mechanical stimuli to bone remodelling cells and drives them to adapt the trabecular architecture ... -
Three-dimensional vortex particle-in-cell technique
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2004) -
An experimental and 3D finite element analysis of a form rolling process
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2005)This thesis investigates a cold forming process called Form Rolling. Form Rolling is an innovative method of producing near-net shape parts, which is being implemented in particular by fastener manufacturers. In this study, ... -
Investigating the load, friction and sealability characteristics of graphite valve packings
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2005)It is widely accepted that valve stem leakage accounts for the majority of fugitive emissions from petrochemical and chemical sites often accounting for over 50% of fugitive emissions from these sites. The most common valve ... -
Finite element and experimental analysis of dented aircraft panels
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2005)Aircraft fuselage panels are susceptible to low velocity impact damage in the form of "dents" from a variety of in-service sources, such as cargo and service trucks, dropped tools during servicing, walking on "no-step ... -
Noise source identification for ducted fans
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2006)Understanding combustion noise source mechanisms, designing efficient acoustic liners and optimising active control algorithms for noise reduction requires the identification of the frequency and modal content of the ... -
Analysis of noise source mechanisms for a subsonic jet
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2006)Despite advances in engine design, from high bypass to co-axial or lobe shaped nozzles, the problem of jet noise reduction continues to require ongoing research in order to comply with the criteria inherent in environmental ... -
Multivariate statistical methods for fault detection and classification
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2006) -
Failure mechanisms in bone - a mechanical and histological study
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2006)Repeated loading causes the development of microdamage in bone and may lead to failure by fatigue. Microdam age in the form of microcracks occurs naturally in bone due to the loads experienced during day-to-day activities, ... -
Computational and experimental investigation of bone cell response to mechanical stimuli
(Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2006)The importance of mechanical loading in maintaining bone quality is well illustrated by the drastic effects of its absence in, for example, microgravity, cast immobilisation or paraplegia. The mechanisms underlying adaptation ...
