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Browsing Mechanical, Aeronautical & Biomedical Engineering by Title

Browsing Mechanical, Aeronautical & Biomedical Engineering by Title

Now showing items 71-90 of 148

Measurement of strain induced responses at femoral artery bypass graft junctions

Campbell, Tríona (University of Limerick, 2015)

Femoral artery bypass grafts have a predilection for failure at the distal anastomosis due to restenosis, within a short period of time, the cause of which has been attributed to altered haemodynamics. This study proposes ...
Mechanical characterisation of composite materials with 3D woven reinforcement architectures

Obande, Winifred O. (University of Limerick, 2016)

The use of traditional two-dimensional (2D) fibre preforms can be associated with poor out-of-plane and interlaminar mechanical performance, particularly in response to impact loads. Such preforms comprise multiple plies ...
Micromechanical modelling of damage and failure in fibre reinforced composites under loading in the transverse plane

Vaughan, Ted Joseph (University of Limerick, 2011)

Fibre reinforced composites exhibit a gradual damage accumulation to failure, with a multitude of hierarchical dissipative mechanisms responsible for the deterioration of mechanical properties. In order to predict failure ...
Microscale deformation of a tempered martensite ferritic steel:Modelling and experimental study of grain and sub-grain interactions

Golden, Brian J; Li, Dong-Feng; Guo, Yina; Tiernan, Peter; Leen, Sean B; O'Dowd, Noel P. (Elsevier, 2015)

In this paper, a nite-element modelling framework is presented with explicit representation of polycrystalline microstructure for a tempered martensite ferritic steel. A miniature notched specimen was manufactured from ...
Military airworthiness management frameworks: a critical review

Kourousis, Kyriakos I; Purton, Leon (Elsevier, 2014)

Despite all current measures taken to assure their safety, aircraft are still crashing. Since 1944 there has been a global organization, International Civil Aviation Organization (ICAO), focused on providing rules for ...
Mitigation of biological adhesion to aircraft leading edge surfaces

Kok, Mariana (University of Limerick, 2014)

Contamination caused by insects on aircraft leading edge surfaces can result in premature transition of the boundary layer, leading to an increase in skin friction drag and fuel consumption. Consequently, the use of novel ...
Modelling the relationships between physical risk factors and operator performance in short cycle

Finneran, Aoife (University of Limerick, Department of Manufacturing & Operations Engineering, 2010)

Physical risk factors and their combinations are linked to the causation of Musculo Skeletal Disorders (MSDs) which has implications for on-site operator productivity. Current risk assessment methods have no element to ...
Multiaxial ratcheting with advanced kinematic and directional distortional hardening rules

Feigenbaum, Heidi P; Dugdale, Joel; Dafalias, Yannis F; Kourousis, Kyriakos I; Plesek, Jiri (Elsevier, 2012)

Ratcheting is defined as the accumulation of plastic strains during cyclic plastic loading. Modeling this behavior is extremely difficult because any small error in plastic strain during a single cycle will add to become ...
Multiplicative AF kinematic hardening in plasticity

Dafalias, Yannis F; Kourousis, Kyriakos I; Saridis, George J (Elsevier, 2008)

The basic innovation proposed in this work is to consider one of the two coefficients of the Armstrong and Frederick (AF) evolution equation for the back stress, function of another dimensionless second order internal ...
Multiscale characterisation of damage in laminated composite materials under bending loads

Mortell, Daniel J (University of Limerick, 2016)

In-situ micro-mechanical testing of small composite laminates has been carried out under SEM where video recordings allowed examination of the evolution of damage processes at the microscale. Samples are tested under three- ...
New approaches to abdominal aortic aneurysm rupture risk assessment - engineering insights with clinical gain

McGloughlin, Timothy M.; Doyle, Barry J. (Lippincott Williams & Wilkins, 2010)

Abdominal aortic aneurysm (AAA) rupture remains a significant cause of death in the developed world. Current treatment approaches rely heavily on the size of the aneurysm to decide on the most appropriate time for clinical ...
Noninvasive methods of characterising local regional variations in aortic tissue to advance aneurysm rupture risk prediction

Tierney, Áine P. (University of Limerick, 2012)

Abdominal Aortic Aneurysms (AAAs) is a permanent and irreversible dilation of the infrarenal section of the aorta. AAA’s are generally asymptomatic, until rupture of the AAA wall occurs. Rupture can lead to large abdominal ...
A novel operational decision making method for SMES.

Lynch, Andrew (University of Limerick, 2011)

Small to Medium Enterprise (SME) performance is a function of the composite of the decision-making processes within the enterprise. Owner managers are conscious of the gap in their decision-making efficacy and acknowledge ...
Numerical and analytical modelling of strength and toughness of carbon nanotubes and carbon nanotube reinforced nanocomposites

Byrne, Martin Emmett (University of Limerick, 2014)

The exceptional mechanical properties of carbon nanotubes (CNTs) make them highly attractive as potential reinforcing constituents in next generation composites. CNTs can be used as toughening agents in ceramic, metal or ...
A numerical and experimental investigation of the mean and turbulent characteristics of a wing-tip vortex in the near-field

O'Regan, Micheál Seán (University of Limerick, 2014)

Turbulent wing-tip vortices are an extremely important fluid dynamics phenomena for their negative impact in several applications. Despite the many numerical and experimental studies conducted on this particular flow, ...
A numerical investigation of the irradiation of CNT bundles for enhancement of mechanical properties by improved inter-tube coupling

O'Brien, Nathan P. (2014)

The ultra-high stiffness and strength of carbon nanotubes (CNTs), of the order of 1 TPa and 100 GPa respectively, has stimulated intense interest in CNT-based composites, including the development of super strong fibres ...
Numerical modelling of cooling crystallisation: process kinetics to optimisation

Mitchell, Niall A (University of Limerick, 2012)

The research detailed in this dissertation expands the field of knowledge in the area of numerical modelling of cooling crystallisation processes in stirred vessels. The paracetamol and ethanol solution system was chosen ...
Numerical modelling of crystallisation processes: kinetics to optimization

Ó'Ciardha, Clifford Thomás (University of Limerick, 2013)

Crystallisation and precipitation processes are used in the chemical and pharmaceutical industry to produce crystals with desired product properties, such as flow ability, filterability, drying time and bioavailability. ...
Numerical simulation of the L-glutamic acid polymorphic system

Frawley, Patrick J; Scully, James (University of Limerick, Department of Mechanical & Aeronautical Engineering, 2010)

The research detailed in this dissertation expands the field of knowledge in the area of numerical modelling of polymorphic systems and the suspension of polymorphs in stirred tanks. The L-glutamic acid polymorphic system ...
On slip flow and interfacial phenomena within superhydrophobic microchannels

O'Keeffe, Niall (University of Limerick, 2012)

The unique wetting properties of superhydrophobic (SH) surfaces have attracted a considerable interest in recent years. Their ability to repel liquids produces some remarkable characteristics such as spherical droplet ...

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