Browsing Mechanical Engineering (Scholarly Articles) by Title
Now showing items 67-86 of 134
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High temperature, low cycle fatigue characterisation of P91 weld and heat affected zone material
(American Society of Mechanical Engineers, 2014-01-08)The high temperature low cycle fatigue behavior of P91 weld metal (WM) and weld joints (cross-weld) is presented. Strain-controlled tests have been carried out at 400 °C and 500 °C. The cyclic behavior of the weld material ... -
High-resolution measurement of the unsteady velocity field to evaluate blood damage induced by a mechanical heart valve
(Springer, 2011-09)We investigate the potential of prosthetic heart valves to generate abnormal flow and stress patterns, which can contribute to platelet activation and lysis according to blood damage accumulation mechanisms. High-resolution ... -
High-resolution measurements of leakage flow inside the hinge of a large-scale bileaflet mechanical heart valve hinge model
(Springer, 2019-06-24)Purpose It is believed that non-physiological leakage flow through hinge gaps during diastole contributes to thrombus formation in Bileaflet Mechanical Heart Valves (BMHVs). Because of the small scale and difficulty of ... -
Idea management for organisational Innovation
(World Scientific, 2003-12)Modern organisations are under ever increasing competitive pressure to maintain market share, enhance product range, improve efficiency and reduce cost. The process by which organisations attain these improvements is ... -
An improved unified viscoplastic model for strain-rate sensitivity in high temperature fatigue
(Elsevier ScienceDirect, 2013-11-21)An improved unified cyclic viscoplastic material model for high temperature fatigue of P91 steel is presented. The primary enhancement over existing models is in relation to strain-rate independence of parameters, for ... -
In-situ SEM study of fatigue micro-crack initiation and propagation behavior in pre-corroded AA7075-T7651
(Elsevier, 2020-04-18)Fatigue micro-cracking behavior in pre-corroded AA7075-T7651 is analyzed by in-situ scanning electron microscopy (SEM) observation and SEM-based fractography. The experimental results show that (i) fatigue microcracks ... -
Influence of fast pyrolysis conditions on yield and structural transformation of biomass chars
(Elsevier, 2015-09-19)Fast pyrolysis of biomass (wood, straw, rice husk) and its major components (cellulose, hemicellulose, lignin) was conducted in a wire mesh reactor. The aim of this study was to understand the influence of temperature ... -
Influence of material inhomogeneity on the mechanical response of a tempered martensite steel
(SAGE Publications, 2017-01-13)Failure in steel weldments operating at high temperatures often occurs in the heat-affected zone adjacent to the weld. Such failures can be a result of material inhomogeneity within the heat-affected zone and in the case ... -
Influence of microstructural defects and hydrostatic pressure on water absorption in composite materials for tidal energy
(SAGE Publications, 2018-01-06)The lifespan and economic viability of tidal energy devices are constrained, in part, by the complex degradation of the tidal turbine blade materials due to prolonged immersion in a hostile sub-sea environment. Seawater ... -
Knowledge sharing in a collaborative networked environment
(2007)Knowledge is a key resource that must be managed within organisations and across collaborative enterprise networks. In particular, the two major challenges that face such organisations are; ensuring that they have the ... -
Manufacturing SMEs doing it for themselves: developing, testing and piloting an online sustainability and eco-innovation toolkit for SMEs
(Taylor & Francis, 2019-11-07)Public discourse frequently cites the damaging activities of large organisations on global environmental issues, but smaller organisations are rarely, if ever, featured. Small and Medium Enterprises (SMEs) make up 99% of ... -
Micro-mechanical modelling of fretting fatigue crack initiation and wear in Ti-6Al-4V
(Elsevier ScienceDirect, 2013-05-02)A micro-mechanical modelling methodology is presented for predicting fretting fatigue crack nucleation in Ti–6Al–4V. The methodology is based on a combination of (i) a unit cell crystal plasticity model of Ti–6Al–4V, (ii) ... -
Micromechanical finite element modelling of thermo-mechanical fatigue for P91 steels,
(Elsevier, 2016-01-21)In this paper, the cyclic plasticity and fatigue crack initiation behaviour of a tempered martensitic ferritic steel under thermo-mechanical fatigue conditions is examined by means of micromechanical finite element modelling. ... -
Micromechanical modelling of fatigue crack nucleation in stents
(Bioengineering In Ireland Conference 2012, 2012)A finite element based micro-mechanical methodology for cyclic plasticity and fatigue crack initiation in cardiovascular stents is presented. The methodology is based on the combined use of a (global) three-dimensional ... -
Microstructure modeling of high-temperature microcrack initiation and evolution in a welded 9Cr martensitic steel
(SAGE Publications, 2019-02-28)Welded joints in tempered 9Cr-1Mo operating at elevated temperatures are well known to be prone to premature failure due to cracking in the heat-affected zone. This paper describes a crystal plasticity model to predict the ... -
Microstructure-sensitive prediction and experimental validation of fretting fatigue
(Elsevier ScienceDirect, 2013-06-03)This paper is concerned with the development of a micro-mechanical methodology for prediction of fretting fatigue crack nucleation life and short crack propagation. The methodology employs critical accumulated plastic slip ... -
A model for surface tension in the meshless finite volume particle method without spurious velocity
(Elsevier, 2018-11-22)A surface tension model has been developed in the finite volume particle method (FVPM). FVPM is a conservative, consistent, meshless particle method that incorporates properties of both smoothed particle hydrodynamics and ... -
Modeling the influence of potassium content and heating rate on biomass pyrolysis
(Elsevier, 2017-03-14)This study presents a combined kinetic and particle model that describes the effect of potassium and heating rate during the fast pyrolysis of woody and herbaceous biomass. The model calculates the mass loss rate, over a ... -
Models of flow-induced loading on blood cells in laminar and turbulent flow, with application to cardiovascular device flow
(Springer, 2007-08)Viscous shear stress and Reynolds stress are often used to predict hemolysis and thrombosis due to flow-induced stress on blood elements in cardiovascular devices. These macroscopic stresses are distinct from the true ... -
A multi-axial cyclic viscoplasticity model for high temperature fatigue of P91 steel
(Maney Online, 2014)This paper presents a novel multiaxial, cyclic viscoplasticity material model for high temperature low cycle fatigue of P91 power plant steel. The model incorporates mechanisms-based variable strain-rate sensitivity and ...