Browsing Mechanical Engineering by Author "http://dx.doi.org/10.13039/501100001602"
Now showing items 1-20 of 43
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A CFD investigation of a variable-pitch vertical axis hydrokinetic turbine with incorporated flow acceleration
Mannion, Brian; McCormack, Vincent; Leen, Sean B.; Nash, Stephen (Springer, 2019-02-18)This paper presents the numerical modelling of a novel vertical axis tidal turbine that incorporates localised flow acceleration and variable-pitch blades. The focus is to develop a computational fluid dynamics model of a ... -
Characterization of woodstove briquettes from torrefied biomass and coal
Trubetskaya, Anna; Leahy, James J.; Yazhenskikh, Elena; Müller, Michael; Layden, Peter; Johnson, Robert; Ståhl, Kenny; Monaghan, Rory F.D. (Elsevier, 2019-01-18)Using waste biomass materials offers the potential to reduce the greenhouse gas emissions from fossil fuels. Torrefaction is very useful for improving the fuel properties of biomass in order to better match those of coal. ... -
Computational modelling of dynamic recrystallisation of Ni-based superalloy during linear friction welding
Okeke, Saviour I.; Harrison, Noel M.; Tong, Mingming (Springer, 2022-01-12)Linear friction welding (LFW) is an advanced joining technology used for manufacturing and repairing complex assemblies like blade integrated disks (blisks) of aeroengines. This paper presents an integrated multiphysics ... -
Cyclic plasticity of welded P91 material for simple and complex power plant connections
Li, Ming; Barrett, Richard A.; Scully, Stephen; Harrison, Noel M.; Leen, Sean B.; O’Donoghue, Padraic E. (Elsevier, 2016-02-10)This paper focuses on with the cyclic plasticity modelling of welded, ex-service P91 material. A multi material model is developed for high temperature cyclic plasticity, including the effects of the three different material ... -
Deformation mechanisms of selective laser melted 316L austenitic stainless steel in high temperature low cycle fatigue
Chen, Yefeng; Wang, Xiaowei; Shen, Jiawei; Peng, Yawei; Jiang, Yong; Yang, Xinyu; Leen, Sean B.; Gong, Jianming (Elsevier, 2022-04-22)To investigate the low cycle fatigue (LCF) properties of SLM (Selective laser melting) 316L at 550 °C high temperature, a series of LCF tests at different strain amplitudes is conducted on SLM 316L and traditional 316L. ... -
Dissolution of delta phase in Ni-based superalloy during linear friction welding: integrated multiphysics computational process modelling
Okeke, Saviour I.; Harrison, Noel M.; Tong, Mingming (Springer, 2021-06-15)Linear friction welding (LFW) is an increasingly popular solid-state joining method for challenging applications such as integrated blade disk of aero-engines. However, the influence of friction-generated heat on the ... -
The effect of ferrite phases on the micromechanical response and crack initiation in the intercritical heat-affected zone of a welded 9Cr martensitic steel
Li, M.; Sun, F.; Li, D.F.; O'Donoghue, P.E.; Leen, Sean B.; O'Dowd, N.P. (Wiley, 2018-02-08)This paper presents a crystal plasticity model to predict the tensile response and crack initiation in a mixed ferrite-martensite material with a low volume fraction of pro-eutectoid ferrite, representative of a welding-induced ... -
Effect of pre-corrosion on damage evolution and crack propagation in aluminum alloy 7050-T7651
Song, Haipeng; Bai, Zhengguan; Zhang, Hao; Niu, Yifan; Leen, Sean B. (Wiley, 2018-05-16)This paper investigates the effects of pre-corrosion on the tensile behavior of aluminum alloy 7050-T7651. A combined experimental approach involving digital image correlation, scanning electron microscopy, and tensile ... -
Efficiency and accuracy of GPU-parallelized Fourier spectral methods for solving phase-field models
Boccardo, Adrian; Tong, Mingming; Leen, Sean B.; Tourret, Damien; Segurado, Javier (Elsevier, 2023-06-15)Phase-field models are widely employed to simulate microstructure evolution during processes such as solidification or heat treatment. The resulting partial differential equations, often strongly coupled together, may be ... -
An efficient computational framework for hydrofoil characterisation and tidal turbine design
Heavey, Shane C.; Leen, Sean B.; McGarry, Patrick J. (Elsevier, 2018-11-13)Blade element momentum (BEM) modelling offers a computationally inexpensive means of analysing turbine performance. Lift and drag coefficient data-sets specific to the operating conditions of the turbine must be input into ... -
Experimental characterisation and computational modelling for cyclic elastic-plastic constitutive behaviour and fatigue damage of X100Q for steel catenary risers
Devaney, Ronan J.; O'Donoghue, Padraic E.; Leen, Sean B. (Elsevier, 2018-06-21)New higher strength steels are required for deep and ultra-deepwater steel catenary risers (SCRs). In this work, the cyclic elastic-plastic-damage behaviour of X100Q, a candidate next-generation SCR material is experimentally ... -
Experimental characterization and strengthening mechanism of process-structure-property of selective laser melted 316 L
Chen, Yefeng; Wang, Xiaowei; Li, Dong; Zhou, Dewen; Jiang, Yong; Yang, Xinyu; Liu, Chenglu; Leen, Sean B.; Gong, Jianming (Elsevier, 2023-03-02)Heat treatment is the most common method to relieve residual stress and to adjust tensile properties in additively manufactured material. However, the well-known strengthening factors (e.g., dislocation density, cellular ... -
Experimental investigation, numerical modelling and multi-objective optimisation of composite wind turbine blades
Fagan, Edward M.; Leen, Sean B.; de la Torre, Oscar; Jamie, Goggins (Taylor & Francis, 2017-05-24)Static load and modal testing of two blades from a 15 kW wind turbine is presented. The two blades are made from glass fibre-reinforced polypropylene, one of which has been reinforced with additional carbon fibre plies. ... -
An experimental study of a flow-accelerating hydrokinetic device
Mannion, Brian; McCormack, Vincent; Kennedy, Ciaran; Leen, Sean B.; Nash, Stephen (SAGE Publications, 2018-05-01)Tidal energy researchers and developers use experimental testing of scaled devices as a method of evaluating device performance. Much of the focus to date has been on horizontal axis turbines. This study is focused on a ... -
Fatigue life of pitch- and stall-regulated composite tidal turbine blades
Kennedy, Ciaran R.; Jaksic, Vesna; Leen, Sean B.; Ó Brádaigh, Conchúr M. (Elsevier, 2018-02-28)Tidal turbine blades are subject to harsh loading and environmental conditions, including large thrust and torsional loadings, relative to wind turbine blades, due to the high density of seawater, among other factors. The ... -
Finite element modelling for mitigation of residual stress and distortion in macro-scale powder bed fusion components
Zhou, Jinbiao; Barrett, Richard A.; Leen, Sean B. (SAGE Publications, 2022-12-23)Powder bed fusion (PBF) has attracted significant attention in many applications due to its capability of fabricating complex and customized metal parts. However, the potential for high inherent residual stresses that ... -
A high-fidelity crystal-plasticity finite element methodology for low-cycle fatigue using automatic electron backscatter diffraction scan conversion: Application to hot-rolled cobalt–chromium alloy
Tu, Yuhui; Leen, Sean B.; Harrison, Noel M. (SAGE Publications, 2021-05-11)The common approach to crystal-plasticity finite element modeling for load-bearing prediction of metallic structures involves the simulation of simplified grain morphology and substructure detail. This paper details a ... -
High-resolution measurements of leakage flow inside the hinge of a large-scale bileaflet mechanical heart valve hinge model
Klusak, Ewa; Quinlan, Nathan J. (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 ... -
In-situ SEM study of fatigue micro-crack initiation and propagation behavior in pre-corroded AA7075-T7651
Song, Haipeng; Liu, Changchun; Zhang, Hao; Du, Juan; Yang, Xudong; Leen, Sean B. (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 material inhomogeneity on the mechanical response of a tempered martensite steel
Li, Ming; Sun, F. W.; Barrett, Richard A.; Meade, E.; Li, D. F.; O'Donoghue, Padraic E.; Leen, Sean B.; O'Dowd, Noel P. (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 ...