Browsing Mechanical Engineering (Scholarly Articles) by Author "Leen, Sean B."
Now showing items 21-40 of 88
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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 high-temperature corrosion on the service life of P91 piping in biomass co-firing
O'Hagan, C.; Barrett, Richard A.; Leen, Sean B.; Monaghan, Rory F.D. (American Society of Mechanical Engineers (ASME), 2016-02-24)Co-firing biomass with traditional fuels is becoming increasingly relevant to thermal power plant operators due to increasingly stringent regulations on greenhouse gas emissions. It has been found that when biomass is ... -
The effect of inclusions on the high‐temperature low‐cycle fatigue performance of cast MarBN: Experimental characterisation and computational modelling
O'Hara, E. M.; Harrison, Noel M.; Polomski, B.K.; Barrett, R.A.; Leen, Sean B. (Wiley, 2018-06-15)The presence of inclusions is a known source of crack initiation and component failure in cast materials. In this work, the role of inclusions is investigated via a combined program of high-temperature low-cycle fatigue ... -
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 ... -
The effect of slip regime on fretting wear-induced stress evolution
Ding, J.; Leen, Sean B.; McColl, I.R. (Elsevier, 2004-02-20)A numerical approach to simulate fretting wear, based on a modified version of the Archard equation, is applied to a cylinder-on-flat fretting configuration for gross sliding and partial slip conditions. The evolution of ... -
The effect of the beta phase on the micromechanical response of dual-phase titanium alloys
Ashton, Patrick J.; Jun, Tea-Sung; Zhang, Zhen; Britton, T. Benjamin; Harte, Annette M.; Leen, Sean B.; Dunne, Fionn P.E. (Elsevier, 2017-03-24)This paper investigates the role of beta phase on the micro-mechanical behaviour of dual-phase titanium alloys, with particular emphasis on the phenomenon of cold dwell fatigue, which occurs in such alloys under room ... -
Effect of welding on microstructure and mechanical response of X100Q bainitic steel through nanoindentation, tensile, cyclic plasticity and fatigue characterisation
Devaney, Ronan J.; O'Donoghue, Padraic E.; Leen, Sean B. (Elsevier, 2020-12-30)This paper presents an experimental characterisation of fatigue at welded connections for the next-generation high-strength low-alloy offshore riser steel, X100Q. An instrumented girth weld is conducted with a parallel ... -
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 and computational characterization of the effect of manufacturing-induced defects on high temperature, low-cycle fatigue for MarBN
O'Hara, Eimear M.; Phelan, B.; Osgerby, S.; Barrett, Richard A.; Raghavendra, R.; Leen, Sean B.; Harrison, Noel M. (Elsevier, 2020-05-22)Manufacturing-induced defects are a key source of crack initiation and component failure under high temperature cyclic loading. In this work, 3D X-ray micro-computed tomography and microstructural analysis of manufacturing-induced ... -
Experimental and numerical characterisation of the cyclic thermo-mechanical behaviour of a high temperature forming tool alloy
Leen, Sean B. (American Society of Mechanical Engineers, 2010-10-05)This paper describes high temperature cyclic and creep relaxation testing and modeling of a high nickel-chromium material (XN40F) for application to the life prediction of superplastic forming (SPF) tools. An experimental ... -
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 on damage evolution in pre-corroded aluminum alloy 7075-T7651 under fatigue loading
Song, Haipeng; Liu, Changchun; Zhang, Hao; Yang, Xudong; Chen, Yajun; Leen, Sean B. (Elsevier, 2020-09-01)This paper experimentally investigates the fatigue damage evolution in pre-corroded aluminum alloy (AA) 7075-T7651 via digital image correlation (DIC) and scanning electron microscopy (SEM). Three stages of fatigue damage ... -
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 ... -
An experimental study on the key fretting variables for flexible marine risers
O'Halloran, Sinéad; Harte, Annette M.; Shipway, Philip H.; Leen, Sean B. (Elsevier, 2017-07-02)This paper presents an experimental investigation into the effects of contact conformity, contact pressure and displacement amplitude on the gross-slip fretting behaviour grease-lubricated cylinder-on-flat contacts in the ... -
Fatigue damage characterisation of MarBN steel for high temperature flexible operating conditions
O'Hara, Eimear M.; Harrison, Noel M.; Polomski, B. K.; Barrett, Richard A.; Leen, Sean B. (SAGE Publications, 2016-09-10)This article is concerned with the high temperature low cycle fatigue behaviour of a new nano-strengthened martensiticferritic steel, MarBN. A range of strain-controlled, low cycle fatigue tests are presented on MarBN at ... -
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 ...