Browsing Mechanical Engineering (Scholarly Articles) by Author "|~|"
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Auditing best practice for effective product innovation management
Cormican, Kathryn; O'Sullivan, David (Science Direct, 2004-10)Over the past number of years, researchers and industrialists have recognised the need for and the importance of developing approaches to enhance competitive advantage in new product development. However, the product ... -
A collaborative knowledge management tool for product innovation management
Cormican, Kathryn; O'Sullivan, David (Inderscience Publishers, 2003)Contemporary business systems are becoming increasingly competitive. Faster and smarter technology, although imperative, is not enough to survive in dynamic environments. Modern enterprises must adopt a deliberate and ... -
A combined XFEM and cohesive zone model for composite laminate microcracking and permeability
Grogan, DM,Bradaigh, CMO,Leen, SB; Grogan, David M.; Ó Brádaigh, Conchúr M. (Elsevier ScienceDirect, 2014-10-07)A novel computational methodology for predicting three-dimensional microcracking and permeability in composite laminates is presented, The methodology simulates microcrack initiation and propagation using the extended ... -
Computational study on the effect of contact geometry on fretting behaviour
McHugh, Peter; Zhang, Teng; Lean, Sean (Elsevier ScienceDirect, 2011-07-23)A key challenge in the design of engineering couplings and contacting components relates to the development of an understanding of the comparative performance of contrasting contact geometries for a given application, ... -
A critical analysis of plastic flow behaviour in axisymmetric isothermal and Gleeble compression testing
Bennett, CJ,Leen, SB,Williams, EJ,Shipway, PH,Hyde, TH; Leen, Sean B. (Elsevier ScienceDirect, 2010-08-16)Coupled thermo-mechanical finite element modelling of both isothermal axisymmetric compression and compression testing using the Gleeble thermo-mechanical simulator has been carried out in order to compare the levels of ... -
Cyclic thermo-mechanical material modelling and testing of 316 stainless steel
Leen, Sean B. (Elsevier ScienceDirect, 2010-04-20)A programme of cyclic mechanical testing of a 316 stainless steel, at temperatures of up to 600 C under isothermal conditions, for the identification of material constitutive constants, has been carried out using a ... -
Cyclic viscoplasticity testing and modelling of a service-aged P91 steel
Farragher, Tadhg P.; Leen, Sean B. (American Society of Mechanical Engineers, 2014-04-16)A service-aged P91 steel was used to perform an experimental program of cyclic mechanical testing in the temperature range of 400 °C–600 °C, under isothermal conditions, using both saw-tooth and dwell (inclusion of a ... -
Damage and permeability in tape-laid theromplastic composite cryogenic tanks.
Grogan, David M.; Ó Brádaigh, Conchúr M.; McGarry, J. P.; Leen, Sean B. (2015-09-07) -
Damage characterisation of cryogenically cycled carbon fibre/PEEK laminates
Grogan, David M.; Leen, Sean B.; Ó Brádaigh, Conchúr M. (Elsevier ScienceDirect, 2014-08-14)A unique insight into damage formation in CF/PEEK laminates before, during and after cryogenic cycling, using optical microscopy and 3D X-ray computed tomography (CT), is presented. Thicker laminates were found to exhibit ... -
Design of composite tidal turbine blades
Grogan, David M.; Leen, Sean B.; Kennedy, Ciaran; Ó Brádaigh, Conchúr M. (2013-02-24)Tidal turbine blades are subjected to significant thrust and torsional loadings due to the high density ofthe seawater in which they operate. These thrust loadings lead to high bending moments at the bladeroot, which can ... -
Developing a scorecard for enterprise knowledge management
Cormican, Kathryn (2002-05-19)Enterprise knowledge management is becoming a critical component of competitive success. Managers must ensure that they can successfully generate, leverage and reuse knowledge assets in their organisations. In this view, ... -
Development of life assessment procedures for power plant headers operated under flexible loading scenarios
Farragher, Tadhg P.; Leen, Sean B. (Elsevier ScienceDirect, 2013-12-22)A finite element methodology for thermo-mechanical fatigue analysis of a subcritical power plant outlet header under realistic loading conditions is presented. The methodology consists of (i) a transient heat transfer ... -
A dislocation-based model for high temperature cyclic viscoplasticity of 9-12Cr steels
Barrett, Richard A.; O'Donoghue, Peter E.; Leen, Sean B. (Elsevier ScienceDirect, 2015-06-22)A dislocation-based model for high temperature cyclic viscoplasticity in 9–12Cr steels is presented. This model incorporates (i) cyclic softening via decrease in overall dislocation density, loss of low angle boundary ... -
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 ... -
Finite element modelling of brittle fracture of thick coatings under normal and tangential loading
Leen, Sean B. (Elsevier ScienceDirect, 2012-09-12)This paper addresses coating fracture in hard brittle coatings subjected to combined normal and tangential loads through a finite element based methodology. The coating is modelled as an elastic layer perfectly bonded to ... -
Finite element modelling of damage in superplastic forming of a titanium alloy
Leen, Sean B. (Springer Verlag, 2009-12-15)This paper describes the application of a continuum damage mechanics methodology to the prediction of failure during superplastic forming of Ti-6Al-4V. A power law constitutive relationship is employed within a geometrically ... -
Finite element prediction of creep-plastic ratchetting and low cycle creep-fatigue for a large SPF tool
Leen, Sean B. (Springer Verlag, 2010-03-03)Industrial experience shows that large superplastic forming (SPF) tools suffer from distortion due to thermal cycling, which apparently causes high temperature creep and plasticity. In addition to distortion, thermomechanical ... -
Finite element simulation of fretting wear and fatigue in thin steel wires
Leen, Sean B. (Elsevier ScienceDirect, 2013-05-09)This paper studies the effect of fretting on fatigue life reduction of thin steel wires, using the frictionally-induced multiaxial contact stresses obtained from a finite element wear model, validated in previous work. The ... -
A finite element study of microstructure-sensitive plasticity and crack nucleation in fretting
McCarthy, Oliver J.; McGarry, J. P.; Leen, Sean B. (Elsevier ScienceDirect, 2011)This paper is concerned with finite element modelling of microstructure-sensitive plasticity and crack initiation in fretting. The approach adopted is based on an existing method for microstructure-sensitive (uniaxial) ... -
Fluid dynamics of gas exchange in high-frequency oscillatory ventilation: In vitro investigations in idealized and anatomically realistic airway bifurcation models
Heraty, Kevin B.; Laffey, John G.; Quinlan, Nathan J. (Springer, 2008-11)The objective of this work is to develop understanding of the local fluid dynamic mechanisms that underpin gas exchange in high-frequency oscillatory ventilation (HFOV). The flow field during HFOV was investigated ...