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Modelling fracture of aged graphite bricks under radiation and temperature (2017)
Journal Article
Hashim, A., Kyaw, S., & Sun, W. (2017). Modelling fracture of aged graphite bricks under radiation and temperature. Nuclear Materials and Energy, 11, 3-11. https://doi.org/10.1016/j.nme.2017.03.038

The graphite bricks of the UK carbon dioxide gas cooled nuclear reactors are subjected to neutron irradiation and radiolytic oxidation during operation which will affect thermal and mechanical material properties and may lead to structural failure. I... Read More about Modelling fracture of aged graphite bricks under radiation and temperature.

Evolution of plasticity-based wear damage in gross sliding fretting of a Ti-6Al-4V non-conforming contact (2017)
Journal Article
Mohd Tobi, A., Sun, W., & Shipway, P. (in press). Evolution of plasticity-based wear damage in gross sliding fretting of a Ti-6Al-4V non-conforming contact. Tribology International, 113, https://doi.org/10.1016/j.triboint.2017.01.010

This paper examines the evidence for a plasticity based wear mechanism in the fretting wear of Ti-6Al-4V. Driven by near-surface plastic strain accumulation, the generation of wear debris evolves from coarse metallic debris towards loose fine oxide d... Read More about Evolution of plasticity-based wear damage in gross sliding fretting of a Ti-6Al-4V non-conforming contact.

Investigation on the plasticity accumulation of Ti-6Al-4V fretting wear by decoupling the effects of wear and surface profile in finite element modelling (2016)
Journal Article
Tobi, A. M., Sun, W., & Shipway, P. (in press). Investigation on the plasticity accumulation of Ti-6Al-4V fretting wear by decoupling the effects of wear and surface profile in finite element modelling. Tribology International, https://doi.org/10.1016/j.triboint.2016.12.009

A finite-element-based wear modelling methodology and a computational device for decoupling wear effects is presented in this study. The decoupling of wear effects facilitates the capture of plasticity accumulation on a particular wear-scarring profi... Read More about Investigation on the plasticity accumulation of Ti-6Al-4V fretting wear by decoupling the effects of wear and surface profile in finite element modelling.

The roles of contact conformity, temperature and displacement amplitude on the lubricated fretting wear of a steel-on-steel contact (2016)
Journal Article
Warmuth, A., Sun, W., & Shipway, P. (2016). The roles of contact conformity, temperature and displacement amplitude on the lubricated fretting wear of a steel-on-steel contact. Royal Society Open Science, 3(10), Article 150637. https://doi.org/10.1098/rsos.150637

This paper investigates the effect of contact geometry, temperature and displacement amplitude on the fretting behaviour of an aero-turbo oil lubricated cylinder-on-flat contact. To be effective, the lubricant needed both to penetrate the contact and... Read More about The roles of contact conformity, temperature and displacement amplitude on the lubricated fretting wear of a steel-on-steel contact.

Finite element modelling strategies of weld repair in pre-stressed thin components (2016)
Journal Article
Salerno, G., Bennett, C., Sun, W., & Becker, A. A. (in press). Finite element modelling strategies of weld repair in pre-stressed thin components. Journal of Strain Analysis for Engineering Design, 51(8), https://doi.org/10.1177/0309324716666436

A total of two computational procedures have been developed in the commercial finite element software codes Sysweld and ABAQUS to analyse and predict the residual stress state after the repair of small weld defects in thin structural components. The... Read More about Finite element modelling strategies of weld repair in pre-stressed thin components.

Finite element analysis and experimental study of plastic lattice structures manufactured by selective laser sintering (2016)
Journal Article
Sun, W., & Choo, H. L. (2017). Finite element analysis and experimental study of plastic lattice structures manufactured by selective laser sintering. Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, 231(1-2), https://doi.org/10.1177/1464420716662296

The availability of additive manufacturing technologies in particular the selective laser sintering process has enabled the fabrication of high strength, lightweight and complex cellular lattice structures. In this study, the effective mechanical pro... Read More about Finite element analysis and experimental study of plastic lattice structures manufactured by selective laser sintering.

Effects of surface roughness on thermo-mechanical fatigue life of a P91 power plant steel (2016)
Journal Article
Kyaw, S. T., Rouse, J. P., Lu, J., & Sun, W. (in press). Effects of surface roughness on thermo-mechanical fatigue life of a P91 power plant steel. https://doi.org/10.1016/j.prostr.2016.06.086

P91 martensitic steel has now been widely used for power plant components such as steam pipe sections and headers. With the shift to renewable sources, traditional fossil power plants are increasingly expected to operate under so called “two shifting... Read More about Effects of surface roughness on thermo-mechanical fatigue life of a P91 power plant steel.

Multiaxial viscoplasticity modelling of power plant steel (2016)
Journal Article
Saad, A. A., Sun, W., & Tobi, A. M. (in press). Multiaxial viscoplasticity modelling of power plant steel. Key Engineering Materials, 701, https://doi.org/10.4028/www.scientific.net/KEM.701.230

The thermo-mechanical fatigue (TMF) of power plant components is caused by the cyclic operation of power plant. A time-dependent plasticity model can be used to simulate the component response under cyclic thermo-mechanical loading. This paper is con... Read More about Multiaxial viscoplasticity modelling of power plant steel.

On the effects of friction modelling on small punch creep test responses: a numerical investigation (2016)
Journal Article
Cortellino, F., Sun, W., & Hyde, T. (in press). On the effects of friction modelling on small punch creep test responses: a numerical investigation. Journal of Strain Analysis for Engineering Design, 51(7), https://doi.org/10.1177/0309324716655661

This paper shows the results of finite element (FE) analyses of Small Punch Creep Testing (SPCT) of a P91 steel at 600°C using two different approaches to model the friction between the specimen and the punch. The numerical results obtained by using... Read More about On the effects of friction modelling on small punch creep test responses: a numerical investigation.

Determination of material parameters for a unified viscoplasticity-damage model for a P91 power plant steel (2016)
Journal Article
Kyaw, S. T., Rouse, J. P., Lu, J., & Sun, W. (2016). Determination of material parameters for a unified viscoplasticity-damage model for a P91 power plant steel. International Journal of Mechanical Sciences, 115-116, https://doi.org/10.1016/j.ijmecsci.2016.06.014

Societal pressures are mounting on electricity operators to operate traditional fossil-fuel power plants in an efficient and flexible manner in conjunction with renewable power plants. This requires the uses of high frequency start up – shut down loa... Read More about Determination of material parameters for a unified viscoplasticity-damage model for a P91 power plant steel.

A study on the evolution of the contact angle of small punch creep test of Ductile materials (2016)
Journal Article
Cacciapuoti, B., Sun, W., & McCartney, D. (in press). A study on the evolution of the contact angle of small punch creep test of Ductile materials. International Journal of Pressure Vessels and Piping, https://doi.org/10.1016/j.ijpvp.2016.06.002

The work discussed in the present paper reports a novel investigation of the applicability of Chakrabarty's theory, for membrane stretching of a circular blank over a rigid punch, to small punch creep test (SPCT). The Chakrabarty solution was compare... Read More about A study on the evolution of the contact angle of small punch creep test of Ductile materials.

Derivation of a wear scar geometry-independent coefficient of friction from fretting loops exhibiting non-Coulomb frictional behaviour (2016)
Journal Article
Jin, X., Sun, W., & Shipway, P. (2016). Derivation of a wear scar geometry-independent coefficient of friction from fretting loops exhibiting non-Coulomb frictional behaviour. Tribology International, 102, 561-568. https://doi.org/10.1016/j.triboint.2016.06.012

One source of variation of the sliding tractional force in a gross-slip fretting cycle is the geometrical interaction of the developing wear scars on the opposing specimens. An existing model has been developed to include the compliance of the fretti... Read More about Derivation of a wear scar geometry-independent coefficient of friction from fretting loops exhibiting non-Coulomb frictional behaviour.

The role of geometry changes and debris formation associated with wear on the temperature field in fretting contacts (2016)
Journal Article
Jin, X., Sun, W., & Shipway, P. (2016). The role of geometry changes and debris formation associated with wear on the temperature field in fretting contacts. Tribology International, 102, https://doi.org/10.1016/j.triboint.2016.05.043

The temperature of a fretting contact is known to be a key factor in its development. However, as a test proceeds, the wear scar changes, both geometrically and through the formation of oxide-based debris-beds. Accordingly, the effects of these on th... Read More about The role of geometry changes and debris formation associated with wear on the temperature field in fretting contacts.

Analysis of shape and location effects of closely spaced metal loss defects in pressurised pipes (2016)
Journal Article
Al Owaisi, S., Becker, A. A., & Sun, W. (2016). Analysis of shape and location effects of closely spaced metal loss defects in pressurised pipes. Engineering Failure Analysis, 68, https://doi.org/10.1016/j.engfailanal.2016.04.032

Metal loss due to corrosion is a serious threat to the integrity of pressurised oil and gas transmission pipes. Pipe metal loss defects are found in either single form or in groups (clusters). One of the critical situations arises when two or more de... Read More about Analysis of shape and location effects of closely spaced metal loss defects in pressurised pipes.

Effect of large deformation on creep property evaluation by small-specimen bending tests (2016)
Journal Article
Tu, S., Zhuang, F., Zhou, G., & Sun, W. (2016). Effect of large deformation on creep property evaluation by small-specimen bending tests. International Journal of Pressure Vessels and Piping, 139-140, https://doi.org/10.1016/j.ijpvp.2016.02.009

For small-specimen bending creep tests, large deformation occurs inevitably when the specimen under a large load or a long creep time. In such a circumstance, the conventional method for creep property evaluation, which is based on the small deformat... Read More about Effect of large deformation on creep property evaluation by small-specimen bending tests.

Use of small specimen creep data in component life management: a review (2016)
Journal Article
Craddock Dyson, C., Sun, W., Hyde, C. J., Brett, S. J., & Hyde, T. H. (2016). Use of small specimen creep data in component life management: a review. Materials Science and Technology, 32(15), 1567-1581. https://doi.org/10.1080/02670836.2015.1132536

Small specimen creep testing techniques are novel mechanical test techniques that have been developed over the past 25 years. They mainly include the sub-size uniaxial test, the small punch creep test, the impression creep test, the small ring creep... Read More about Use of small specimen creep data in component life management: a review.

Characterisation of material property variation across an inertia friction welded CrMoV steel component using the inverse analysis of nanoindentation data (2016)
Journal Article
Iracheta, O., Bennett, C., & Sun, W. (in press). Characterisation of material property variation across an inertia friction welded CrMoV steel component using the inverse analysis of nanoindentation data. International Journal of Mechanical Sciences, 107, https://doi.org/10.1016/j.ijmecsci.2016.01.023

In this study, a new application of the inverse analysis of the depth-sensing indentation technique based on the optimization theory has been satisfactorily demonstrated. The novel approach for determining the mechanical properties from experimental... Read More about Characterisation of material property variation across an inertia friction welded CrMoV steel component using the inverse analysis of nanoindentation data.

Numerical study of the effects of crack location on creep crack growth in weldment (2016)
Journal Article
Saber, M., Sun, W., & Hyde, T. (2016). Numerical study of the effects of crack location on creep crack growth in weldment. Engineering Fracture Mechanics, 154, https://doi.org/10.1016/j.engfracmech.2016.01.010

A numerical study on the effects of crack location on creep crack growth, in a P91 weldment, was carried out using a finite element package (ABAQUS). Models of compact tension specimens were used. The obtained results showed that, the creep crack gro... Read More about Numerical study of the effects of crack location on creep crack growth in weldment.

Material characterization and finite element modelling of cyclic plasticity behavior for 304 stainless steel using a crystal plasticity model (2015)
Journal Article
Lu, J., Sun, W., & Becker, A. A. (2016). Material characterization and finite element modelling of cyclic plasticity behavior for 304 stainless steel using a crystal plasticity model. International Journal of Mechanical Sciences, 105, https://doi.org/10.1016/j.ijmecsci.2015.11.024

Low cycle fatigue tests were carried out for a 304 stainless steel at room temperature. A series of experimental characterisations, including SEM, TEM, and XRD were conducted for the 304 stainless steel to facilitate the understanding of the mechanic... Read More about Material characterization and finite element modelling of cyclic plasticity behavior for 304 stainless steel using a crystal plasticity model.

Residual stress distribution in a Ti-6Al-4V T-joint weld measured using synchrotron X-ray diffraction (2015)
Journal Article
Xu, L., Zhang, S., Sun, W., McCartney, D. G., Hyde, T. H., James, J., & Drakopoulos, M. (2015). Residual stress distribution in a Ti-6Al-4V T-joint weld measured using synchrotron X-ray diffraction. Journal of Strain Analysis for Engineering Design, 50(7), 445-454. https://doi.org/10.1177/0309324715599462

To improve the manufacturing quality of welded structures, to prevent failures at weld joints and to predict their lifetime, measurements of the residual stresses generated by welding in the structures are extremely useful. The residual stresses may... Read More about Residual stress distribution in a Ti-6Al-4V T-joint weld measured using synchrotron X-ray diffraction.