Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 6 of 6
Full-Text Articles in Engineering
Peak Effect In The Critical Current Of Type Ii Superconductors With Strong Magnetic Vortex Pinning, X B. Xu, H Fangohr, X N. Xu, M Gu, Z H Wang, S M. Ji, Shichao Ding, Dongqi Shi, S. X. Dou
Peak Effect In The Critical Current Of Type Ii Superconductors With Strong Magnetic Vortex Pinning, X B. Xu, H Fangohr, X N. Xu, M Gu, Z H Wang, S M. Ji, Shichao Ding, Dongqi Shi, S. X. Dou
Faculty of Engineering - Papers (Archive)
We perform 2D Langevin simulations studying the peak effect (PE) of the critical current taking into account the temperature dependence of the competing forces. We observe and report that the PE results from the competition of vortex-vortex interactions and vortex-pin interactions which have different temperature dependencies. The simulations reveal that the PE can take place only for certain pinning strengths, densities of pinning centres, and driving forces, which is in good agreement with experiments. No apparent vortex order-disorder transition is observed across the PE regime. In addition, the PE is a dynamical phenomenon, and thermal fluctuations can speed up the …
Effect Of Processing Schedule On The Microstructure And Texture Of 0.78wt% Cr Extra-Low-Carbon Steel, Elena V. Pereloma, Azdiar A. Gazder, John J. Jonas, Michael K. Miller, Christopher Hj Davies
Effect Of Processing Schedule On The Microstructure And Texture Of 0.78wt% Cr Extra-Low-Carbon Steel, Elena V. Pereloma, Azdiar A. Gazder, John J. Jonas, Michael K. Miller, Christopher Hj Davies
Faculty of Engineering - Papers (Archive)
An extra-low-carbon steel was alloyed with 0.78 wt% Cr and subjected to three different processing schedules involving: (i) warm rolling to 65 % reduction at 640°C, (ii) warm rolling to 80% reduction at 580°C and (iii) warm rolling to 65% reduction at 640°C followed by cold rolling to 40% reduction. Increasing the severity of the deformation resulted in an increase in the number of grains containing in-grain shear bands. X-ray bulk texture analysis indicates that the g -fibre intensity was slightly higher in the steel warm rolled at 580°C than at 640°C and after cold rolling. Transmission electron microscopy and …
The Effect Of Helical Pitch On The Behaviour Of Helically Confined Hsc Beams, Muhammad N. S Hadi, Nuri Elbasha
The Effect Of Helical Pitch On The Behaviour Of Helically Confined Hsc Beams, Muhammad N. S Hadi, Nuri Elbasha
Faculty of Engineering - Papers (Archive)
The strength and ductility of HSC beams are enhanced through the application of helical reinforcement located in the compressionregion of the beams. The pitch of helix is an important parameter controlling the level of strength and ductility enhancement of overreinforcedhigh strength concrete beams. This paper presents an experimental investigation of the effect of helix pitch on the beam behaviourthrough testing five helically confined full-scale beams. The helix pitches were 25, 50, 75, 100 and 160 mm. Beams cross section was200 · 300 mm, and with a length of 4 m and a clear span 3.6 m subjected to four point …
The Effect Of Confinement Shapes On Over-Reinforced Hsc Beams., Ross Jeffry, Muhammad N. S Hadi
The Effect Of Confinement Shapes On Over-Reinforced Hsc Beams., Ross Jeffry, Muhammad N. S Hadi
Faculty of Engineering - Papers (Archive)
High strength concrete (HSC) provides high strength but lower ductility than normal strength concrete. This low ductility limits the benefit of using HSC in building safe structures. On the other hand, when designing reinforced concrete beams, designers have to limit the amount of tensile reinforcement to prevent the brittle failure of concrete. Therefore the full potential of the use of steel reinforcement can not be achieved. This paper presents the idea of confining concrete in the compression zone so that the HSC will be in a state of triaxial compression, which leads to improvements in strength and ductility. Five beams …
The Effect Of Friction On Magnetorheological Fluids, W H. Li, X Z. Zhang
The Effect Of Friction On Magnetorheological Fluids, W H. Li, X Z. Zhang
Faculty of Engineering - Papers (Archive)
This paper presents an experimental approach to study the effect of friction on magnerorheological (MR) fluids. Both steady and dynamic modes were employed to investigate MR fluid behaviors. The experimental results indicate that the total MR effects are dominated by two factors: magnetic force and friction force. Conventionally, the magnetic force contribution to MR effect has been intensively studied while the friction force effect has attracted less attention. This study provides a method to quantitatively predict the friction contribution to the total MR effect. It may be used to effectively analyze enhanced MR effects reported by other groups. Also, it …
Coke Dissolution In Liquid Iron - The Effect Of Coke Mineral Matter, Michael Chapman, Brian J. Monaghan, Sharon A. Nightingale, John G. Mathieson, Robert J. Nightingale
Coke Dissolution In Liquid Iron - The Effect Of Coke Mineral Matter, Michael Chapman, Brian J. Monaghan, Sharon A. Nightingale, John G. Mathieson, Robert J. Nightingale
Faculty of Engineering - Papers (Archive)
Metallurgical coke, the primary fuel of the ironmaking blast furnace contains approximately 8-12% mineral matter and carbon. The formation and development of the mineral matter layer that formed between coke and liquid iron during carbon dissolution has been investigated. Coke particles (-2mm, +0.5mm) were added to the top surface of an iron 2 mass% C melt at representative ironmaking temperatures of 1450oC, 1500oC and 1550oC, for periods of time between 2 minutes and 120 minutes, before being quenched. The samples were then sectioned and the coke-iron interface examined in the SEM. The mineral matter layer that formed during the dissolution …