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Articles 1 - 7 of 7
Full-Text Articles in Engineering
State Dependent Properties Of Rail Pads, Sakdirat Kaewunruen, Alexander Remennikov
State Dependent Properties Of Rail Pads, Sakdirat Kaewunruen, Alexander Remennikov
Faculty of Engineering - Papers (Archive)
Rail pad is one of the main components in ballasted railway track systems. It is inserted between the rail and the sleeper to attenuate dynamic wheel/rail interaction forces, preventing the underlying railway track components from excessive stresses. Generally, the dynamic design of tracks relies on the available data, which are mostly focused on the structural condition at a specific toe load. Recent findings show that track irregularities could significantly amplify the loads on railway tracks. This phenomenon gives rise to a concern that the rail pads may experience higher deterioration rate than anticipated in the past. On this ground, an …
The Wetting Of Liquid Iron Carbon On Aluminate Minerals Formed During Coke Dissolution In Iron, B. J. Monaghan, M. Chapman, S A. Nightingale
The Wetting Of Liquid Iron Carbon On Aluminate Minerals Formed During Coke Dissolution In Iron, B. J. Monaghan, M. Chapman, S A. Nightingale
Faculty of Engineering - Papers (Archive)
From previous studies by the authors on the effects of mineral layer formation at coke-iron boundary during coke dissolution it was found that the composition and morphology of the layer had a profound affect on the kinetics of reaction. Moreover it was found that the layer was primarily composed of calcium aluminate’s that over time (0-120 minutes) became progressively enriched with calcium. The minerals identified in the layer were alumina, CA6, CA2 and CA. Given that coke dissolution in iron is a heterogeneous reaction it can be expected that the wetting of iron on these minerals would have a significant …
Dynamic Properties Of Railway Track And Its Components : A State-Of-The-Art Review, Sakdirat Kaewunruen, Alexander Remennikov
Dynamic Properties Of Railway Track And Its Components : A State-Of-The-Art Review, Sakdirat Kaewunruen, Alexander Remennikov
Faculty of Engineering - Papers (Archive)
Recent findings indicate one of major causes of damages, which is attributed to the resonant behaviours, in a railway track and its components. Basically, when a railway track is excited to generalised dynamic loading, the railway track deforms and then vibrates for certain duration. Dynamic responses of the railway track and its components are the key to evaluate the structural capacity of railway track and its components. If a dynamic loading resonates the railway track’s dynamic responses, its components tend to have the significant damage from excessive dynamic stresses. For example, a rail vibration could lead to defects in rails …
Response Characterization Of Electroactive Polymers As Mechanical Sensors, G. Alici, Geoffrey M. Spinks, J. D. Madden, Y. Wu, G G. Wallace
Response Characterization Of Electroactive Polymers As Mechanical Sensors, G. Alici, Geoffrey M. Spinks, J. D. Madden, Y. Wu, G G. Wallace
Faculty of Engineering - Papers (Archive)
The characterization of the dynamic response (including transfer function identification) of trilayer polypyrrole (PPy) type conducting polymer sensors is presented. The sensor was built like a cantilever beam with the free end stimulated through a mechanical lever system, which provided displacement inputs. The voltage generated and current passing between the two outer PPy layers as a result of the input was measured to model the output/input behavior of the sensors based on their experimental current/displacement and voltage/displacement frequency responses. We specifically targeted the low-frequency behavior of the sensor as it is a relatively slowsystem. Experimental transfer function models were generated …
Determination Of The Thermal Histories Of Coke In A Blast Furnace Through X-Ray Analysis, B. J. Monaghan, Robert J. Nightingale, V. Daly, E. Fitzpatrick
Determination Of The Thermal Histories Of Coke In A Blast Furnace Through X-Ray Analysis, B. J. Monaghan, Robert J. Nightingale, V. Daly, E. Fitzpatrick
Faculty of Engineering - Papers (Archive)
A study has been undertaken to identify the source of coke fines sampled from the deadman area of the blast furnace. Using measurements of the coke crystallite dimension LC, it was established that some of the fines found in the deadman area of a blast furnace were not simply the degradation products of the lump coke in this area. The LC was measured using standard X-ray analysis techniques. The coke fines had a higher LC than the coke lump and therefore have experienced a higher maximum temperature than the associated coke lump. This finding has been interpreted as at least …
Formation Of A Mineral Layer During Coke Dissolution Into Liquid Iron And Its Influence On The Kinetics Of Coke Dissolution Rate, M. Chapman, B. J. Monaghan, S A. Nightingale, J. Mathieson, Robert J. Nightingale
Formation Of A Mineral Layer During Coke Dissolution Into Liquid Iron And Its Influence On The Kinetics Of Coke Dissolution Rate, M. Chapman, B. J. Monaghan, S A. Nightingale, J. Mathieson, Robert J. Nightingale
Faculty of Engineering - Papers (Archive)
The formation and development of the mineral layer that forms between coke and liquid iron during carbon dissolution has been characterised. Coke particles (-2mm, +0.5mm) were added to the top surface of an iron 2 mass% C melt at representative ironmaking temperatures, for periods of time between 2 minutes and 120 minutes, before being quenched. The quenched samples were then sectioned and the solidified coke-melt interfacial region analysed in the SEM. Analysis showed that a mineral layer was present at the interface at all experimental temperatures (1450-1550oC) from 2 minutes and persisted beyond 120 minutes. The mineral layer was found …
Kinetics Of Spinel Formation And Growth During Dissolution Of Mgo In Cao-Al2o3-Sio2 Slag, Sharon Nightingale, B. J. Monaghan
Kinetics Of Spinel Formation And Growth During Dissolution Of Mgo In Cao-Al2o3-Sio2 Slag, Sharon Nightingale, B. J. Monaghan
Faculty of Engineering - Papers (Archive)
The formation and growth of MgAl2O4 spinel crystals on a single crystal MgO substrate submerged in a 40% CaO, 40% SiO2 and 20% Al2O3 slag was directly observed using high temperature microscopy. This showed that the crystals initially form on the MgO surface, but may break off and be carried out into the liquid slag. Still pictures extracted from digitally recorded images were used to measure the size of these crystals at 1420, 1440 and 1460oC as a function of time. Growth of the crystals was found to follow the parabolic rate law, with rates increasing with temperature. An estimate …