1,722,409 research outputs found
An investigation of nanoindentation tests on the single crystal copper thin film via an AFM and MD simulation
No full textNanoindentation tests performed in an atomic force microscope have been utilized to directly measure the mechanical properties of single crystal metal thin films fabricated by the vacuum vapor deposition technique. Nanoindentation tests were conducted at various indentation depths to study the effect of indentation depths on the mechanical properties of thin films. The results were interpreted by using the Oliver-Pharr method with which direct observation and measurement of the contact area are not required. The elastic modulus of the single crystal copper film at various indentation depths was determined as 67.0±6.9GPa on average which is in reasonable agreement with the results reported by others. The indentation hardness constantly increases with decreasing indentation depth, indicating a strong size effect. In addition to the experimental work, a three-dimensional nanoindentation model of molecular dynamics (MD) simulations with embedded atom method (EAM) potential is proposed to elucidate the mechanics and mechanisms of nanoindentation of thin films from the atomistic point of view. MD simulations results also show that due to the size effect the plastic deformation via amorphous transformation is more favorable than via the generation and propagation of dislocations in nanoindentation of single crystal copper thin films
IMechE UAS Challenge 2016
No full textUniversity of Southampton particaption in IMechE UAS Challenge 2016 headed by Stephen Prio
The application of plasticity principles to friction
Get PDFThis paper presents a compelling analogy between the ideas of plastic shakedown and frictional shakedown. It introduces the frictional equivalent of the Bree diagram and classifies the different possible responses of a simple system to typical periodic or cyclic loading. © IMechE 2006
IMechE Design Challenge 2017 outline presentation
No full textOutline of IMechE Competitions and the 1st year UG annual Design Challenge Competition (2017) - Stephen Herd, 13 Jan'17 (6 presentation slides as 3 A4 pages - 2 slides per page) for Referenc
The application of asymptotic analysis for modes I and III semi-infinite wedge solutions to a circumferentially notched shaft
Get PDFMode I and mode III solutions for sharp notch roots are derived and compared with representative full-field solutions. The example geometry studied is a circumferentially notched shaft, loaded in both tension and torsion. The calibration for the notch root intensity factors has been carried out using the finite element method. The combined effects of tension and torsion have been briefly considered as an example. © IMechE 2005
Traces based Shock Visualisation in the Blade Passage of the Rotor of a Transonic Axial Compressor
No full textA new optical non intrusive technique to visualise the position and the structure of the shocks in a transonic axial compressor is presented. The number per volume density of particles which were added to the flow and with it the density of the fluid are visualised with a laser light sheet and an intensified CCD Camera. Structures like normal and oblique shocks, fork shock structures and separation regions were identified. The 3D-shock structure was acquired
Fuel consumption assessments of using a hot water storage strategy on a Diesel engine at different ambient temperatures
No full textInternational audienc
Optimisation of the hydrotesting sequence in tank farm construction using an adaptive genetic algorithm with stochastic preferential logic
No full textIn the construction of tank farms there is a requirement for the tanks to be hydro-tested in order to verify that they are leak proof as well as proving the lack of differential settlement in the foundations. The tanks will be required to be filled to a predetermined level and then to maintain this loaded state for a certain period of time before being drained. In areas such as the Middle East water for hydro-testing is not freely available as sea water is often not suitable for this purpose, so fresh water needs to be produced or transported to the construction site for this purpose. It is therefore of major benefit to the project to schedule the hydro-testing of the tanks in such a manner as to minimize the utilization of hydro-test water.
This problem is a special case of the Resource Constrained Project Scheduling Problem (RCPSP) and in this research we have modified our previously developed Fitness differential adaptive genetic algorithm [4, 6 & 7] to the solution of this real world problem.
The Algorithm has been ported from the original MATLAB code into Microsoft Project using VBA in order to provide a more user friendly, practical interface
Fuel consumption assessments of using a hot water storage strategy on a Diesel engine at different ambient temperatures
No full textInternational audienc
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