Browsing by Author "Stephenson, David J."

Browsing by Author "Stephenson, David J."

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  • The design and manufacture of biomedical surfaces 
    Ramsden, Jeremy J.; Allen, David M.; Stephenson, David J.; Alcock, Jeffrey R.; Peggs, G. N.; Fuller, G. D.; Goch, G. (Technische Rundschau, Hallwag Publishers; 1999, 2007-08-01)
    Surfaces are the primary place of contact between a biomaterial and its host organism. Typically, prostheses have to fulfil demanding structural and mechanical requirements, yet the material best for those functions may ...
  • Determining the onset of grinding burn using Magnetic Barkhausen Noise 
    Opoku, Kevin S (Cranfield University, 2005)
    A study of the quick non-destructive technique of Magnetic Barkhausen Noise (MBN) in detecting the onset of grinding burn in the absence of any microstructural changes during grinding has been undertaken. 51CrV4 Steel ...
  • Development of porous ceramic air bearings 
    Roach, Christopher James (Cranfield University, 2001-02)
    Porous air bearings enjoy some important advantages over conventional air bearing types such as increased load carrying capacity, higher stiffness and improved damping. However, these types of bearings have yet to ...
  • Development of porous-ceramic hydrostatic bearings 
    Durazo-Cardenas, Isidro (Cranfield University, 2003-10)
    Porous-ceramic hydrostatic bearings have been recently developed. These bearings have demonstrated an exceptional overall performance when compared with conventional technology bearings. However, despite all the benefits, ...
  • Electrolytic in-process dressing superfinishing of spherical bearings using metal-resin bond ultra-fine CBN wheels 
    Raffles, Mark H.; Stephenson, David J.; Shore, Paul; Jin, T. (Professional Engineering Publishing, 2011-01-01)
    The use of electrolytic in-process dressing (ELID) superfinishing has been investigated with the aim of substantially improving surface finish on spherical bearing balls as well as reducing process times. Using ELID in ...
  • Elid superfinishing of spherical bearings 
    Raffles, Mark H. (Cranfield University, 2007)
    Driven by a requirement to extend the lifespan of self-aligning lined spherical bearings, this research investigates the use of Elid (electrolytic in-process dressing) as a method of improving ball surface finish. Elid ...
  • Erosion - corrosion modelling of materials used in petroleum production 
    Hamzah, Razali Bin (Cranfield University, 1994-09)
    Experimental erosion/corrosion modelling was performed on C-Mn steels and corrosion resistant alloys commonly used in petroleum production. A graded commercial sand of 50-30b pm size range, similar to sands produced ...
  • Grinding processes and their effects on surface integrity 
    Comley, Paul (Cranfield University, 2005-03)
    The introduction of high performance grinding machines in combination with the latest superabrasive technology has the potential to impact significantly on existing process chains. The aim of the research was to look at ...
  • The impact of tool performance on micromachining capability 
    Zdebski, Daniel (Cranfield University, 2012-06)
    Micro-milling represents a versatile and fast manufacturing process suitable for production of fully 3D micro-components. Such components are demanded for a vast number of industrial applications including safety systems, ...
  • Investigation into the grinding of titanium alloys 
    Wang, S. H. (Cranfield University, 2000-07)
    Titanium alloys are used extensively in the aerospace industry due to their high specific strength and excellent corrosion resistance. However, their poor thermal conductivity and high chemical reactivity with tool ...
  • Machining of Optical Surfaces in Brittle Materials using an Ultra-Precision Machine Tool 
    Shore, Paul (Cranfield University, 1995-03)
    Investigations of machining optical surfaces into brittle materials using an ultra precision machine tool are presented. The newly developed ultra precision NION machine is evaluated to gain a good appreciation of its ...
  • Machining surfaces of optical quality by hard turning 
    Knuefermann, Markus M. W. (Cranfield UniversitySchool of Industrial and Manufacturing Science, 2003-11)
    The main aim of this work was the machining by hard turning of surfaces with optical surface quality. A numerical target had been set as a surface roughness Ra = 10nm. It has been shown that achieving roughness of that ...
  • The Mechanism of Dross Formation on Aluminium and Aluminium Magnesium Alloys 
    Impey, S. A. (Cranfield University, 1989-12)
    Metal loss is an unavoidable consequence of the large scale melting of aluminium and its alloys. The objective of such processing must be to minimise losses, both from an economic viewpoint and to ensure optimum quality ...
  • Nano-level surface generation on H13 alloy steel by ultra-precision grinding with electrolytic in-process dressing 
    Javaid, N.; Stephenson, David J.; Vitanov, V. I. (2010-09-16)
    The aim of this work was to achieve the surface finish of 10nm on a 40mm diameter disc of chrome-molybdenum-vanadium alloyed steel (H13) by using precision grinding process with electrolytic in-process dressing. The ...
  • A new powder encapsulation method and its implications on densification by hot isostatic pressing 
    Downing, M. (Cranfield University, 1993-04)
    Hot isostatic pressing is now an accepted material processing technique for the consolidation of metal powders to near-net-shape components. This thesis examines the use of coatings as in-situ envelopes to overcome the ...
  • The performance of a porous ceramic hydrostatic journal bearing 
    Durazo-Cardenas, Isidro; Corbett, John; Stephenson, David J. (Professional Engineering Publishing, 2010)
    The performance of a porous-ceramic hydrostatic journal bearing manufactured by the starch consolidation (SC) technique has been examined using a highly instrumented test rig. The results have been compared with those ...
  • Permeability and dynamic elastic moduli of controlled porosity ultra-precision aerostatic structures 
    Durazo-Cardenas, Isidro; Corbett, John; Stephenson, David J. (Elsevier Science B.V., Amsterdam., 2014-03-03)
    Porous ceramic aerostatic bearings enable precise and smooth motion and improved stiffness compared with widely used orifice restrictor bearings. However, the processing techniques so far used are too complex or rely in ...
  • Powder co-injection moulding 
    Hanson, S. M. J. (Cranfield University, 2000-09)
    A novel powder processing technique has been developed by combining conventional powder injection moulding with polymer co-injection moulding, to permit the in-situ surface engineering of metal or ceramic components as ...
  • Precision Grinding for Rapid Manufacturing of Large Optics 
    Tonnellier, Xavier (Cranfield University, 2009-05)
    Large scale nuclear fusion and astronomy scientific programmes have increased the demand for large freeform mirrors and lenses. Thousands of one metre class, high quality aspherical optical components are required within ...
  • Predictive grinding process optimisation and monitoring 
    Leeson, David Christopher (2005-09-09)
    Grinding is one of the oldest and most important metal removal processes, and is capable of high dimensional and surface finish tolerances. It is a complex and expensive process; industry has much to gain by increasing ...