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  • 1975-1979  (1,940)
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  • 1
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The previously published theory of our model on the evolution of a surface contour under ion etching is recalled. Further improvements dealing with angular points of the profile shows that: angular points having straight trajectory may exist; and they can be found either by computation or by graphic method. The experimental verification of the model is made on steps etched in silicon. SEM observations of the evolution of such steps under argon ion bombardment show good agreement between computed and experimental results.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 10 (1975), S. 12-24 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The variation of fracture and mechanical properties of epoxy resin Epikote 828, cured with diaminodiphenyl-methane by variation of the resin/amine ratio has been determined. Observations of the crack tip have shown that fracture toughness variations can be attributed to the different blunting characteristics of the various resin/amine compositions. A systematic variation in the thermal transitions of the resins also occurs as a function of composition. Investigations by chemical etching and small angle X-ray scattering have failed to reveal a structural entity which can be invoked to explain the trends in fracture and mechanical properties. It has been found that care must be taken when choosing the method of evaluation of fracture parameters in order that meaningful comparisons can be made between different resin compositions.
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  • 3
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The semi-crystalline polymer TPX has been injection moulded into standard tensile bars using a range of barrel temperatures, mould temperatures and injection pressures. Acid etching, microhardness testing and selected volume X-ray pole figures were used to characterize the changes in microstructure and crystalline texture which occurred throughout the range of mouldings. A strong correlation was shown to exist between microstructure and crystalline texture and processing conditions. Three-point bend tests on the injection moulded bars indicated that a ductile-to-brittle transition in failure mode could be induced by changing the moulding conditions, and that this change could be correlated with microstructural and dimensional changes.
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  • 4
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The tensile strength of an Ni-Al-Cr-C eutectic composite which has an Ni-rich matrix containing a dispersion of Ni3Al precipitates has been measured both with a fully-aligned and a cellular microstructure. The fully-aligned eutectic behaves as a simple metal-matrix composite. The reduction in strength of the cellular eutectic due to the off-axis reinforcement is shown by a simple analysis to result from weakness of the fibre/matrix interface which is borne out by observations of the fracture surface.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 10 (1975), S. 7-11 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A floating magnet model [5, 6] originally devised for simulating effects in superconductors has been modified to simulate metal and alloy lattices. The model shows grain boundaries, edge dislocations and point defects in the metal lattice, demonstrating the pinning of dislocations by impurity atoms and the drift of impurities to grain boundaries. Although the alloy was disordered for most concentrations, a stable ordered square lattice was formed readily at equal proportions of the two atoms. Defects, particularly dislocations, were more complicated in the ordered alloy than in the simple metal.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 10 (1975), S. 113-122 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The microfracture patterns observed around point indentations in brittle solids are investigated. A description is first given of the stress field in an elastic half-space loaded normally at a point in its surface. This field is then used as a basis for analysing the crack geometry. A localized zone of irreversible deformation forms about the contact point, thereby removing a singularity in the elasticity solutions and providing nucleation centres for the ensuing microcracks. Generally, two main types of ‘vent’ cracks are observed to propagate from the deformation zone: median vents, formed during indenter loading, spread downward below the point of contact on planes of symmetry, and lateral vents, formed during unloading, spread sideways toward the specimen surface. Of these, the median vent is relatively well-behaved, and is amenable to standard fracture-mechanics analysis. From such an analysis we derive the means for predetermining, in principle, the depth of fracture damage under given point loading conditions. The significance of the results in relation to important practical applications, such as glass cutting and surface fragmentation processes, is discussed.
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  • 7
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An interaction of electrochemical ideas with the approaches of solid state physics provides some interesting analogies and themes in which certain aspects of electrolyte solutions, solid semiconductors and ionic liquids can be discussed in a somewhat inter-related manner. Some of the fundamental properties of this wide range of materials (solid semiconductors, molten salts or aqueous (electrolyte) solutions) may be unified into a loose theme derived from the general notions of the band theory of solids and its analogue in electrolyte solutions, namely, the electron and proton levels of electrolytes. The concepts which would describe the intermeshing behaviour of these materials will be derived from: the band theory of semi-conductors; Gurney's ideas on the occupied and vacant proton levels in electrolyte solutions; Rose's approach to the electron energy levels in solids and electrolytes; Fuller's views on the conceptual analogies between semiconductors and electrolyte solutions; interpretation of molten salts put forward by Bockris and co-workers; and, finally, the industrial applications of Gurney's ideas made by Vermilyea in his interpretations of the corrosion of aluminium in water and the effect of various inhibitors on this corrosion reaction.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 10 (1975), S. 165-167 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 10 (1975), S. 175-178 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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