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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 254-255 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A NALYSIS of the strength of materials, from an /~\ atomistic point of view, predicts that the ratio, a, of fracture stress (a) to initial strain (e) in atomic bonds will be of the order of 10 per cent E (E = Young's modulus). A value of a of this magnitude should be obtainable for perfect ...
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  • 2
    ISSN: 1572-9435
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 197 (1963), S. 587-587 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A stack of three compacts was mounted under a bell jar in an arc image furnace2 and the uppermost one heated, in an atmosphere of high-purity nitrogen. The initial nitrogen pressure was 745 mm and the pressure at the end of the heating period was 750 mm. The following sequence of events was ...
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 104 (1920), S. 662-662 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MAY I beg the hospitality of your columns for two announcements? First, the Sociological Society is moving from the London School of Economics and Political Science to a house of its own at 65 Belgrave Road, Westminster, S.W.1. The society hopes to get installed there by the beginning of ...
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 326 (1987), S. 481-483 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] During recent years much work has been directed towards elucidating the mechanisms causing and controlling atmospheric acidity. The chemistry of acid formation in the troposphere is complex involving both primary pollutants (NO, SO2) and secondary pollutants (NO2, HNO3 and H2SO4) in an intricate ...
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 23 (1988), S. 1817-1824 
    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 hot-pressing behaviour and fracture of silicon nitride as a function of composition was investigated. Two compositions were studied: 95 wt% Si3 N4 + 5 wt% MgO, Material A, and 88 wt% Si3N4 + 2wt% MgO + 10wt% Y2O3, Material B. The effect of composition, hot-pressing time and temperature on the properties of the product were examined. The room-temperature fracture strengths of the two materials were evaluated using the diametral-compression disc test.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 28 (1993), S. 3322-3328 
    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 Extensive cracking of the type known as stack cracking was demonstrated in a cathodically charged X65 microalloyed pipeline steel containing a weldment. It is shown that the formation and propagation of rolling-plane cracks, which constitute the primary stages of the stack cracking, is due to local concentration of hydrogen gas pressure and a lowering of the cohesive strength of a number of interfaces by hydrogen. The characteristic S-shape of individual cracks which occurred during the linking up of cracks was attributed to stress interactions at crack tips and cleavage cracking normal to the rolling plane. An explanation of hydrogen embrittlement fracture is given in terms of electronic state modifications of the steel, including charge polarization.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 19 (2000), S. 2007-2010 
    ISSN: 1573-4811
    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 28 (1993), S. 847-852 
    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 planar defects associated with deformation in ordered intermetallic compounds namely, the antiphase boundary, superlattice intrinsic stacking fault, and complex stacking fault are non-equilibrium structures corresponding to a state of disorder within the ordered structure of the lattice and therefore affect both the electronic energy states and the Brillouin zone structure. It is possible that a relationship exists between the antiphase boundary energy, γAPB, and the sum of the number of unfilled outermost d-state electrons in the transition metals on which this class of intermetallics is based. If this hypothesis is taken in conjunction with a set of rules for improving ductility in intermetallics proposed previously, a coherent explanation of recently observed ductilities in transition metal-based intermetallics would seem to be feasible.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 18 (1983), S. 3128-3136 
    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 hydrogen embrittlement of a hardened and tempered plain carbon, eutectoid steel of 1930 MN m−2 tensile strength has been studied. Plain, unnotched specimens were electrolytically charged with hydrogen and then subjected to tensile tests and delayed failure tests at constant load. The test results showed a scatter characteristic of a stochastic process and it is shown that the distribution can be described by a modified form of the Weibull probability function. Fractographic results are reported which show that fracture initiated internally at oxide inclusions and it is suggested that the embrittlement can be explained by a pressure mechanism.
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