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  • 1985-1989  (10)
Source
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Scaling of Precipitated Structure in Al-Zn Alloys (1987)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 13-14 (Jan. 1987), p. 57-68 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/59/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.13-14.57.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Tensile strength of fibre-reinforced metal matrix composites with non-uniform fibre spacing (1989)
    Springer
    Journal of materials science 24 (1989), S. 3536-3540 
    Details
    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 influence of non-uniform fibre spacing on the strength of unidirectional fibre-reinforced metal matrix composites was studied by means of a Monte-Carlo computer simulation experiment. The influence of yield stress of the matrix and scatter of the fibre strength on the strength of composites were also studied for both uniform and non-uniform fibre spacings. It was demonstrated that (1) the strength of composites with non-uniform fibre spacing is lower than that with uniform spacing due to the high stress concentration arising from the breakage of fibres, and (2) the reduction in strength of composites due to the non-uniformity increases with increasing scatter of fibre strength. For both cases of uniform and non-uniform spacings, the following tendencies were observed : (a) the strength of composites increases but then decreases with increasing yield stress of matrix, (b) it is very sensitive to yield stress of the matrix when the scatter of fibre strength is large but not when it is small, and (c) it decreases but then increases with increasing scatter of fibre strength when the yield stress of the matrix is high, while it decreases monotonically with increasing scatter of fibre strength when the yield stress is low.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02385736
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A study of multiple fracture phenomenon of a coating film on a metal fibre by means of computer simulation (1986)
    Springer
    Journal of materials science 21 (1986), S. 2735-2743 
    Details
    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 Multiple fracture phenomenon of coating film on ductile metal fibre was studied by means of a computer simulation technique. The simulation experiments were carried out for various combinations of mechanical factors such as strength of coating film. Young's and shear moduli of fibre and coating film, yield stress of fibre and strain hardening coefficient of fibre and geometrical factors such as diameter of fibre and thickness of coating film. The effects of these factors on the number of fractures of the coating film and length of segmented film as a function of applied tensile stress and elongation to failure of coated fibre were clarified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00551481
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Stress distribution in a segmented coating film on metal fibre under tensile loading (1986)
    Springer
    Journal of materials science 21 (1986), S. 2744-2752 
    Details
    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 When a coating film on a metal fibre or wire is brittle, it exhibits multiple-fracture under loading. In order to describe the exerted tensile stress on the segments of a coating film as a function of the distance from the end of the segments and as a function of applied stress, a new approximate calculation method is presented, assuming that the interfacial bonding strength is high enough and no interfacial debonding occurs. Using the present calculation method, effects of geometrical factors such as fibre diameter, thickness of coating film and length of segment as well as those of mechanical factors such as Young's modulus, shear modulus and the yield stress of the fibre and the coating film on the exerted tensile stress on the segments and also on the exerted shear stress at the interface are described in a quantitative manner.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00551482
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Grain size and its relation to tensile strength of Nb3Sn compound in bronze-processed multi-filamentary superconducting materials (1987)
    Springer
    Journal of materials science 22 (1987), S. 2163-2168 
    Details
    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 grain size and room-temperature tensile strength of Nb3Sn compound were studied over wide ranges of annealing temperature and time using thin and thick multi-filamentary superconducting composite materials. The strength of Nb3Sn compound in thick specimens was lower than that in thin specimens at any heat treatment. This result was accounted for by the existence of extra-coarse grains in thick specimens. It was found that the strength of Nb3Sn compound is nearly proportional to the inverse square root of the grain size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01132954
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Influences of interfacial bonding strength and scatter of fibre strength on tensile behaviour of unidirectional metal matrix composites (1988)
    Springer
    Journal of materials science 23 (1988), S. 886-893 
    Details
    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 influences of interfacial bonding strength and scatter of strength of fibres on tensile behaviour of unidirectional metal matrix composites, whose matrix has low yield stress in comparison to the strength of fibres, were studied using the Monte-Carlo simulation technique using two-dimensional model composites. The following results were found. The strength of composites increases with increasing bonding strength, especially when the bonding strength exceeds the shear yield stress of the matrix and then remains nearly constant. The strength of composites is very sensitive to bonding strength when the scatter of fibre strength is large, but not when it is small. The fracture mode varies from non-cumulative to cumulative with increasing scatter of fibre strength for both cases of weak and strong interfacial bondings. The fracture surface becomes irregular when bonding strength becomes low and scatter of fibre strength becomes large. The applicability of the Rosen and Zweben models and the rule of mixtures to predict the strength of composites was examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01153984
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Stress disturbance due to broken fibres in metal matrix composites with non-uniform fibre spacing (1989)
    Springer
    Journal of materials science 24 (1989), S. 3865-3872 
    Details
    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 Premature fracture of weaker fibres causes stress disturbances in composites. These disturbances are affected by non-uniformity of fibre spacing. In order to evaluate quantitatively how the disturbances in metal matrix composites are affected by the extent of non-uniformity of fibre spacing, a method of calculation is presented on the basis of two-dimensional shear lag analysis. Static tensile stress concentrations in the intact fibres to broken fibres, tensile stress distribution along the fibre axis in the broken and intact fibres and shear stresses between broken and intact fibres were calculated by the method presented, using some examples. It is shown quantitatively that the spacing between broken and intact fibres and that between intact and next fibres has a significant influence on tensile stress concentrations in intact fibres and also on the shear stresses between broken and intact fibres: the narrower the former spacing and the wider the latter spacing, the higher become both tensile and shear stress concentrations. This tendency is enhanced when the number of broken fibres is large and when the strain hardening of the matrix is high.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01168948
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Strength and elongation of multifilamentary Nb3Sn superconducting composite materials with small amounts of Nb3Sn compound (1987)
    Springer
    Journal of materials science 22 (1987), S. 2175-2180 
    Details
    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 In order to describe the tensile strength and elongation to failure of multifilamentary Nb3Sn superconducting composite materials with small amounts of Nb3Sn showing multiple fracture, approximate calculation methods are proposed. In the proposed calculation method, the concept of shear-lag analysis and the plastic instability approach for metallic composites are employed. The experimental results are fairly well described by the present calculation methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01132956
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Tensile strength and flux pinning force of superconducting Nb3Sn compound as a function of grain size (1986)
    Springer
    Journal of materials science 21 (1986), S. 1020-1026 
    Details
    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 In order to evaluate the influence of grain size on the strength and flux pinning force of the Nb3Sn compound, the microstructure, tensile behaviour and flux pinning force of the bronze-processed Nb3Sn superconducting composite materials were investigated under various heat treatments. It was found that the strength of the Nb3Sn layer has a strong dependency on the grain size and it can be expressed by the Hall-Petch type relation. The flux pinning force was roughly proportional to the inverse grain size, agreeing with the results of former investigations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01117389
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Room-temperature tensile behaviour of bronze-processed multi-filamentary Nb3Sn superconducting materials (1986)
    Springer
    Journal of materials science 21 (1986), S. 1027-1036 
    Details
    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 Structure and its relation to fracture behaviour of multi-filamentary Nb3Sn superconducting composite materials prepared by the bronze method were studied by tensile testing at room temperature. There were two types of fracture mode. Type I showed high elongation, accompanied by apparent plastic deformation of composites as a whole and the Nb3Sn layer exhibited multiple fracture. Type II showed no apparent plastic deformation and the composites fractured in a brittle manner. Type I occurred when the fraction of the Nb3Sn layer was small and the drop of load-bearing capacity due to fracture of Nb3Sn layer could be compensated mainly by strain hardening of ductile constituents of Nb, Cu-Sn and Cu. On the other hand, Type II occurred when the fraction of Nb3Sn layer was large and the fracture of the Nb3Sn layer caused fracture of composites as a whole. To describe the tensile strength of composites for both types, a model was proposed, which explained well the experimental results. It was found that the strength of the Nb3Sn layer decreases with increasing diameter of composites and with increasing annealing temperature and time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01117390
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    Paper (German National Licenses)
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