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  • Articles  (39)
  • 1990-1994  (39)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (39)
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  • Articles  (39)
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  • 1
    Electronic Resource
    Electronic Resource
    DEPENDENCE OF ACOUSTIC EMISSION FOR LOW STRENGTH STEELS UPON THE EMBRITTLEMENT AND THE PLASTIC ZONE REDUCTION AT THE CRACK TIP DURING CORROSION FATIGUE CRACK PROPAGATION (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Fatigue & fracture of engineering materials & structures 16 (1993), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Acoustic emission signals were continuously monitored during fatigue crack propogation for two kinds of low strength steel placed in either laboratory air or 3.5% NaCl solution. The plastic deformation of the materials at the crack tips were compared by determining the changes in specimen geometry at the fracture surface in the thickness direction while the hydrogen distribution from the crack tip material was analysed by SIMS. The results showed that acoustic emission was less active in an aqueous solution than in air and that the plastic zone size was reduced in a corrosive medium. It was considered that the entrance of hydrogen into the crack tip during corrosion fatigue results in a decrease of material ductility, which lead to a low activity in acoustic emission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.1993.tb00099.x
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  • 2
    Electronic Resource
    Electronic Resource
    Modulated photoreflectance characterization of ion-implanted semiconductor wafers (1994)
    Springer
    Applied physics 58 (1994), S. 441-445 
    Details
    ISSN: 1432-0630
    Keywords: 78.50.−w ; 71.55.−i ; 78.65.−s
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Modulated PhotoReflectance (MPR) measurements on semiconductor wafers implanted with boron or silicon ions in the dose range 5×1010–5×1015 ions/cm2 are presented. Correspondingly, a one-dimensional theoretical multilayer model is established. In the theory, as the implant dose is lower than a critical value, the variation of the MPR signal is contributed mainly by the implanted defects and damages. However, when the dose is above the critical dose, the change of the MPR signal is chiefly due to the formation and growth of an amorphous layer. The theoretical results are in good agreement with those of experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332434
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental study of a wall shear stress sensor based on a porous element (1993)
    Springer
    Experiments in fluids 14 (1993), S. 153-157 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The paper presents a new type of local wall shear stress sensor made of a high-porosity material with filter grade 40 μn. The pressure variation caused by the shear stress acting on the surface can be transferred in this porous material, while the effect of the momentum change of the fluid is eliminated. Having neither protrusions nor cavities on the wall surface, the sensor presents little disturbance of the measured boundary layer. A pressure difference reading of the sensor is directly proportional to the local wall shear stress τ and the wall shear stress can be written as τ = C Δ P. The present investigation also deals with problems of sensor design and its influence on the performance of the sensor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00189504
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  • 4
    Electronic Resource
    Electronic Resource
    Interface and grain boundary structures in YBa2Cu3O7-x and YBa2Cu4O8 materials (1994)
    Springer
    Interface science 1 (1994), S. 321-337 
    Details
    ISSN: 1573-2746
    Keywords: Y2BaCuO5-YBa2Cu3O7-x interface ; point defeets ; flux pinning ; cation nonstoichiometry ; grain boundary chemistry ; oxygen deficiency ; hole density ; grain boundary misorientation ; high-resolution transmission electron microscopy (HRTEM) ; energy dispersive X-ray spectroscopy (EDS) ; electron energy-loss spectroscopy (EELS)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Y2BaCuO5YBa2Cu3O7-x (Y211/Y123) interfaces in melt-processed YBa2Cu3O7-x were studied by high-resolution transmission electron microscopy and energy dispersive X-ray spectroscopy. Yttrium enrichment and barium depletion were observed locally at the Y211/Y123 interfaces where Y123 (001) facets were present. This effect may be interpreted as the result of lattice substitution of Ba by Y near these interfaces. Cation nonstoichiometry was found near Y211/Y123 interfaces where liquid phases (Cu-Ba-O) were present. This chemical disorder introduces numerous point defects in the Y123, and these defects may act as additional pinning sites alongwith stacking faults. A comparison of grain boundary (GB) chemical composition in polycrystalline YBa2Cu3O7-x and YBa2Cu4O8(Y124), studied using nanoprobe parallel-detection electron energy-loss spectroscopy (EELS), is presented. The studies of Y124 show that stoichiometric grain boundaries can also form weak links between superconducting grains. It is suggested that weak-link behavior is determined largely by misorientation at grain boundaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00188702
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  • 5
    Electronic Resource
    Electronic Resource
    Mechanical behaviour of a cross-weave ceramic matrix composite (1991)
    Springer
    Journal of materials science 26 (1991), S. 4751-4758 
    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 deformation and fracture processes of a cross-weave carbon fibre/SiC composite prepared by a chemical vapour deposition process has been explored by interrupted-loading tests and SEM examination of cracking and fracture processes. The tensile stress-strain curves show non-linear behaviour associated with progressive matrix cracking and spalling, and the occasional fracture of a fibre. Re-loading curves and compressive stress-strain curves show linear behaviour. The fracture process does not involve cracking by a single dominant crack but occurs by the development of multiple damage sites operating around the transverse fractures of groups of four to eight fibres followed by longitudinal cracking at their fibre-matrix interfaces and temporary arrest of the cracks, until specimen failure occurs and there is massive fibre debonding and pull-out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00612414
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  • 6
    Electronic Resource
    Electronic Resource
    Strength degradation of SiC-coated carbon fibres (1993)
    Springer
    Journal of materials science 12 (1993), S. 817-818 
    Details
    ISSN: 1573-4811
    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
    URL: http://dx.doi.org/10.1007/BF00277983
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of bulge-forming procedures on cavitation of Zn-4Al-1Cu (1994)
    Springer
    Journal of materials science 13 (1994), S. 1733-1736 
    Details
    ISSN: 1573-4811
    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
    URL: http://dx.doi.org/10.1007/BF00776340
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetic properties of Sm2Fe14−xCoxAl3 compounds (1994)
    Springer
    Journal of materials science 29 (1994), S. 5333-5336 
    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 Compounds in the series Sm2Fe14−x Co x Al3 (x = 0, 1,2, 3, 4 and 5) have been shown to be of the Th2Zn17 structure. The Curie temperature is found to increase monotonically from a critical temperature,T c equal to 471 K for thex=0 sample, toT c=681 K for thex=5 sample. X-ray diffraction measurements of magnetic field oriented powders showed that all compounds exhibit a room temperature uniaxial anisotropy. Magnetization measurements show that the magnetic anisotropy of Sm2Fe14Al3 can be increased substantially by the substitution of even a small quantity of Co for Fe. Results are discussed in terms of possible applications of these compounds as particulate recording media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01171544
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  • 9
    Electronic Resource
    Electronic Resource
    The mechanical behaviour of a cross-weave ceramic matrix composite (1991)
    Springer
    Journal of materials science 26 (1991), S. 5335-5341 
    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 find out whether or not a cross-weave ceramic composite, graphite fibre/SiC matrix, would be prone to fatigue failure, tests in pulsating tension and pulsating compression have been carried out with the weave oriented in the 0/90 configuration. Both types of testing (at fairly high fractions of the ultimate monotonic failure load) cause creep strain, which is frequency dependent in tension, and ultimately complete failure can occur. Damage in pulsating tension is found to consist of cumulative microcracking and spalling, with the final failure mechanism broadly similar to that in monotonic deformation. Damage in pulsating compression appears dominated by delamination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01143230
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  • 10
    Electronic Resource
    Electronic Resource
    High-temperature creep of yttrium-aluminium garnet single crystals (1994)
    Springer
    Journal of materials science 29 (1994), S. 6458-6462 
    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 High-temperature creep in single crystals of Y3Al5O12 (YAG) was studied by constant strainrate compression tests. The creep resistance of YAG is very high: a stress of ~ 300 MPa is needed to deform at a strain rate of 10−6 (s−1) at a temperature as high as 1900 K (~0.84 T m, (melting temperature)). YAG deforms using the 〈111〉 {1¯10} slip systems following a power law with stress exponent n ~ 3 and activation energy E* ~ 720 kJ mol−1. However, a small dependence of n on temperature and of E* on stress was observed. This stress-dependence of activation energy combined with the observed dislocation microstructures suggests that the high creep resistance of YAG is due to the difficulty of dislocation glide as opposed to the difficulty of climb. Present dislocation creep data are compared with diffusion creep data and a deformation mechanism map is constructed. Large transition stresses (2−3 GPa for 10 μm grain size) are predicted, implying that deformation of most fine-grained YAG will occur by diffusion creep.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00354004
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