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  • 1
    Electronic Resource
    Electronic Resource
    Influence of analysis conditions on low pressure adsorption measurements and its consequences in characterization of energetic and structural heterogeneity of microporous carbons (1997)
    Springer
    Adsorption 3 (1997), S. 277-282 
    Details
    ISSN: 1572-8757
    Keywords: surface heterogeneity ; nitrogen adsorption ; micropore analysis ; microporous carbon ; low pressure adsorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Nitrogen adsorption isotherms on nonporous and microporous carbons were thoroughly studied at low relative pressures. For nonporous carbons low pressure measurements seem to be unaffected by analysis conditions. However, these measurements on microporous solids may be affected by analysis conditions at relative pressures below 10−4. It was shown that selection of proper equilibration time is crucial for correct measurements of equilibrium pressures during adsorption on microporous carbons. The isotherm shift induced by insufficient equilibration of the system may affect the surface heterogeneity and microporosity analysis. A comparison of the adsorption energy and pore volume distribution functions calculated from low pressure nitrogen adsorption isotherms measured at different equilibration times on a microporous carbon shows that this effect is smaller than it was expected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01653630
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  • 2
    Electronic Resource
    Electronic Resource
    Hybrid ceramic matrix composites (1988)
    Springer
    Journal of materials science 23 (1988), S. 3711-3720 
    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 A model hybrid glass-matrix composite has been studied. The system investigated was Corning Code 1723 glass matrix (an alkaline earth aluminosilicate glass) with silicon carbide whiskers and Nicalon® fibres. It was found that a 10 wt % whisker loading of the matrix gave optimum composite properties. The optimized hybrid composite, when compared to an optimized non-hybrid composite, showed increases in microcrack yield stress from 330 to 650 MPa, interlaminar shear strength from 47 to 130 MPa, and transverse strength from 12 to 50 MPa, while the ultimate strength decreased from 965 to 900 MPa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540519
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  • 3
    Electronic Resource
    Electronic Resource
    Whisker reinforcement of glass-ceramics (1991)
    Springer
    Journal of materials science 26 (1991), S. 4845-4854 
    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 Silicon carbide whisker reinforcement of anorthite and cordierite glass ceramics has been studied. At 25 vol% whisker loading the flexural strengths increased from 65–103 MPa to 380–410 MPa, the fracture toughnesses increased from 1.0–1.5 MPa m1/2 to 5.2–5.5 MPa m1/2. The strengths decline to 240–276 MPa at 1200 °C. The reasons for the decrease in strength with temperature are discussed. Whiskers from two different sources with differences in diameters and aspect ratios were evaluated and the effect of the whisker morphology on the composite properties was studied. It was found that larger diameter, higher aspect ratio whiskers result in improved composite performance. The composites were also characterized in terms of their thermal properties, i.e. thermal expansions and thermal conductivities. The thermal expansion coefficient from 25–1000 °C for anorthite-based composite was 4.6×10−6 °C−1 and that for the cordierite-based composite was 3.62×10−6 °C−1. The thermal conductivities at 1000 °C were 3.75 and 4.1 Wm−1 K−1 for cordierite and anorthite composites, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00549859
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  • 4
    Electronic Resource
    Electronic Resource
    Glass-ceramic matrix composites with high oxidation embrittlement resistance (1994)
    Springer
    Journal of materials science 29 (1994), S. 2417-2424 
    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 A new concept is introduced to minimize the oxidation embrittlement problem exhibited by Nicalon fibre-reinforced glass-ceramic matrix composites. A small amount of glass is added to the matrix and deforms at temperatures of interest to prevent microcrack formation. The graphitic interphase is thus shielded from an oxidative environment. The composites fabricated with the glass-doped matrices show excellent room- and elevated-temperature strengths and withstand high stresses at elevated temperatures in air for greater than 100 h without any deterioration in properties. The modulus of the glass-ceramic phase, the stiffness percentage of dopant glass and the process temperature were found to affect composite properties significantly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00363435
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  • 5
    Electronic Resource
    Electronic Resource
    Particulate-fibre-reinforced glass matrix hybrid composites (1992)
    Springer
    Journal of materials science 27 (1992), S. 3827-3834 
    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 This study extends the concept of hybridization of glass matrix composites to fibre and particulate reinforcements. Hybridization of Nicalon®-glass matrix composites with silicon carbide particulates of mean diameters of 0.77, 1.5 and 6 μm was studied. The microcrack stress, transverse strength and interlaminar strengths improved significantly on hybridization. At the optimum loading of 7.5 wt % for 6 μm particle size the microcrack stress increased by 62%, transverse strength by 650% and interlaminar shear strength by 200%. The ultimate strength declined for this composite by 6%. The decline in ultimate properties was attributed to the damaged graphitic skin at the particle-fibre contact points.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00545465
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Fatigue crack propagation in composites with spherical fillers-II effect of the size of the filler (1984)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 5 (1984), S. 231-237 
    Details
    ISSN: 0272-8397
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A study of the effect of spherical glass beads of mean diameters of 46 microns, 89 microns, and 133 microns, on fatigue crack propagation rates, was carried out at ten and thirty weight-percent beads. The resin was a low-molecular-weight [Mn = 8200, (MwMn) = 2.04] Bisphenol A-terephthalate/isophthalate thermoplastic copolyester. Fatigue crack-grwoth rates were measured using compliance method. The relationship between logarithm of stress intensity factor change and logarithm of crack-growth rate is linear for 46 micron beads. For the 89 micron beads, the relationship is still approximately linear. The incorporation of 133 micron beads, however, results in large fluctuations in crack-growth rates with changes in stress intensity factor range. A mechanism is proposed to explain this behavior. A relationship between interparticle distance and fatigue crack-growth resistance is also observed.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pc.750050312
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Prediction and measurement of fatigue of lifetime distributions for elastomeric biomaterials (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 3041-3055 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Synthetic polymer biomaterials being considered for cardiovascular applications must perform under conditions of large cyclic deformations for long lifetimes. In designing with these materials and eventually qualifying them clinically, it would be extremely helpful to be able to predict the fatigue lifetimes accurately and reliably. In this article a calculational format is presented which predicts the lifetime distribution function for elastomeric sheets undergoing tension-tension fatigue. From a knowledge of the intrinsic tensile strength distribution and the effect of an “equivalent” edge flaw size on the tensile strength, the inherent flaw size distribution is determined. A tearing energy concept is utilized to determine the flaw growth law constants. Each of these three short-term tests provides a pair of constants which, taken together, permit calculation of the fatigue lifetime distribution. When compared using Kolmogoroff statistics, experimental tensile-tensile fatigue results at 0.01 cps agreed well with the theoretically predicted lifetime distribution function.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070291009
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