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  • 1
    Electronic Resource
    Electronic Resource
    Etude de l'adsorption des ions metalliques a forte concentration et des impuretes par les resines
    Amsterdam : Elsevier
    Journal of Inorganic and Nuclear Chemistry 33 (1971), S. 3905-3942 
    Details
    ISSN: 0022-1902
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-1902(71)80299-3
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  • 2
    Electronic Resource
    Electronic Resource
    A numerical evaluator for the generalized hypergeometric series
    Amsterdam : Elsevier
    Computer Physics Communications 77 (1993), S. 249-254 
    Details
    ISSN: 0010-4655
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Computer Science , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0010-4655(93)90008-Z
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  • 3
    Electronic Resource
    Electronic Resource
    Temperature dependence of the mechanical properties of EPDM rubber-polyethylene blends filled with aluminium hydrate particles (1989)
    Springer
    Journal of materials science 24 (1989), S. 649-657 
    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 this second part of the study concerning the characterization of new flame-retardant materials, special attention has been paid to a ductile-brittle transition which occurs at about 70° C. In order to evidence the causes of this unexpected phenomenon of brittleness, all the tensile mechanical properties (tensile strength, strain at break and modulus of elasticity) of filled and unfilled EPDM-polyethylene blends are systematically studied in relation to thermal conditions. Examination of the fracture facies of broken samples, at different temperatures, clearly points out this transition. It is shown that the presence of a rubber phase within the matrix is solely responsible for this type of behaviour. The fracture energy of the blends, as a function of filler volume fraction and temperature, is also determined. Finally, a very simple test on folded samples, allowing a precise determination of the critical temperature at which the ductile-brittle transition occurs, is developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01107456
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  • 4
    Electronic Resource
    Electronic Resource
    On the estimation of the tensile strength of carbon fibres at short lengths (1989)
    Springer
    Journal of materials science 24 (1989), S. 3504-3510 
    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 Generally, to determine the fibre-matrix interfacial properties in fibre reinforced plastics, it is necessary to know the tensile strength of the fibre at very short lengths, for which direct measurements are not possible. Accordingly, in this study, the determination of the tensile strength of high strength carbon fibres and their gauge length dependence are analysed by means of the Weibull model. The influence of the estimator chosen and of the sample size on the calculated value of the tensile strength of the fibre are first determined. Secondly, the accuracy of the three- and the two-parameter Weibull distributions is examined. Finally, it is shown that the most appropriate extrapolation at short length is performed by means of a linear logarithmic dependence on gauge length of the tensile strength. This method seems to be valid for untreated as well as for surface-treated high strength carbon fibres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02385732
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  • 5
    Electronic Resource
    Electronic Resource
    Stress transfer in single-fibre composites: effect of adhesion, elastic modulus of fibre and matrix, and polymer chain mobility (1989)
    Springer
    Journal of materials science 24 (1989), S. 1835-1844 
    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 stress transfer in single-fibre composites is studied experimentally by determining the critical fibre length to diameter ratio,I c/d, in carbon fibre-epoxy resin or poly (ethylene vinyl acetate) systems. Our results and a great number of others available in the literature are compared with the predictions given, on the one hand, by the analytical approach by Cox and, on the other hand, by the theoretical study using finite element technique by Termonia. First, the influence of the fibre-matrix adhesion is analysed and it is observed, in agreement with Termonia, thatI c/d strongly decreases when the bonding efficiency between the two components is increased. Secondly, assuming a perfect fibre-matrix adhesion, it is shown that the critical fibre aspect ratio is proportional to the square root of the ratio of fibre to matrix elastic modulus, as predicted by Cox. However, two linear relationships are established: the first corresponds to the thermosetting and thermoplastic matrices, while the second corresponds to the elastomeric matrices. The difference between these two kinds of materials is attributed to the great difference in polymer chain mobility as shown by a study of the temperature dependence ofI c/d, particularly in the glass transition temperature zone of the matrices. However, in the case of elastomeric materials, the existence of an interphase layer between the fibre and the matrix, having an elastic modulus close to that of the elastomer in its glassy state, can also explain this particular behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01105713
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  • 6
    Electronic Resource
    Electronic Resource
    Mechanics of fibre fragmentation (1996)
    Springer
    Journal of materials science 31 (1996), S. 1707-1714 
    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 fragmentation specimen consists of a single fibre embedded along the axis of a long narrow resin block. When the fibre is broken by a tensile load, either a lateral crack runs outwards into the resin, initiated by the break, or a debond (or equivalently a cylindrical crack in the resin) propagates along the fibre. Debonding always occurs with thin fibres. Strain energy release rates have now been calculated, analytically for long debonds and by FEA for short ones. The force to propagate a debond is found to increase as the debond grows, reaching a final value, termed “pull-out force”, that is higher for softer fibres. If this force exceeds the strength of the fibre, then the fibre breaks again. This is the proposed mechanism of fibre fragmentation. For weakly-bonded, stiff fibres, the inferred minimum distance between breaks, i.e. the critical fragment length, is deduced to be of the order of the geometric mean of the radii of fibre and resin block, about 0.1–0.5 mm for typical fragmentation specimens, and it increases as the ratio of fibre stiffness to resin block stiffness increases, in agreement with observation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00372182
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  • 7
    Electronic Resource
    Electronic Resource
    Acoustic scan analysis of the morphological evolution of a vinylester resin near a surface (1997)
    Springer
    Journal of materials science 32 (1997), S. 5753-5759 
    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 acoustic analysis of the morphological evolution, from the surface to the bulk, of a vinylester resin cured in contact with two types of surfaces, i.e. aluminium and air, has been studied. The analysis was also performed as a function of styrene monomer content of the uncured resin. The existence of a thick layer, in which the vinylester network is deeply affected due to the relative variations of polystyrene and vinylester polymer from the interface to the bulk, was first demonstrated by microscopical Fourier transform–infrared spectroscopy. Secondly, this structural evolution was analysed by means of an acoustic scan technique, allowing the variations of the mechanical properties of the vinylester network to be estimated as a function of the distance from the interface. A good correlation was obtained between spectroscopic and acoustic results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018673918825
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of elastic moduli and interfacial adhesion energy on the critical fibre aspect ratio in single-fibre composites (1993)
    Springer
    Journal of materials science 12 (1993), S. 1245-1247 
    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/BF00506324
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  • 9
    Electronic Resource
    Electronic Resource
    Coupling of mica as filler in polypropylene (1988)
    Springer
    Journal of materials science 7 (1988), S. 955-957 
    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/BF00720740
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  • 10
    Electronic Resource
    Electronic Resource
    Study of the carbon fiber-Poly(Ether-Ether-Ketone) (PEEK) interfaces, 3: influence and properties of interphases (1991)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 2 (1991), S. 161-169 
    Details
    ISSN: 1042-7147
    Keywords: Crystalline interphase ; Interfacial polymer chain orientation ; Elastic modulus of interphase ; Stress-free temperature ; Reversible energy of adhesion ; 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
    Notes: The aim of this third part is to analyze the structure and properties of the interfacial region between carbon fibers and PEEK as a function of different thermal conditioning treatments. First, it is shown by means of optical microscopy that the interfacial zone is not different from the bulk matrix when standard cooling conditions are used. On the contrary, a transcrystalline interphase is formed near the carbon fiber surface in systems that have been subjected to isothermal treatments. By comparison with previous results concerning the mechanical properties of the fiber-matrix interface, it appears that the interfacial shear strength decreases in the presence of a transcrystalline interphase or when the crystallization rate of PEEK increases. Moreover, it seems that the “constraint state” of the amorphous phase of PEEK near the fiber surface could also play a role in the interfacial shear strength. Secondly, a method is proposed in order to estimate the elastic modulus of crystalline interphases. It seems that this modulus is strongly dependent on the crystallization rate of the polymer. Finally, the determination of the stress-free temperature, defined as the temperature at which a longitudinal compressive stress just appears on the carbon fiber during the processing of the composites, is performed by recording the acoustic events corresponding to the fragmentation process in single-fiber composites. The results confirm that the crystallization rate and the “constraint state” of the amorphous phase of the matrix play an important role in the mechanical behavior of carbon fiber-PEEK interfaces.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pat.1991.220020401
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