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  • 1985-1989  (12)
  • 1975-1979  (27)
  • 1970-1974  (8)
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  • 1
    Electronic Resource
    Electronic Resource
    Isomeric Graft Copolymers and Interpenetrating Polymer Networks. Theory and Experiment (1976)
    s.l. : American Chemical Society
    Macromolecules 9 (1976), S. 743-749 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma60053a011
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  • 2
    Electronic Resource
    Electronic Resource
    Simultaneous Interpenetrating Networks Based on Castor Oil Elastomers and Polystyrene. 2. Synthesis and Systems Characteristics (1979)
    s.l. : American Chemical Society
    Macromolecules 12 (1979), S. 360-369 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma60069a002
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  • 3
    Electronic Resource
    Electronic Resource
    Fatigue crack propagation in crystalline polymers: effect of moisture in nylon 66 (1979)
    Springer
    Journal of materials science 14 (1979), S. 2482-2492 
    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 As part of a study of the effects of crystallinity on fatigue crack propagation (FCP) behaviour in crystalline polymers, the FCP response of nylon 66 was examined as a function of both stress intensity factor range (ΔK) and water content. It was found that FCP rates were exponential functions of ΔK, as expected. However, the FCP rates at constant ΔK decreased as the water content was increased to about 3%; at saturation (8% water), the FCP rates were higher than that observed in dry specimens. Results were interpreted in terms of the incorporation of tightly bound water up to a maximum of one water molecule per two amide groups (at∼ 2% water), followed by the incorporation of loosely bound water (at saturation). The tightly bound water evidently toughens the polymer, while the loosely bound water has a predominantly weakening effect. Examination of fracture surfaces revealed a transition from terminal unstable crack growth (at water contents up to 3%) to tearing (at saturation). Classical fatigue striations were observed only in the specimens containing 2% water—the first time such striations have been unequivocally identified for any crystalline polymer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00737039
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of rubbery phase and absorbed water on impact-modified nylon 66 (1986)
    Springer
    Journal of materials science 21 (1986), S. 39-45 
    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 fracture surface micromorphology of noon 66 and its blends was examined. A patchy appearance, found at low ΔK values when levels of imbibed moisture and impact modifier are low, is believed to result from a void coalescence mechanism. At higher water contents and levels of impact-modification, the fracture surface assumes a rumpled appearance with numerous secondary fissures oriented normal to the crack direction; the inter-rumple spacings, however, do not correspond to the macroscopic growth rate, A model to explain rumple formation is presented. The fatigue fracture surface appearance of unmodified nylon 66 is found to depend on both moisture content and test temperature. Trans-spherulitic fracture is found when the test temperature is below the glass transition temperatureT g (measured at 110 Hz) for a given water content, while at higher test temperatures a high degree of drawing is evident. It is concluded that the fracture surface micromorphology of nylon 66 and its blends depend strongly on the viscoelastic state of the polymer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01144696
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  • 5
    Electronic Resource
    Electronic Resource
    Crack tip heating in short-fibre composites under fatigue loading conditions (1987)
    Springer
    Journal of materials science 22 (1987), S. 3576-3580 
    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 Crack tip heating in cyclically loaded short-fibre polymer matrix composites occurs by a combination of hysteretic heating and frictional heating. While the former mechanism is caused by plastic and viscoelastic deformations within the polymeric matrix, the latter is due to interfacial friction between matrix and fibres, and crack surface interference associated with crack closure. The relative contribution of these two principal mechanisms depends upon a number of variables including the viscoelastic and plastic characteristics and frictional properties of the matrix polymer, the degree of interfacial adhesion, the fibre content and fibre orientation distribution and the loading conditions. The results confirm that even in a tension/tension loading mode, frictional heating may play a dominant role, at least in some systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01161462
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  • 6
    Electronic Resource
    Electronic Resource
    Mechanisms of fatigue fracture in short glass fibre-reinforced polymers (1987)
    Springer
    Journal of materials science 22 (1987), S. 4015-4030 
    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 Fatigue-crack profiles and fracture surfaces of several short glass fibre-reinforced polymers were examined to gain insight into the mechanisms of cyclic damage and fatigue-crack propagation in these materials. Several distinctly different features were noted between fracture surfaces generated by stable fatigue crack growth and those produced by monotonic or unstable fracture. Among the most significant differences were the higher degree of single and multiple fibre fracture generally observed on stable fatigue-crack growth fracture surfaces, and the variations in the interfacial failure site in well-bonded systems. While the former effect is attributed to the occurrence of crack closure and the build-up of compressive stresses in the crack-tip damage zone during unloading, the differences in the interfacial failure mode are related to the adverse effect of fatigue loading on the interfacial bond strength. No features could be identified that would allow a quantitative correlation between the applied stress intensity factor level or the crack growth rates and characteristic fracture surface details.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01133353
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  • 7
    Electronic Resource
    Electronic Resource
    Fatigue crack propagation in polyacetal (1978)
    Springer
    Journal of materials science 13 (1978), S. 1038-1044 
    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 fatigue crack propagation characteristics of a typical commercial homopolymer and copolymer polyacetal were determined. These materials were found to be the most fatigue resistant plastics examined to date, thus confirming the generally high fatigue resistance of all crystalline polymers. A discontinuous fatigue cracking process was identified at all test frequencies in the acetal copolymer and at high frequencies in the homopolymer, while continuous crack propagation occurred at low test frequencies in the homopolymer. The discrete advance increments of the crack in the discontinuous mode were equal to the dimension of the prevailing crack-tip plastic zone. On a more local scale, the crack path is seen to be mainly trans-spherulitic in nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00544699
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of rubbery phase and absorbed water on impact-modified nylon 66 (1986)
    Springer
    Journal of materials science 21 (1986), S. 31-38 
    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 fatigue crack propagation (FCP) response of impact-modified nylon was investigated as a function of rubbery second phase content and absorbed water level. Particular attention was given to the influence of these material variables on the amount of hysteretic heating as measured With an infrared microscope. FCP resistance was raised when heating was localized near the crack tip, but lowered by more generalized specimen heating. Variations in FCP behaviour were found to depend strongly on changes in the dynamic storage and loss moduli resulting from hysteretic heating, with the heating-induced modulus changes being more important than the absolute temperature increase of the sample. The combination of rubbery phase end absorbed water produced greater specimen heating and, in general, produced poorer FCP resistance than with the presence of either factor ahne.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01144695
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  • 9
    Electronic Resource
    Electronic Resource
    Electron microprobe investigation into the diffusion of ions through polymers (1970)
    Springer
    Journal of materials science 5 (1970), S. 898-900 
    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 objective of this investigation is to study the mechanism of ion diffusion through polymeric films and coatings. A better understanding of this phenomenon should aid progress with problems such as corrosion protection and desalination membranes. The authors wish to report some preliminary results obtained by means of electron microprobe analysis. Salt diffusion through polymeric materials have been studied by several methods, e.g. chemical analysis [1], radioactive tracer techniques [2], and neutron activation analysis [3]. Although such methods yield useful information about average diffusion parameters, they provide no insight into details of diffusion on a localised and microscopic scale. The electron microprobe, on the other hand, can be used to determine the presence of specific ions in a volume element as small as 1μm in diameter. Therefore, microprobe analysis should be useful in determining local concentrations of diffusing ions and in examining the details of the diffusion process in polymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00574862
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  • 10
    Electronic Resource
    Electronic Resource
    Fatigue crack propagation in polymeric materials (1970)
    Springer
    Journal of materials science 5 (1970), S. 521-526 
    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 gain a better understanding of matrix-controlled fatigue failure processes in non-metallic materials a series of fatigue tests were performed on several different polymer materials representing different classes of mechanical response. Fatigue crack propagation rates between 5×10−6 in. cycle−1 (127 nm cycle−1) and 4×10−4 in. cycle−1 (10 300 nm cycle−1) were measured in nylon, polycarbonate, ABS resin, low-density polyethylene and polymethyl methacrylate. A strong correlation was found between the fatigue crack propagation rate and the stress intensity factor range prevailing at the advancing crack tip. Whereas metals exhibit comparable fatigue growth rates for a given stress intensity range when normalised with respect to their static elastic modulus, the polymer materials exhibited a 1300-fold difference in crack growth rate for a given normalised stress intensity range. This observation dramatically illustrates the importance of understanding molecular motion and energy dissipation processes in polymer materials as related to their chemistry and architecture. The relative behaviour of the different polymer materials could be generally correlated with their reported damping characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00556040
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