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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 11 (1973), S. 223-232 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Craze initiation and propagation near a Griffith crack were studied in poly(methyl methacrylate) and polycarbonate. Craze propagation results either in eventual catastrophic failure or in termination of propagation. Photoelastic observations indicate that high stress concentration at the initial crack tip is relieved immediately after craze initiation and craze propagation introduces no new stress concentration at the craze front. These results lead to the conclusion that the criteria for craze initiation and propagation are described fairly well by the stress intensity factor. A fracture mechanics model proposed by Marshall et al. can explain the kinetics of craze propagation in poly(methyl methacrylate). However the growth rates are lower in polycarbonate than in poly(methyl methacrylate). This is attributed to the difference in a penetrant activity.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 11 (1973), S. 1235-1245 
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Creep failure in oriented nylon 6 fibers has been studied. The results suggest that the variations in the lifetime under various loading histories are inherent, but statistical, characteristics of the material itself. The treatment of experimental data by a stochastic theory shows that the creep failure can be regarded as a nucleation process. An interpretative analysis of the structural changes during creep indicates that the nucleation is brought about by bond rupture in the amorphous regions of the fiber structures.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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