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  • 1985-1989  (5)
Source
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Predicting failure from the initiation stage of slow crack growth in polyethylene (1986)
    Springer
    Journal of materials science 21 (1986), S. 4081-4088 
    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 crack opening displacement against time was measured in linear polyethylene as a function of stress, notch depth, and temperature for three-point bending under plane strain conditions. The experimental conditions were accurately controlled so that the scatter in the rate of damage was within ±20%. Microscopic observations showed that the shape of the damaged zone was triangular for stresses less than one-half the yield point and that the length was predictable from measurements of the crack opening displacement. The initial rate of damage prior to crack growth was constant up to crack opening displacement = 15 to 25Μm. The entire shape of the crack opening displacement-time curve and the time to complete failure could be predicted from the initial damage rate. A theory based on the observed microcrazing is presented which explains the dependence of damage rate on stress intensity and microstructural parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553472
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The relationship of the initiation stage to the rate of slow crack growth in linear polyethylene (1986)
    Springer
    Journal of materials science 21 (1986), S. 2423-2429 
    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 rate of notch opening was observed in single-edge notched tension specimens of linear high-density polyethylene under plane strain conditions as a function of applied stress and notch depth. The initial rate of notch opening was 22K 4.3 μm min−1 (where units ofK are MN m−3/2). The initial rate of notch opening was constant until the opening at its root was 25 to 30μm for all stresses and notch depths. The accelerating part of the notch opening against time curve and the time to failure could be predicted from the initial rate of notch opening. It is concluded that the same mechanism governs the initiation stage and the subsequent crack growth rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01114287
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Investigating the existence of a threshold stress intensity for slow crack growth in high-density polyethylene (1989)
    Springer
    Journal of materials science 24 (1989), S. 2467-2472 
    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 existence of a threshold stress intensity for failure by slow crack growth under plane strain conditions for single-edge notched tensile specimens and for three-point bending was investigated at 42° C. It was found that the threshold for the nucleation of damage was between 0.074 and 0.063 MPa m1/2 and the threshold for complete failure was about 0.08 MPam1/2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01174513
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Slow fracture in a homopolymer and copolymer of polyethylene (1988)
    Springer
    Journal of materials science 23 (1988), S. 643-648 
    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 slow crack-growth behaviours of a high-density polyethylene and an ethylene-hexene copolymer with 4.5 butyl chains per 1000 carbon atoms are compared. The slow crack-growth rate in the copolymer is about 102 to 103 times slower than for the homopolymer. The two polymers are compared with respect to their kinetics of slow crack growth, the morphology of the damage zone that grows from a notch, the stress-strain behaviour and the temperature dependence of the rate of damage. The results suggest that the major effect of the butyl branches is to decrease the rate of disentanglement which governs the process of slow crack growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01174699
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Predicting failure from the initiation stage of slow crack growth in polyethylene (1986)
    Springer
    Journal of materials science 21 (1986), S. 4081-4088 
    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 crack opening displacement against time was measured in linear polyethylene as a function of stress, notch depth, and temperature for three-point bending under plane strain conditions. The experimental conditions were accurately controlled so that the scatter in the rate of damage was within ±20%. Microscopic observations showed that the shape of the damaged zone was triangular for stresses less than one-half the yield point and that the length was predictable from measurements of the crack opening displacement. The initial rate of damage prior to crack growth was constant up to crack opening displacement = 15 to 25Μm. The entire shape of the crack opening displacement-time curve and the time to complete failure could be predicted from the initial damage rate. A theory based on the observed microcrazing is presented which explains the dependence of damage rate on stress intensity and microstructural parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02431655
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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