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  • 1985-1989  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    A new type of fatigue striation on PMMA immersed in organic agents (1985)
    Springer
    Journal of materials science 20 (1985), S. 3400-3408 
    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 growth tests of PMMA were undertaken at 295 K in organic agents with relatively high viscosity. Regular wavy striations, the wave length and amplitude of which were dependent on the characteristics of the agent, appeared on the fracture surfaces at low values of the stress intensity factor ranges. This type of striation has not been reported elsewhere. The formation mechanism of these was analysed based on the two dimensional viscous-fluid flow through a narrow gap between the crack planes. The theoretical suggestion that the wave length of the striation tends to increase with increase in the surface tension of the liquid and a decrease in its viscosity was in good agreement with the experimental trend.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00545209
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Crack growth under static and cyclic loading in hot-stretched PMMA (1985)
    Springer
    Journal of materials science 20 (1985), S. 1945-1952 
    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 growth behaviour under static and cyclic loading was investigated using anisotropic plates of PMMA oriented by hot-stretching. Both tests were performed at room temperature for samples with different degrees of orthotropy. A slight increase in the degree of orthotropy considerably improves the resistance to both static and cyclic crack growth in the case where the crack propagates perpendicularly to the hot-stretched direction. A power law relationship between crack growth rate and stress intensity factor may hold for both types of crack growth in the ranges of orthotropy tested. The experimental data for static crack growth were compared with a viscoelastic criterion based on the crack opening displacement theory for fracture. The criterion discussed here explains comparatively not only the beginning of cracking from a pre-introduced crack, but also the crack growth rate in oriented PMMA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01112276
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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