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  • 1980-1984  (10)
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  • 1
    Electronic Resource
    Electronic Resource
    TRANSPORT OF ALCOHOLS IN DEFORMED PMMA (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 371 (1981), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1981.tb55674.x
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  • 2
    Electronic Resource
    Electronic Resource
    Pencil slip in beta-tin single crystals (1980)
    Springer
    Journal of materials science 15 (1980), S. 2733-2742 
    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 Pencil slip was observed when a punch was pressed over the (0 0 1) surface of a β-tin single crystal. A bulge of similar size and shape as the punch appeared at the opposite surface directly across the thickness of the crystal. Slip line observations inside the sample showed slip activity confined to a cylindrical shell whose inner diameter was the same as the punch and whose axis was parallel to the [0 0 1] direction. The thickness of the slip shell increased with the punching stress and with the ratio between punch diameter and sample thickness. The effects of punching stress on the entering velocity of the punch and on the exiting velocity of the bulge were studied and the results compared with those of impression creep reported previously. The situation in which the bulge was not allowed to form was also studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00550540
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  • 3
    Electronic Resource
    Electronic Resource
    Fracture of shear bands in atactic polystyrene (1981)
    Springer
    Journal of materials science 16 (1981), S. 1858-1873 
    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 Thick shear bands in polystyrene formed by compression could cause fracture or the formation of cracks by intersecting with themselves, by relaxing after the removal of the load, by propagating all the way to the side surfaces and by subsequent tensile deformation. The microstructural mechanisms involved in all these fracture processes are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540634
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  • 4
    Electronic Resource
    Electronic Resource
    Morphology and annealing behaviour of thick shear bands in polystyrene (1980)
    Springer
    Journal of materials science 15 (1980), S. 1898-1906 
    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 Shear bands of 0.1 to 0.6 mm thick were produced in polystyrene by compression. These bands were studied by optical microscopy and surface profilometry. Both the as-deformed bands and the bands developed after annealing were investigated. Parameters such as the shear strain, step height and the height-to-base ratio of the band cross-section (ridges or valleys) were recorded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00550615
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  • 5
    Electronic Resource
    Electronic Resource
    Indentation recovery of atactic polystyrene (1980)
    Springer
    Journal of materials science 15 (1980), S. 1364-1370 
    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 Indentations made on the surface of atactic polystryene were annelaed for different lengths of time at various temperatures. The depths of these indentations were measured by using a modified Sloan surface profilometer. The variation of depth with time was found to follow second order kinetics at least for the later part of recovery. The activation energy associated with the second order rate constant was 163 kcal mol−1 which is comparable to the value of 160 kcal mol−1, measured in the same material for the recovery of coarse shear bands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00752115
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  • 6
    Electronic Resource
    Electronic Resource
    Recovery of compressive strain in atactic polystyrene (1981)
    Springer
    Journal of materials science 16 (1981), S. 889-899 
    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 Atactic polystyrene rods were compressed in an Instron universal testing machine to about 35% strain and then annealed near the glass transition temperature, T g, (100° C) in a thermal mechanical analyser. The change of length during annealing was recorded and the compressive strain was found to recover obeying second-order kinetics at least during the later part of recovery. The activation enthalpy obtained from the temperature dependence of the second-order rate constant varied from 126 to 260 kcal mol−1 as the annealing temperature decreased from 112 to 94° C. These activation enthalpies are attributed to the diffusion of positive or negative defects or configurations which annihilate during recovery. While these activation enthalpies agree with the findings of Andrews on retraction of hot-stretched filaments, they differ considerably from the spectrum obtained by Kimmel and Uhlmann using the data from Andrews' work. The reason for such differences is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00542732
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  • 7
    Electronic Resource
    Electronic Resource
    Reverse shearing of shear bands in polystyrene (1982)
    Springer
    Journal of materials science 17 (1982), S. 3445-3459 
    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 Shear bands produced in polystyrene by compression can be reverse sheared by a second compression in a perpendicular direction. The net shear strain can be zero or negative. Like the forward shear, the reverse shear also produces a ridge on the surface. The height of the ridge seems to be proportional to the reverse shear strain. On the side surface the reverse shear produces a step whose height increases at an average rate of 1.17 mm sec−1 (at a crosshead speed of 1 mm sec−1), estimated by high-speed cinematography at 1000 frames sec−1. During the reverse shear the second compression experiences a yield drop whose size increases with the forward strain due to the first compression. The implications of these results are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00752190
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  • 8
    Electronic Resource
    Electronic Resource
    Propagation of shear bands through obstacles in atactic polystyrene (1982)
    Springer
    Journal of materials science 17 (1982), S. 652-670 
    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 High speed cinematography (up to 6000 frames sec−1), as well as optical and electron microscopy, was used to study the formation and propagation of thin and thick shear bands in atactic polystyrene, with and without obstacles in their paths of propagation. Three different kinds of obstacles were studied, an existing thick band, a fully recovered thick band and a region dispersed with 2 to 6 μm rubber particles (a strip of high impact polystyrene). Except for the fully recovered thick band which behaved like undeformed polystyrene, the other two obstacles effectively reduced the speed of propagation of the shear band packets and changed their mode of operation by dispersing them into thin bands and spreading them out into larger spaces. However, the original localized mode of operation resumed after the shear band packet passed through the obstacles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540362
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  • 9
    Electronic Resource
    Electronic Resource
    Methanol crazing of coarse shear bands in polystyrene (1983)
    Springer
    Journal of materials science 18 (1983), S. 3047-3053 
    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 specimen with coarse shear bands produced at stress concentrations by compression was immersed in methanol to observe craze formation. Thin crazes were initiated at shear bands and joined together while propagating to form thick crazes. Crazes were formed only on the tension side of shear bands with the craze planes perpendicular to the shear bands. When a craze propagated through a shear band, each displaced the other at intersections. Some secondary shear bands were transformed partly into crazes resulting in about a factor of ten increase in thickness. This transformation was achieved by a tensile deformation of fibrous sheets in the shear band with simultaneous production of fine fibres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00700787
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  • 10
    Electronic Resource
    Electronic Resource
    Behavior and properties of shear bands (1984)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 24 (1984), S. 750-760 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Some recent observations on shear bands in polymers are reviewed. These include intrinsic properties such as the mechanism of formation, the intersection of shear bands, the rate of propagation with and without obstacles, recovery of shear strain by annealing, and the stored energy in shear bands. Mechanical responses include the shear yielding criteria, reverse shear behavior and the Bauschinger effect, and the fracture of and at shear bands. Environmental effects include methanol transport in shear bands and in deformed poly(methvl methacrylate) in the region of mixed Fickian and case II behavior and methanol crazing of a shear banded material.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760241005
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