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  • 1
    Electronic Resource
    Electronic Resource
    Origin of a magnetic easy axis in pipeline steel (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 1574-1580 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Oil and gas pipelines are generally magnetically anisotropic, with a magnetic easy axis in the pipe axial direction. This is of interest because magnetic flux leakage tools are commonly used for the detection and sizing of defects. In the present study we investigate the origin of this magnetic easy axis, using an angular magnetic Barkhausen noise technique to characterize the magnetic anisotropy. The texture, microstructure, and residual stress are examined as possible causes of the easy axis, using x-ray pole figure analysis and microstructural examination along with high and low temperature annealing treatments. Our results indicate that plastic deformation and residual stress are responsible for the magnetic easy axis, since an elimination of the residual stresses through low temperature "stress relief" heat treatment produces a magnetically isotropic structure without altering the texture or microstructure. X-ray pole figure analysis supports the conclusion that magnetic anisotropy is not related to texture in these materials. We conclude that the axial magnetic easy axis is due to a compressive residual hoop stress resulting from the cold bending and cold expansion of the pipe during processing. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370930
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular simulation of the comparative flexibility of bridging linkages in poly(aryl ether sulfone)s and poly(aryl ether ketone)s from a study of isolated oligomers (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Theory and Simulations 5 (1996), S. 305-320 
    Details
    ISSN: 1022-1344
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Atomistic molecular modelling of the bridging linkages in poly(aryl ether sulfone)s and poly(aryl ether ketone)s have been studied in vacuo. The results of these simulations indicate that models that have bond lengths and angles that agree with X-ray data are produced from the energy minimised structures and additionally that conformational analysis of these linkages produces low energy conformers that are also accessible in the X-ray data. The results of these simulations provide confidence in the modelling techniques used and indicate the potential for these models in further simulation of the bulk amorphous state.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mats.1996.040050211
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular modelling of high performance polymers (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 41 (1996), S. 151-157 
    Details
    ISSN: 0959-8103
    Keywords: molecular modelling ; linear epoxy ; linear polyarylethersulphone ; cross-linked polycyanurates ; Chemistry ; Polymer and Materials Science
    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: Progress on the molecular modelling of polymers is described based on examples studied in our laboratory. Simulation of the physico-mechanical properties of a linear epoxy resin, a linear polyarylethersulphone and two network-forming polycyanurates are described. The simulated constants are compared in all instances to experimentally determined constants to provide a means of assessing the accuracy of the simulations. Reasonable constants can be produced for the examples cited from simulation using relatively unsophisticated models.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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