Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1970-1974  (2)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 96 (1972), S. 106-126 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Investigated is the effect of a surface irregularity on the propagation of waves in an isotropic, elastic plate, the method of perturbation being employed to determine the scattered field to the first order in a small parameter descriptive of the height of the irregularity. While the firstorder displacement field in the region under, and in the immediate vicinity of, the disturbed surface is very complicated, the far field in either direction, generated by either a symmetric or an antisymmetric incident wave, consists of a finite number of propagating waves, symmetric and antisymmetric, their number corresponding to the number of real roots of the frequency equation for the given frequency of incident wave. The general, analytical, results are then applied to the example of a plate having a small triangular protrusion or indentation on one of its surfaces, and the displacement is displayed in graphical form. In the course of the investigation it is shown that the roots of the Rayleigh-Lamb frequency equation are symmetrically located about the axes of the reals and imaginaries.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta mechanica 16 (1973), S. 45-64 
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Gleichungen zur Berücksichtigung des Temperatureinflusses auf das dynamische Verhalten von zweiphasigen Werkstoffen, wie z. B. durchtränkte Gesteine, werden angegeben. Die Werkstoffgleichungen zeigen das Auftreten verschiedener Kopplungskoeffizienten. Zwei dieser Koeffizienten scheinen unbekannt zu sein, der dritte bekannt, aber bisher noch nie gemessen. Die ersten beiden Koeffizienten stehen in Zusammenhang mit der thermischen Ausdehnung, der dritte mit dem lokalen Wärmefluß zwischen den Phasen. Über die Messung dieser Größen für kerosingefüllten Sandstein wird berichtet. Die der Ausbreitung ebener Wellen entsprechenden Lösungen der Gleichungen werden untersucht und es wird gezeigt, da\ in einem isotropen “thermoporoelastischen” Körper im allgemeinen vier verschiedene Dilatationsbewegungen auftreten. Zwei entsprechen Modifikationen der “schnellen” und “langsamen” Wellen eines Zweiphasengemisches bei konstanter Temperature, die beiden anderen sind diffusionsähnliche Bewegungsarten entsprechend denT-Wellen eines einphasigen thermoelastischen Festkörpers. Abschließend werden numerische Ergebnisse für die Dispersion und das Abklingen dieser Wellen bei seismischen Frequenzen für kerosingefüllten Sandstein angegeben.
    Notes: Summary Equations are formulated to account for the effects of temperature on the dynamical behavior of two-phase materials typified by liquid-saturated rocks. The constitutive relations reveal the existence of several interesting coupling coefficients, two of which appear to have gone unnoticed heretofore and a third, though noticed, never before measured. Specifically, the first two coefficients are associated with thermal expansion and the third with local heat flow between the phases. Experimental work is reported on the measurement of these quantities for a kerosene-saturated sandstone. Solutions of the field equations are then studied appropriate to the propagation of plane waves, and it is shown that in an isotropic, “thermoporoelastic” medium there exist, in general, four distinct dilatational motions. Two of these represent modifications of the “fast” and “slow” waves in a two-phase medium at constant temperature, the other two are diffusion-like modes analogous to theT-waves in a single-phase thermoelastic solid. Finally, for values of material constants corresponding to the kerosene-filled sandstone mentioned above, results of numerical calculations are displayed for the dispersion and attenuation of these waves at seismic frequencies.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...