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  • 1
    Electronic Resource
    Electronic Resource
    VESTIBULAR HABITUATION IN MAN AND MONKEY DURING SINUSOIDAL ROTATION (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 374 (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.tb30880.x
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  • 2
    Electronic Resource
    Electronic Resource
    The use of the cooling-history of thick intrusive sheets for the study of the secular variation of the earth's magnetic field (1956)
    Springer
    Pure and applied geophysics 35 (1956), S. 49-53 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Numerical results are given which show the way in which thc Curie temperature moves inwards from the margin during the cooling of a thick intrusive sheet. The time taken to move from the margin to the centre varies as the square of the thickness of the sheet, being about 6500 years for a sheet 1000 m thick on reasonable assumptions as to the thermal properties of the material. This implies that the secular variation of the Earth's magnetic field over periods of time of 1000 years or more may be studied by measuring the directions of magnetisation at a series of points across the thickness of such a sheet. Some measurements on a Tasmanian sill about 430 m thick of Jurassic or Cretaceous age suggest a change from maximum to minimum inclination in a time of about 200 years. Since the margins of the sill are not available this figure may be considerably in error but the results suggest the general practicability of the method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02122865
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  • 3
    Electronic Resource
    Electronic Resource
    The frictional properties of joints in rock (1959)
    Springer
    Pure and applied geophysics 43 (1959), S. 148-158 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary The conditions for sliding over artificial joint surfaces have been studied experimentally by cutting rock cylinders at various angles to their axes and studying slip over these surfaces in a triaxial testing apparatus. The types of joint used were: (i) filled with plaster to simulate a soft joint filling, (ii) bare surfaces ground approximately flat, and (iii) natural surfaces across which shear failure had taken place. The results agreed reasonably well with the simple theory for a constant coefficient of friction. Measured coefficients of friction lie in the range 0.5–0.8 and differ by surprisingly little between the various surfaces. The surfaces across which sliding has taken place exhibit interesting slickenside phenomena. Subsidiary failures frequently occur which cut across the joint surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01993552
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  • 4
    Electronic Resource
    Electronic Resource
    Lees's topographic correction in heat flow and the geothermal flux in Tasmania (1963)
    Springer
    Pure and applied geophysics 54 (1963), S. 53-63 
    Details
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Summary Lees's topographic correction for a simple idealized hill is discussed and extended to a monoclinal structure. It is valuable as giving very simply the order of magnitude of the correction. A number of new measurements of temperature in Tasmanian boreholes has been made and the previous rather high value of over 2μ cal/cm2 sec for the heat flux has been confirmed. The variation of thermal conductivity through the thickness of a differentiated tholeiite sheet has been measured and found to be in reasonably good agreement with values calculated from chemical and modal analyses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01988254
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  • 5
    Electronic Resource
    Electronic Resource
    Prismatic dental enamel in theropod dinosaurs (1986)
    Springer
    Naturwissenschaften 73 (1986), S. 326-327 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00451481
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  • 6
    Electronic Resource
    Electronic Resource
    Axi-symmetric bodies of equal material in contact under torsion or shift (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 478-487 
    Details
    ISSN: 1432-0681
    Keywords: Key words Contact problem of elasticity ; superposition ; flat punch solutions ; annular sliding ; stick area.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary  Two axi-symmetric bodies are pressed together, so that their axes of symmetry coincide with the contact normal and the normal force is held constant. A small torque about the contact normal or a small tangential force is applied. For bodies of equal material, the normal and tangential stress states are uncoupled, and can be solved separately. The surfaces of the bodies are thought as a superposition of infinitesimal rigid flat-ended punches. Consequently, the normal stress distribution can be calculated as a summation of differential flat punch solutions. A formula results, which is identical with the solution of Green and Collins. After application of a torque an annular sliding area forms at the border of the contact area. For reasons of symmetry, the common displacement of the inner stick area must be a rigid body rotation. Similarly to the normal problem, the solution can be thought as a superposition of rigid punch rotations. The tangential solution can be derived analogically, in form of a superposition of rigid punch displacements. The present method also solves the problem of simultaneous normal and torsional or tangential loading with complete adhesion. As an example, Steuermann’s problem for polynomial surfaces of the form A 2 n r2 n is solved. The solutions for constant normal forces can be used as basic functions for loading histories with varying normal and tangential forces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00835661
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  • 7
    Electronic Resource
    Electronic Resource
    Uniaxial deformation of a random packing of particles (1999)
    Springer
    Archive of applied mechanics 69 (1999), S. 181-203 
    Details
    ISSN: 1432-0681
    Keywords: Key words granular material ; generalized Hertz contact ; elastic friction ; nonlinear elasticity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Mechanical behavior of dense packing spheres with small irregularities is investigated in this paper. A generalization of the hertzian contact model for surfaces of the form x k yields a normal contact force F n , which is proportional to ζ1+1/ k , with the normal displacement ζ. For oblique forces, the frictional force can be calculated, [10]. Different load cases are explained in detail. It is shown that the stress-strain curve during initial loading of the packing is identical with the force-displacement relation at the contact point, using an appropriate constant. The results for uniaxial loading, unloading and reloading are illustrated. As experimentally observed, the axial pressure in unloading is smaller than during loading, while the lateral pressure increases. The stress-strain relation is compared with well-known empirical relations of rock and soil mechanics, and the wave velocity for spherical irregularities agrees with earlier geomechanical theories for random packing of smooth spheres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004190050213
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  • 8
    Electronic Resource
    Electronic Resource
    Half-planes without coupling under contact loading (1997)
    Springer
    Archive of applied mechanics 67 (1997), S. 247-259 
    Details
    ISSN: 1432-0681
    Keywords: Key words uncoupled contact ; plane elasticity ; Cattaneo-Mindlin principle ; elastic friction ; singular integrals.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Nonrotating half-planes in contact under oblique loading are investigated in this paper. The solution is based on the influence integrals of the Flamant solution. The problem is determined by two integral equations for the normal and tangential stresses, which are uncoupled for special cases, as bodies of similar material in contact. In order to simplify the singular integrals, the method of superposition of flat punches is used. The result for the symmetric case is almost identical with the axisymmetric solution. For polynomial profiles of the form x s , the Muskhelishvili potentials can be written in terms of a complex hypergeometric function. The interior stress field is illustrated for an example.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004190050115
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  • 9
    Electronic Resource
    Electronic Resource
    Axi-symmetric bodies of equal material in contact under torsion or shift (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 478-487 
    Details
    ISSN: 1432-0681
    Keywords: Contact problem of elasticity ; superposition ; flat punch solutions ; annular sliding ; stick area
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Two axi-symmetric bodies are pressed together, so that their axes of symmetry coincide with the contact normal and the normal force is held constant. A small torque about the contact normal or a small tangential force is applied. For bodies of equal material, the normal and tangential stress states are uncoupled, and can solved separately. The surfaces of the bodies are thought as a superposition of infinitesimal rigid flat-ended punches. Consequently, the normal stress distribution can be calculated as a summation of differential flat punch solutions. A formula results, which is identical with the solution of Green and Collins. After application of a torque an annular sliding area forms at the border of the contact area. For reasons of symmetry, the common displacement of the inner stick area must be a rigid body rotation. Similarly to the normal problem, the solution can be thought as a superposition of rigid punch rotations. The tangential solution can be derived analogically, in form of a superposition of rigid punch displacements. The present method also solves the problem of simultanous normal and torsional or tangential loading with complete adhesion. As an example, Steuermann's problem for polynomial surfaces of the formA 2nr2nis solved. The solutions for constant normal forces can be used as basic functions for loading histories with varying normal and tangential forces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00835661
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  • 10
    Electronic Resource
    Electronic Resource
    Torsional impact of elastic spheres (1994)
    Springer
    Archive of applied mechanics 64 (1994), S. 235-248 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht In diesem Artikel wird der Stoß zweier geometrisch und materiell ähnlicher Kugeln untersucht, welche um die gemeinsame Normale ihres Kontaktgebietes rotieren. Die Lösung des statischen Kontaktproblems, bei welchem die Kugeln durch eine konstante Normalkraft zusammengedrückt und anschließend durch ein monoton steigendes Torsionsmoment um die Kontaktnormale belastet werden, wurde von Lubkin gefunden. Die Überlagerung der Lubkin-Funktionen für unterschiedliche Kontaktgebiete ergibt das allgemeine Kontaktgesetz für eine Folge endlicher Normalverschiebungs-und Torsionsinkremente. Die Drehung am Stoßende erhält man durch numerische Integration der Drallgleichung und des Kontaktgesetzes. Die Nassi-Shneiderman-Diagramme des Kontaktalgorithmus und des Stoßprogramms werden abgebildet. Einige Ergebnisse werden vorgestellt und mit einer asymptotischen Theorie für vollständiges Haften und vollständiges Gleiten verglichen.
    Notes: Summary In this article, the collison of two geometrically and materially similar elastic spheres, which are rotating around the common normal of their contact area, is analysed. The solution of the static problem, when the spheres are pressed together by a constant normal force and are then subjected to a monotonously increasing torsional couple about the contact normal, has been found by Lubkin. Superposition of Lubkin's solutions for varying contact areas yields the general contact law for finite sequences for normal and torsional displacement increments. The torsional rotation at the end of impact is obtained from numerical integration of the angular equation of motion and the contact law. The Nassi-Shneiderman diagrams of the contact algorithm and the impact algorithm are presented. Some results are plotted and compared with an asymptotic theory for complete adhesion and complete sliding in the contact area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00789122
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