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  • 1
    ISSN: 1432-0959
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A method is presented which allows to compute the stress intensity factors (SIFs) of a ceramic roller bearing ring with a surface flaw. First, the stresses due to mechanical loads applied to the surfaces of the undamaged ring are computed, using Michell's expression for Airy's stress function in polar coordinates ([l]). Second, the stress intensity factors of the flaw are obtained using Tada's additivity principle ([2]), namely by integration of the point force solution for the SIF of a surface crack with the aforementioned stresses as input parameter. To illustrate the procedure, the special case of a ring with a surface flaw which is loaded by six equidistantly spaced cylindrical rollers will be studied numerically.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0959
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Stress-induced transformation toughening in Zirconia-containing ceramics is described analytically by means of a quantitative model: A Griffith crack which interacts with a transformed, circular Zirconia inclusion. Due to its volume expansion, a ZrO2-particle compresses its flanks, whereas a particle in front of the crack opens the flanks such that the crack will be attracted and finally absorbed. Erdogan's integral equation technique is applied to calculate the dislocation functions and the stress-intensity-factors which correspond to these situations. In order to derive analytical expressions, the elastic constants of the inclusion and the matrix are assumed to be equal.
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  • 3
    ISSN: 1432-0959
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. A method is presented which allows to compute the stress intensity factors (SIFs) of a ceramic roller bearing ring with a surface flaw. First, the stresses due to mechanical loads applied to the surfaces of the undamaged ring are computed, using Mitchell's expression for Airy's stress function in polar coordinates ([1]). Second, the stress intensity factors of the flaw are obtained using Tada's activity principle ([2]), namely by integration of the point force solution for the SIF of a surface crack with the aforementioned stresses as input parameter. To illustrate the procedure, the special case of a ring with a surface flaw which is loaded by six equidistantly spaced cylindrical rollers will be studied numerically.
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  • 4
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The volume dependence of the superconducting transition temperatureT c of amorphous and highly disordered films is investigated by bending the film substrate. The volume coefficientd InT c /d InV of annealed Sn and Pb films agrees with the volume coefficient known from hydrostatic pressure experiments. This bending technique is applied to superconducting modifications which can be produced only by quench condensation onto a substrate at liquid helium temperature. Amorphous films such as Bi, Ga, Sn90Cu10 and PbxBi1−x, as well as highly disordered Sn and Pb films, are investigated. The relations found between the volume coefficient, the electron-phonon coupling constant λ and the Grüneisen parameter γ G are in reasonable agreement with the volume dependence ofT c for non-transition metals, obtained on the basis of the McMillan equation. In particular, the results represent an expansion of this kind of investigation to very strong-coupling superconductors.
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  • 5
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Hall coefficients measured on quenched condensed Sb-Au films with a gold content between approximately 30 and 80 at % agree well with the results obtained in corresponding liquid Sb-Cu alloys. This supports the picture, that the films are formed in a liquidlike amorphous phase in agreement with recent structure measurements. The results can be described approximately with the free electron model. Deviations from this model, which occur at high gold concentrations, are discussed.
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  • 6
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The volume dependence of the superconducting transition temperatureT c of quench-condensed Be films is investigated by bending the substrate of the film. Tensile strain causes an increase, compressive strain a decrease ofT c . The volume coefficientd lnT c /d lnV is about 0.8, a value which is small compared with those of other weakcopling non-transition metals. In addition to pure films, Be films stabilized by codeposition of noble metals or Ge are investigated.
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  • 7
    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
    Notes: Summary The J-integral technique is used to assess the risk of defects in a particular structure by explicit computation of the arising generalized forces. Three different situations are considered: stress concentrators in cycloidal specimens, the interaction of a dislocation with a circular inclusion, and the interaction between two dislocations. Special emphasis is given to an effective but analytical calculation of the corresponding path integrals.
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  • 8
    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
    Notes: Summary Continuous and discrete Fourier transforms (CFT and DFT, respectively) are used to derive a formal solution for the Fourier transforms of stresses and strains that develop in elastically homogeneous but arbitrarily eigenstrained linear-elastic bodies. The solution is then specialized to the case of a dilatorically eigenstrained cylindrical region in an infinite matrix, both of which are made of the same cubic material with the same orientation of principal axes. In the continuous case all integrations necessary for the inverse Fourier transformation can be carried out explicitly provided the material is “slightly” cubic. This results in an approximate but analytical expression for the stresses and strains in physical space. Moreover, the stress-strain fields inside of the inclusion prove to be of the Eshelby type, i.e., they are homogeneous and isotropic. The range of validity of the analytical solution is assessed numerically by means of discrete Fourier transforms (DFT). It is demonstrated that even for strongly cubic materials the stresses and strains are quite well represented by the aforementioned approximate solution. Moreover, the total elastic energy of two eigenstrained cylindrical inclusions in slightly cubic material with the same orientation of their principal axes is calculated analytically by means of CFT. The minimum of the energy is determined as a function of the relative position of the two inclusions with respect to the crystal axes and it is used to explain the formation of textures in cubic materials.
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  • 9
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 38 (1966), S. 1407-1408 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 30 (1965), S. 2342-2344 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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