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  • 1
    Electronic Resource
    Electronic Resource
    The ring cracking of glass by spherical indenters
    Amsterdam : Elsevier
    Journal of the Mechanics and Physics of Solids 15 (1967), S. 401-406 
    Details
    ISSN: 0022-5096
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-5096(67)90011-7
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  • 2
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    Unknown
    Book Reviews (1968)
    Kingston, Jamaica : Periodicals Archive Online (PAO)
    Social and economic studies. 17:4 (1968:Dec.) 476 
    Details
    ISSN: 0037-7651
    Topics: Sociology , Economics
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:5209-1968-017-04-000011
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  • 3
    Electronic Resource
    Electronic Resource
    Some observations on Sih's strain energy density approach for fracture prediction (1974)
    Springer
    International journal of fracture 10 (1974), S. 136-138 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00955094
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of spherical pores on the strength of a polycrystalline ceramic (1977)
    Springer
    International journal of fracture 13 (1977), S. 215-223 
    Details
    ISSN: 1573-2673
    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: Résumé Les essais de flexion sur un matériau céramique: zirconate-titanate de plomb, avec des quantités variables de porosités, montrent que la diminution de la résistance due à la porosité est plus faible que celle donnée par le facteur de concentration de contraintes. En utilisant la méthode statistique de Weibull pour la résistance fragile, il est montré que des prévisions raisonables peuvent être faites pour déterminer la résistance médiane pour une porosité jusqu'aux environs de dix pourcents.
    Notes: Abstract Bending tests on a ceramic material, lead zirconate-titanate, with varying amounts of porosity, show that the decrease in strength due to spherical pores is much less than would be expected from the stress concentration factor. Using the Weibull probabilistic approach to brittle strength, it is shown that reasonable predictions may be made for the median strength for porosity up to about ten percent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042561
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  • 5
    Electronic Resource
    Electronic Resource
    The prediction of fracture in brittle solids subjected to very short duration tensile stresses (1977)
    Springer
    International journal of fracture 13 (1977), S. 115-131 
    Details
    ISSN: 1573-2673
    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: Résumé Le mécanisme de rupture d'un solide fragile soumis à une charge de traction de courte durée diffère fondamentalement de celui obtenu par une mise en charge prolongée. Pour une charge statique ou dans le cas des impulsions à contrainte prolongée, l'initiation de la propagation d'un simple défaut inhérent peut conduire à une séparation complète des parties. Par contraste, si la mise en charge est de courte durée, plusieurs microfissures s'initient et se propagent de telle façon qu'elles peuvent s'enchainer et créer une surface de rupture pendant la période de charge. Une théorie simple est proposée reliant les valeurs de la résistance observée pour des impulsions de contraintes de courte durée à la distribution des défauts inhérents dans le matériau. Une corrélation favorable est démontrée avec les résultats expérimentaux obtenus en soumettant divers types de roches à l'action de faisceaux d'électrons durant des fractions de microsecondes et jusqu'à plusieurs microsecondes.
    Notes: Abstract The failure mechanism of brittle solids under very short duration tensile loading differs basically from that under prolonged tensile loads. Under static loading, or long stress pulses, the initiation and propagation of a single inherent flaw may lead to complete separation of the part. By contrast, if the loading is of very short duration, many cracks have to initiate and propagate so that they can link up and create a fracture surface during the loading period. A simple theory is proposed which relates the strength values observed under short duration stress pulses to the distribution of inherent flaws in the material. The prediction is shown to compare favorably with experimental results obtained by subjecting several types of rock to electron beams which produce stress pulses lasting from fractions of a microsecond to several microseconds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042555
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  • 6
    Electronic Resource
    Electronic Resource
    Some observations on the wear of single point diamond tools used for machining glass (1981)
    Springer
    Journal of materials science 16 (1981), S. 1776-1784 
    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 The wear pattern on a single point diamond tool used for machining glass is studied. Possible wear mechanisms are proposed on the basis of additional sliding wear tests and observations by scanning electron and optical microscopy. The wear process is believed to take place in two stages, one involving a polishing mechanism and the other consisting of crack propagation which occurs after the accumulation of a certain amount of damage. The importance of the crystallographic orientation of the diamond single crystal, particularly for crack propagation along cleavage planes is pointed out. It is concluded that the likelihood of rapid deterioration of the diamond tool may be decreased by proper crystallographic orientation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540624
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  • 7
    Electronic Resource
    Electronic Resource
    On the machining of glass (1980)
    Springer
    Journal of materials science 15 (1980), S. 2508-2514 
    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 study to examine the feasibility of cutting glass in the same manner as ductile metals was carried out on three types of glass (soda-lime microscope slides, carefully polished specimens of lead-doped flint and fused silica). No success was obtained with fused silica while soda-lime glass showed clear evidence of cutting in a manner similar to ductile metals, but provided variable results with different specimens. The most encouraging results were obtained with the lead-doped flint glass. Using a diamond tool with a semicircular face at a rake angle of −34°, crackfree cuts were produced with widths and depths up to about 100 and 1.6 μm, respectively. The “chips” produced during this machining are tightly curled with a serrated concave side. The results of this preliminary investigation suggest many aspects for further study. However, the essential conclusion is that certain glasses may be machined in a manner similar to ductile metals if the “size” of the cut is small enough.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00550754
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  • 8
    Electronic Resource
    Electronic Resource
    An experimental investigation of crack-path directional stability (1980)
    Springer
    Experimental mechanics 20 (1980), S. 17-23 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Using the criterion that a crack will extend perpendicular to the maximum circumferential stress,σ θ, we show that the directional stability of crack growth is governed by the location of microcrack initiation ahead of the crack tip. At distances greater than a geometrical radiusr o, the maximum value ofσ θ deviates from the position of symmetry. Thus, if we assume that the physical processes involved in fracture lead to crack initiation at a distancer c ahead of the crack tip, the criterion for directional stability isr o〉r c. Experimental and theoretical values ofr o verify that, asr o becomes small, the crack's directional stability deteriorates. Observing that a lengthwise compressive stress increasesr o, a center-cracked specimen was developed which allows the application of controlled lengthwise compression independently of the opening-mode load. A detailed photoelastic analysis of the specimen has provided the value ofr o as a function of the crack length. The value ofr o is then compared with the expected microcrack initiation distances in ductile fracture. By applying sufficient lengthwise compression, we are able to make the crack grow straight and obtain numerous data points from this specimen which would otherwise be directionally unstable. The results indicate that, as the total lengthwise tensile stress at the crack tip increases, the fracture toughness also increases. Using this information we can then adjustK Ic for zero lengthwise loading and obtain a geometry independent fracture toughness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02324422
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  • 9
    Electronic Resource
    Electronic Resource
    Examination of the computational model for the layer-removal method for residual-stress measurement (1986)
    Springer
    Experimental mechanics 26 (1986), S. 150-153 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An analytical solution is presented to examine the accuracy of the ‘layer-removal’ method for measuring localized residual stresses. In this approach, strips, which may have been cut from a pipe or a plate, have strain-gage rosettes placed on one face and layers removed from the other face. The strain measurements are used to deduce the residual stress in the layers removed. The stress measured is that along the axis of the strip. It may vary rapidly with axial distance, as for example when the strip is taken from a welded part. The present analysis shows that the actual stress distribution may be quite different from that predicted by the computational model normally used in the layer-removal method. It shows that the difference increases as the ratio of the heighth of the strip from which a layer is removed to the half dimensiona of the localized residual-stress zone increases. It is recommended that the layer-removal method can be used for measuring residual stresses for cases in which the ratio ofh/a is less than or equal to unity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02320007
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  • 10
    Electronic Resource
    Electronic Resource
    Experimental determination of stress intensity factors due to residual stresses (1997)
    Springer
    Experimental mechanics 37 (1997), S. 272-277 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract An experimental method is presented that enables stress intensity factors due to residual stress to be determined directly, without prior determination of the residual stress. The method is based on the crack compliance method, where a narrow cut is introduced progressively into the considered component, and the resulting strain change is measured by a strain gage. The required mathematical relations to determine stress intensity factors from strain measurements are established by means of some basic relations of linear elastic fracture mechanics. They are derived explicitly for two exemplary geometrical systems, which allowed for analytical treatment. Experimental data obtained in the case of a steel roller are presented and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02317418
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