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  • 1965-1969  (4)
  • 1960-1964  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Approximate stress intensity factor for an embedded elliptical crack near two parallel free surfaces (1965)
    Springer
    International journal of fracture 1 (1965), S. 81-95 
    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 Un facteur approché d'intensité de contrainte est obtenu pour une fracture elliptique encastrée dans une plaque soumise à une tension uniaxiale dans la direction perpendiculaire à la surface de la fracture. Le grand axe d'une fracture elliptique excentrique est supposé être parallèle aux deux surfaces de la plaque. Les facteurs approches d'intensité de contrainte, le long du petit axe de la fracture elliptique sont déterminés par αBσ√a √π où a est un facteur de correction dû à la courbure de l'ellipse et β est un facteur de correction dû à l'excentricité de la fracture dans le mur.
    Abstract: Zusammenfassung Es wird ein angenaeherter Faktor fuer die Spannungskonzentration an einem elliptischen Riss, der in einen Platte unter einachsiger Zugspannung eingeschlossen ist, abgeleitet. Die Zugspannungsrichtung ist senkrecht zur Rissoberflaeche. Es wird angenommen, dass die Hauptachse des exzentrisch gelagerten Risses parallel zu den beiden Plattenoberflaechen ist. Fuer den angenaeherten Faktor der Spannungskonzentration an der kleineren Hauptachse des elliptischen Risses ergibt sich dann αBσ√a√π wobei α ein Korrekturfaktor fuer die Ellipsenkruemmung ist und β einen Korrekturfaktor fuer die Exzentrizitaet des Risses in der Platte bedeutet.
    Notes: Abstract An approximate stress intensity factor is derived for an embedded elliptical crack in a plate which is subjected to uniaxial tension in the direction perpendicular to the crack surface. The major axis of an eccentrically located elliptical crack is assumed to be parallel with the two plate surfaces. The approximate stress intensity factors on the minor axis of the elliptical crack are then determined as αBσ√a√π where a is a correction factor due to the curvature of the ellipse and 6 is a correction factor due to the eccentricity of the crack in the wall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00186746
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Exploratory study on optimum coining for improvement of fatigue life (1964)
    Springer
    Experimental mechanics 4 (1964), S. 297-305 
    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 Residual compressive tangential stress in the material around the edge of a hole in a plate can be obtained by overstraining the material with a coined ring in the vicinity of the hole. The residual stress at the edge of the hole can then be utilized to reduce the peak tangential tensile stress due to applied loading and thus increase the fatigue life. Residual-stress distributions resulting from three sizes of coined ring diameters and different degrees of overstraining as determined by modified Sachs boring-out method and Bühler turn-off method are given. Surface strain measurements on the plates were also made to compare surface-strain measurements with average-strain measurements from the boring-out and turning-off techniques. The results by these techniques are compared with results obtained from Lamé's equations for thickwalled cylinders with interference. A method is proposed for determining the optimum amount of overstraining for a given hole diameter and applied peak load. Results of fatigue tests utilizing the overstraining technique are given which indicate an appreciable improvement in the fatigue life of the specimens tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02321424
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Temperature distributions and thermal stresses in a partially filled annulus (1966)
    Springer
    Experimental mechanics 6 (1966), S. 602-608 
    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 The problem consists of determining the temperature distribution and the thermal stresses in an annulus partly filled with a cold fluid with free convection in air as the outer thermal-boundary condition. An iterative computer solution provided temperature distributions which were compared to those measured experimentally. Analytical calculations of the stresses using Fourier series expression for the temperature distribution agreed with experimental results by photothermoelasticity. The stress-intensity factors determined by photothermoelasticity for partly filled annuli with a crack extending radially 1/5 of the wall thickness were compared with approximate analytical methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02326828
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Transient analysis in a fracturing magnesium plate (1967)
    Springer
    Experimental mechanics 7 (1967), S. 434-440 
    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 Transient displacement and strain distributions in the vicinity of running-crack tips were determined experimentally in centrally notched magnesium plates. The moiré-fringe technique was used together with a Q-spoiled laser which was the light source for single-flash photography. The specimen was designed such that net-section yield occurred prior to fracture and, thus, the crack propagated through the yielded region. Displacement distributions in the vicinity of such running-crack tips were found to vary as $$\sqrt r $$ for radial distances as close asr=0.08 in. Transient moiré-fringe patterns were then differentiated graphically to obtain longitudinal strain distributions in the vicinities of running-crack tips. These transient-displacement and transient-strain distributions were compared with equivalent static results. For this ductile material, both the transient and static results showed qualitative agreement with the displacement and strain distributions in an infinitely elastic plate in the region ahead of the crack tip. For the region above the crack tip, the transient and static results differed appreciably.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02326302
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Crack-opening displacements and normal strains in centrally notched plates (1969)
    Springer
    Experimental mechanics 9 (1969), S. 163-170 
    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 Experimentally determined crack-opening displacements of stationary and running cracks and of inclined stationary cracks in centrally notched plates are reported in this paper. The moiré-fringe technique was used for the determination of displacement fields in test specimens of magnesium, 7075-T6 and 7178-T6 aluminum alloys. Experimentally determined crack-opening displacements were compared with corresponding re ults based on theoretical models of Westergaard, Dugdale, Craggs and Craggs-Dugdale. In addition, normal-strain fields derived from the moiré-fringe data were compared with static or dynamic strain fields of these theoretical models. The results of this investigation indicate that while the Dugdale crack is a fair model of a stationary crack in ductile materials, the Craggs crack appears to be a better representation of a running crack in the ductile materials investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02326565
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Fringe multiplication and thickness effects in birefringent coating (1962)
    Springer
    Experimental mechanics 2 (1962), S. 115-121 
    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 The feasibility of applying fringe-multiplication technique in birefringent-coating analysis is studied, and the conditions under which this technique can be used are discussed. The fringe-multiplication technique is then applied to birefringent-coating analysis of a plate with a central circular hole under uniaxial tension. The experimental results are then compared with Howland's analytical results for the shear-stress distribution along the minimum cross section and for normal stress distribution along the edge of the plate. Duffy's correction factors for curvatures and strain gradients are used to estimate the correction in the latter experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02325751
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    Paper (German National Licenses)
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