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  • 1960-1964  (2)
  • 1
    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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  • 2
    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
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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