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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Experimental mechanics 1 (1961), S. 167-175 
    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 Plots of the stress function (obtained graphically from enlarged photos of the string net), and of the shear-stress distribution over the normal section of beams in cantilever loading, for beams of rectangular, and of circular section, compare well with the exact mathematical solutions. Regions of increasing stress, leading to points of stress concentration are clearly shown. String nets were built for rectangular sections of ratio of half widthb to half deptha, R=b/a=1/4, 1/2, 1, 2, 4, 8. The form of the net forR≦|1| suggested the assumption of a plane for part of φ(x, y). ForR≫|1| another simple approximation was assumed for φ(x, y). The simple approximate mathematical analyses obtained from the values of φ(x, y) helped to show where the concentrations of stress are and how they vary withR.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Experimental mechanics 1 (1961), S. 176-184 
    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 investigation of the fully plastic load-carrying capacity of aluminum-alloy I-beams with web cutouts leads to an interest in the elastic stress distribution for these cutouts. The photoelastic procedure was used to evaluate the elastic stress distribution at the surface of the web cutouts. The shear-difference method was used to establish the probable location of the fully plastic hinges which might be expected to form in the aluminum-alloy prototype. The data obtained were in good agreement with experimental results obtained on aluminum-alloy I-beams.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Experimental mechanics 1 (1961), S. 185-197 
    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 Methods are described for suspension-system vibration damping, automatically controlled induction heating through radiation pyrometers, rotating-disk temperature measurement, and unattended operation with a safety-interlock system.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Experimental mechanics 1 (1961), S. 198-202 
    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: Summary This paper deals with various applications of newly developed photoelastic gages for strain measurements on metallic and nonmetallic structural members. Simplicity of application and direct indication of the magnitude and the directions of the principal strains in biaxial-stress fields are some of the merits of photoelastic strain gages.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Experimental mechanics 1 (1961), S. 203-213 
    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: Synopsis Soil-motion records resulting from studies on “soil dynamics” are analyzed. The investigation is restricted to exciter-pickup distances ranging from 10 to 200 ft (microseismics). Periodic and nonperiodic exciter forces are discussed. Surface displacements in the vertical and longitudinal direction (plane trajectories) and combined with the transverse direction (triaxial motions) have been analyzed.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Experimental mechanics 1 (1961), S. 16-22 
    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 This paper describes the equipment and procedures used in testing a large multicell box beam under various combinations of applied loading and transient heating. Data are presented on the performance of radiant-heat lamps when enclosed by aluminum reflectors and powered by automobile-type batteries. In addition, solutions are given to the following special problems introduced by simulating fuel conditions: (1) sealing the specimen without disturbing the normal paths for heat flow; (2) protecting strain gages and thermocouples from the simulated fuel.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Experimental mechanics 1 (1961), S. 23-32 
    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 analysis is presented of the stresses induced in a thin tape by bending over pulleys, by axial tension and by twisting of the tape when running between two out-of-plane pulleys. Analytical results are compared with some photoelastic tests on tape models made of epoxy resin. The weak retardation produced by the thin tape is multiplied by repeated light passage through the tape and is measured by a bent-beam compensator. The tests are of especial interest because the rate of rotation of the principal stresses is higher than had been encountered before. Surprisingly, the experimental results uncorrected for rotation are in good agreement with the calculated stresses.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Experimental mechanics 1 (1961), S. 33-39 
    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 This paper reports stress distributions in epoxy-resin bars with reinforced circular holes under tension. The holes were reinforced by bonding aluminum rings to the bars inside the holes. The stress distributions were determined photoelastically. Various proportions of circular reinforcements and different widths of bars were investigated under pure tension. Stress distributions were determined in the epoxy-resin part of the bar, and the maximum shear stresses were given special attention. The relation between maximum shear stress and the width of the bar was determined, and the ranges for which the theoretical solution for an infinite bar approximates that for a finite bar were defined.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Experimental mechanics 1 (1961), S. 39-40 
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 10
    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 experimental phase of a study program relating to thermal effects on elastic deformations of built-up low-aspect-ratio wing structures is described. Techniques were developed for the experimental determination of deflection-influence coefficients for wings subjected to elevated temperatures and temperature gradients. Tests were conducted on two model wings and numerous deflection-influence coefficient sets were determined for various temperature distributions. Details of the models, the testing apparatus and instrumentation and selected test results and comparisons are given.
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