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  • 1
    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 Since experimental techniques using dynamic photoelasticity are, in general, limited by suitably intense monochromatic light sources, it was of primary importance to describe a ruby-laser system which would completely remove this particular aspect of the problem. Modulation of the system, in this case by a Kerr cell, provides the necessary control of the light output such that a complete series of results can be obtained by putting together the results of many individual tests recorded on a conventional still camera. In this case, the dynamic-stress-concentration factor in a strut with a symmetrically located circular discontinuity was determined to establish definitely the potential of the system.
    Type of Medium: Electronic Resource
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  • 2
    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 Holographic interferometry provides an elegant and very sensitive displacement measurement means for the experimental stress analyst. Recently however, a related optical techniques, “diffractography”, has been developed which offers an alternative to holography in many cases, particularly in those experiments where information along one or more discrete lines is sufficient. This paper compares both approaches and presents new experimental data on deflections of a cantilever steel plate obtained using both techniques.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Experimental mechanics 11 (1971), S. 565-568 
    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 A method for measuring strain using diffraction of light from a single aperture is described, and results of a comparison tensile test with an electrical-resistance strain gage are presented. The “diffractographic strain gage” is shown to have high sensitivity, linearity, accuracy and temperature compensation and the ability to operate in a variety of hostile environments. It is furthermore simple, inexpensive, and the data can be collected by eye without assistance from further instrumentation.
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  • 4
    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 In this investigation, the magnitude and position of the maximum stresses, as well as the stress distributions at critical sections of internally loaded conduits, were determined by experimental photoelasticity. The conduits tested had circular internal boundaries and square, octagonal and sixteen-sided polygon external boundaries. The photoelastic material used to make the models was Catalin 61-893. Curves of stress distribution have been plotted for the various shapes and sections, making rapid and economical design of the shapes possible. A technique for applying known internal pressures to conduit photoelastic models was developed in order to carry out the investigation. This involved a fixture embodying a rubber pressure disk and a helical spring.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Experimental mechanics 12 (1972), S. 341-344 
    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 recently described ditfractographic technique1, utilizing the diffraction of light passing through an aperture formed by two edges, one fixed as a reference, is used to determine small vibratory displacements. The transducer has little or no inertia, is noncontacting, and has high sensitivity and accuracy. A “time averaged” method is presented whereby peak amplitudes can be obtained with no readout instrumentation and no upper-frequency limit. Alternatively, a photodetector can be used to determine vibration amplitudes with frequency response limited only by the detector circuit.
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  • 6
    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 diffractographic method, a recently developed experimental technique, has been extended to solve the problem of determining the displacement information along the length of a beam. The method, which uses the diffraction of monochromatic light through a variable aperture whose size is a function of the beam displacement, demonstrates that this displacement along a line technique offers a new and accurate method occupying the unique position between point detectors and whole-field procedures.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Experimental mechanics 12 (1972), S. 420-422 
    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 Described is a novel torque sensor utilizing changes in the diffraction pattern of a slit aperture whose edges move relative to each other in proportion to the applied torque. In common with other electro-optical torque sensors, the device is ‘noncontacting’ and, therefore, requires no slip rings and may be read visually. In this form, it is a very simple and inexpensive device, exhibiting no zero shift and capable of operation in extreme environments. The principal disadvantage of the device is its inability to sense torque continuously through the rotational cycle.
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  • 8
    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 Three-dimensional photoelastic studies of stresses around an asymmetrically reinforced circular cut-out in a flat plate under uniform unidirectional stress are reported. The frozen-stress technique, with Hysol 4290 material, was used to determine the stress distribution through four critical points on the boundary of the reinforced hole. Included were models with different cross sections of reinforcement, with various interface fillet radii and with different plate widths. For the majority of models, the ratio of volume of reinforcement to volume of hole was unity. It is concluded that, for reducing the stress concentration, there is a limit on the effectiveness of increasing the fillet radius beyond half the plate thickness. It was found that a reinforcement having a thickness of approximately 40 percent of the plate thickness was optimum and that the stress concentration decreases with volume of reinforcement. The authors believe that, with judgment, some of the conclusions reached may be applied, for design purposes, beyond the specific dimensional ranges and loading conditions of the tests.
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