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  • 1
    Electronic Resource
    Electronic Resource
    A global collocation technique for the solution of opening mode crack problems (1991)
    Springer
    International journal of fracture 49 (1991), S. 273-289 
    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
    Notes: Abstract A review of various experimental and numerical techniques for determination of fracture mechanics calibration functions (i.e., the variation of K 1 and CMOD with crack length) revealed that neither technique, employed independently, can determine K 1, CMOD, and full field stresses in closed form over a wide range of crack lengths. To fill this void, a combined experimental/numerical collocation technique based on a series expansion of the modified Westergaard functions was developed. This technique uses both boundary conditions, known a priori, and interior stress field conditions, determined using a suitable experimental technique, for analysis of two dimensional, finite body, opening mode crack problems. This paper reports on an investigation of the accuracy of this technique and its sensitivity to errors in experimental data for a sample problem of practical interest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042196
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Strain-gage methods for measuring the opening-mode stress-intensity factor,K I (1987)
    Springer
    Experimental mechanics 27 (1987), S. 381-388 
    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 Measurements of strain near a crak tip with electrical-resistance strain gages do not usually provide a reliable measure ofK I because of local yielding, three-dimensional effects and limited regions for strain-gage placement. This paper develops expressions for the strains in a valid region removed from the crack tip, and indicates procedures for locating and orienting the gages to accurately determineK I from one or more strain-gage readings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02330311
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The influence of grating characteristics on moiré fringe multiplication (1988)
    Springer
    Experimental mechanics 28 (1988), S. 329-335 
    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 Coherent optical techniques of fringe multiplication can be used to enhance the sensitivity of moiré measurements. However, for some coherent optical-processing systems, the significance of the resulting interference pattern is influenced by the characteristics of the gratings being processed. Analysis of one commonly used system for fringe multiplication involving two bar and space amplitude gratings reveals that accuracy of displacements and strains calculated from a fringe pattern is very sensitive to the transmission ratios of the gratings being processed. For variations of the transmission ratio of only 10 percent from the ideal case of 50 percent, the interference patterns produced by optical processing no longer correspond to multiplied moiré-fringe patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02325171
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A comparison of static and dynamic properties of photoelastic materials (1963)
    Springer
    Experimental mechanics 3 (1963), S. 148-151 
    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 dynamic values of the modulus of elasticity and photoelastic fringe constant of Homalite 100 and ten epoxy resins were determined. Of those tested, it was found that five exhibited desirable dynamic properties including two materials which exhibited no appreciable change in fringe constant. Included in this group of five materials were three materials which can be purchased in precast shapes; thus, enabling laboratories without casting facilities to obtain suitable materials for dynamic photoelastic experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02327230
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Stress concentrations due to sharp notches (1967)
    Springer
    Experimental mechanics 7 (1967), S. 513-517 
    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 A photoelastic technique has been developed to determine accurately the fringe order of a sharp notch, i.e., as small as 0.0019 in. in radius, to within ±0.0004 in. of the boundary. The stress is frozen into the specimen, enabling careful study of the specimen. Experimental results are discussed and compared to values obtained from some existing theoretical solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02326326
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Interpretation of fringes in stress-holo-interferometry (1971)
    Springer
    Experimental mechanics 11 (1971), S. 161-166 
    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 Previous studies had concluded that stressholo-interferometry patterns consist of the independent superposition of the isopachic family (with half-order fringe shifts) and the isochromatic family. It is shown here that this interpretation is not always valid and can result in serious errors in some cases. In particular, it is demonstrated that the position, and even the existence of the fringes, are affected by the interaction of the isopachics and isochromatics. This effect is most pronounced when the two families of fringes are nearly parallel and of approximately the same spatial frequency. The independent superposition interpretation is most accurate when the two families of fringes are orthogonal, whatever the ratio of spatial frequencies might be. These properties are illustrated using computer-generated holographic interference patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02324907
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Classification of stress-intensity factors from isochromatic-fringe patterns (1979)
    Springer
    Experimental mechanics 19 (1979), S. 175-175 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02324262
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    On the role of material and optical properties in complete photoelastic analysis (1976)
    Springer
    Experimental mechanics 16 (1976), S. 441-447 
    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 Consideration of the laws of elasticity and optics allows the classification of photoelastic materials into several categories. Two types of photoelastic materials are studied experimentally in compressible and incompressible forms to decide in which category they belong. Two epoxies and three polyurethane rubbers are reported. Both epoxies were calibrated for their response to frozen stress, and one under live load. The rubbers were all calibrated under live load at ambient temperature. The results support an earlier hypothesis that the photoelastic response of incompressible materials is strain sensitive and cannot be used directly in the general three-dimensional case to determine normal stress without additional data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02324100
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Stress analysis of a complex part: Photoelasticity vs. finite elements (1977)
    Springer
    Experimental mechanics 17 (1977), S. 441-448 
    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 A newly developed interactive finite-element package and conventional three-dimensional photoelasticity were used in parallel to analyze the stresses in a complex part. Contrary to most similar case studies, the geometry did not favor either method, and results from one method were at times used to assist in the implementation of the other. As a result of this study, it was concluded that the combined use of numerical and experimental methods provides more information about the part being analyzed than does either method taken alone. When applied in this sense, a highly user-oriented numerical-analysis package can be an ally rather than a rival to the efforts of the experienced experimental analyst.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02324666
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    A holographic method for matching and measuring the refractive index of a photoelastic material (1978)
    Springer
    Experimental mechanics 18 (1978), S. 112-114 
    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 If a wedge-shaped sample of material is immersed in a tank of fluid and a coherent beam of light passed through it, the ensuing wavefront can be made to interfere with a holographically stored wavefront produced with the wedge removed. The interference is measured by the resulting fringes, which can be reduced by varying the fluid mix until the fluid matches the index of refraction of the material. The number of fringes can also be used to determine the difference between the indices of refraction of the fluid and material, and determine the material index from a known fluid index.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02325006
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    Paper (German National Licenses)
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