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  • 1965-1969  (2)
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  • 1965-1969  (2)
Year
  • 1
    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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  • 2
    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
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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