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  • 1985-1989  (8)
  • 1980-1984  (8)
Datenquelle
Materialart
Erscheinungszeitraum
Jahr
Schlagwörter
  • 11
    Digitale Medien
    Digitale Medien
    Dynamic crack curving and branching under biaxial loading (1987)
    Springer
    Experimental mechanics 27 (1987), S. 146-153 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A 16-spark-gap camera was used to record the dynamic photoelastic patterns of ten centrally cracked, Homalite-100 specimens which fractured under ten initial biaxial-stress ratios ranging from 3.7 to 0, some of which do not exist in normal fracture specimens. The dynamic photoelastic patterns of curved cracks were used to verify the previously developed dynamic-crack-curving criterion. Cracks which immediately curved upon propagation in three specimens under abnormally high inital biaxial loading were used to verify the static counterpart of the dynamic-crack-curving criterion under these extreme loading conditions. A previously developed dynamic-crack-branching criterion was also verified by four dynamic photoelastic results involving cracks which eventually branched under the lower initial biaxial loading.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02319466
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  • 12
    Digitale Medien
    Digitale Medien
    Crack-tip dynamic isochromatics in the presence of small-scale yielding (1982)
    Springer
    Experimental mechanics 22 (1982), S. 132-138 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A plasticity correction factor for the dynamic stress-intensity factor,K I dyn , associated with a propagating crack tip in the presence of small-scale yielding, is derived from Kanninen's solution for a constant-velocity Yoffe crack with a Dugdale-strip yield zone. Distortions in the otherwise elastic isochromatics surrounding the constant-velocity crack tip are also studied by the use of this model. This plasticity correction factor is then used to evaluateK I dyn from the dynamic isochromatics of a propagating crack in a 3.2-mm-thick polycarbonate wedge-loaded rectangular double-cantilever-beam specimen. The correctedK I dyn is in good agreement with the corresponding values computed by a dynamic, elastic-plastic finite-element code executed in its generation mode.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02325542
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  • 13
    Digitale Medien
    Digitale Medien
    Dynamic crack curving—A photoelastic evaluation (1983)
    Springer
    Experimental mechanics 23 (1983), S. 1-9 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A dynamic-crack-curving criterion, which is valid under pure Mode I or combined Modes I and II loadings and which is based on either the maximum circumferential stress or minimum strain-energy-density factor at a reference distance ofr 0 from the crack tip, is verified with dynamic-photoelastic experiments. Directional stability of a Mode I crack propagation is attained when $$r_o= \frac{1}{{128\pi }}(\frac{{K_r }}{{\sigma _{ox} }})^2 V_o^2 (C,C_1 ,C_2 ) 〉 r_c $$ wherer c =1.3 mm for Homalite-100 used in the dynamic-photoelastic experiments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02328674
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  • 14
    Digitale Medien
    Digitale Medien
    Further studies on dynamic crack branching (1983)
    Springer
    Experimental mechanics 23 (1983), S. 431-437 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The newly derived dynamic-crack-branching criterion with its modifications is verified by the dynamicphotoelastic results of dynamic crack branchings in thinpolycarbonate, single-edged crack-tension specimens. Successful crack branching was observed in four specimens and unsuccessful branching in another. Crack branching consistently occurred when the necessary conditions ofK I =K I b =3.3 MPa $$\sqrt m$$ and the sufficiency condition ofr o =r c =0.75 mm were satisfied simultaneously. In the unsuccessful branching test, the necessary condition was not satisfied sinceK I was always less thanK I b .
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02330060
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  • 15
    Digitale Medien
    Digitale Medien
    Further studies on crack-tip plasticity of rapid tearing (1985)
    Springer
    Experimental mechanics 25 (1985), S. 66-74 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A modified Dugdale model for rapid tearing is reviewed. Further justification of the model is provided by agreements between the measured crack-tip-opening displacement in rapidly tearing polycarbonate specimens and those computed by using the model. The model is then used to determine the residual stresses in an unloaded polycarbonate fracture specimen after crack arrest. The modified Dugdale model is also used to analyze the rapid tearing data of aluminum fracture specimens.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02329128
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  • 16
    Digitale Medien
    Digitale Medien
    Analysis of dynamic mixed-mode isochromatics (1985)
    Springer
    Experimental mechanics 25 (1985), S. 344-353 
    Details
    ISSN: 1741-2765
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The mixed-mode, elastodynamic state of stress in the neighborhood of a constant-velocity crack tip is used to generate numerically unsymmetric isochromatics. Unsymmetry associated with the third-order terms of a mixed-mode stress field, with and without the Mode II singular stress term, is also investigated. In extractingK I from an unsymmetric isochromatic pattern, errors in the Mode I fracture parameters due to the assumed presence ofK II in aK I stress field were found to be significant when data are taken more than 4 mm from the crack tip.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02321332
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