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An experimental and numerical investigation of ductile crack growth characteristics in surface cracked specimens under combined loading

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Abstract

Fracture mechanics tests have been performed in the upper shelf region of a steel on large surface cracked plate (SCT) specimens and on small compact tension (CT) specimens. Some of the SCT specimens were subjected to combined tension and bending in such a way that the loading was strongly non-proportional. Crack growth characteristics were compared between the specimens in order to assess possible influences of geometry and nonproportional loading. The differences observed could unambiguously be reduced to and correlated with differences in constraint. Constraint parameters were evaluated by detailed three-dimensional finite element computations and quantities for growing cracks were interpreted on the basis of deformation theory considerations, in analogy with the commonly used J R-philosophy. It was noted that the initiation of ductile crack growth along a three-dimensional crack front appears to be independent of the degree of local constraint. However, the increase in toughness for a growing crack was markedly affected by the degree of local constraint. Some estimates of the constraints effects regarding stability considerations were also made.

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Authors and Affiliations

  1. Department of Solid Mechanics, Royal Institute of Technology, 100 44, Stockholm, Sweden

    J. Faleskog

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Faleskog, J. An experimental and numerical investigation of ductile crack growth characteristics in surface cracked specimens under combined loading. Int J Fract 68, 99–126 (1994). https://doi.org/10.1007/BF00032462

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  • DOI: https://doi.org/10.1007/BF00032462

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