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On the determination of the å-K relationship for birefringent polymers

Procedures for determining the å-K relationship from isochromatic-fringe loops are discussed. A correction factor to account for dynamic effects due to crack velocity is introduced

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Abstract

Methods of utilizing dynamic photoelasticity with fracture-type specimens to simultaneously determine the stress-intensity factorK Iand the crack-tip velocity are reviewed. Problems associated with data analysis to obtainK Ifrom isochromatic-fringe loops are discussed. Errors resulting from the use of static near-field equations in the method of analysis are considered and a correction method is developed. Finally, the invariance ofK Im(the minimumK required to maintain a finite crack velocity) is noted and evidence is provided to indicate thatK Imcan be treated as a material propertly.

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Author notes

  1. G. R. Irwin (Visiting Professor), J. W. Dally (Professor), T. Kobayashi (Associate Professor), W. L. Fourney (Professor) & M. J. Etheridge (Former Graduate Student)

    Present address: Naval Surface Weapons Center, White Oak, MD

Authors and Affiliations

  1. College of Engineering, Department of Mechanical Engineering, University of Maryland, 20742, College Park, MD

    G. R. Irwin (Visiting Professor), J. W. Dally (Professor), T. Kobayashi (Associate Professor), W. L. Fourney (Professor), M. J. Etheridge (Former Graduate Student) & H. P. Rossmanith (Visiting Assistant Professor)

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  1. G. R. Irwin
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  2. J. W. Dally
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  3. T. Kobayashi
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  4. W. L. Fourney
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  5. M. J. Etheridge
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  6. H. P. Rossmanith
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Irwin, G.R., Dally, J.W., Kobayashi, T. et al. On the determination of the å-K relationship for birefringent polymers. Experimental Mechanics 19, 121–128 (1979). https://doi.org/10.1007/BF02324224

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  • DOI: https://doi.org/10.1007/BF02324224

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