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Quasi-static and dynamic crack growth along bimaterial interfaces: A note on crack-tip field measurements using coherent gradient sensing

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Abstract

The paper presents a preliminary experimental investigation of crack-tip deformation fields near quasistatically and dynamically growing cracks in bimaterial interfaces. A three-point-bend bimaterial specimen with a relatively large stiffness mismatch between the two materials is studied. A recently developed optical method of coherent gradient sensing (CGS) is used to map crack-tip deformation fields.

The quasi-static measurements are interpreted using plane-stress, singular-field solution for the interface crack tip. Results are compared with two-dimensional finite-element computations performed on identical specimen geometries and material mismatch.32 Impact studies conducted with bimaterial specimens provide the first experimental results of deformation fields near dynamically growing cracks along interfaces. Very high crack velocities, up to 80 percent of the Rayleigh wave speed for the less stiffer material of the two, are observed.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Auburn University, 201 Ross Hall, 36849, Auburn, AL

    H. V. Tippur (Assistant Professor)

  2. Department of Aeronautics and Applied Mechanics, California Institute of Technology, 105-50, 91125, Pasadena, CA

    A. J. Rosakis (Associate Professor)

Authors
  1. H. V. Tippur
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  2. A. J. Rosakis
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Tippur, H.V., Rosakis, A.J. Quasi-static and dynamic crack growth along bimaterial interfaces: A note on crack-tip field measurements using coherent gradient sensing. Experimental Mechanics 31, 243–251 (1991). https://doi.org/10.1007/BF02326067

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  • DOI: https://doi.org/10.1007/BF02326067

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