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An empirical model for estimating fracture toughness using the DCDC geometry

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Abstract

The double cleavage drilled compression (DCDC) geometry is useful for creating large cracks in a material in a controlled manner. Several models for estimating fracture toughness from DCDC measurements have been proposed, but each is suitable for a subset of geometries and material properties. In this work, a series of finite element fracture simulations are performed over a range of sample widths, hole sizes, heights, Young’s moduli, Poisson’s ratios, critical stress intensity factors, and boundary conditions. Analyzing the simulation results, fracture toughness is found to be a simple function of sample width, hole size, and an extrapolated stress at zero crack length obtained from a linear fit of the data. Experimental results in the literature are found to agree with this simple relationship.

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Acknowledgments

This work was funded by Air Force Office of Scientific Research Grant FA9550-08-1-0314 to UC San Diego.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0416, USA

    Christian Nielsen & Sia Nemat-Nasser

  2. Department of Mechanical Engineering, University of Massachusetts at Lowell, 1 University Avenue, Lowell, MA, 01854, USA

    Alireza V. Amirkhizi

Authors
  1. Christian Nielsen
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  2. Alireza V. Amirkhizi
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  3. Sia Nemat-Nasser
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Correspondence to Christian Nielsen.

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Nielsen, C., Amirkhizi, A.V. & Nemat-Nasser, S. An empirical model for estimating fracture toughness using the DCDC geometry. Int J Fract 188, 113–118 (2014). https://doi.org/10.1007/s10704-014-9945-5

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  • DOI: https://doi.org/10.1007/s10704-014-9945-5

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