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Scale effects on the in-situ tensile strength and fracture of ice. Part II: First-year sea ice at Resolute, N.W.T

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Book cover Fracture Scaling

Abstract

A set of lab- to structural-scale (0.5 < L < 80 m) in-situ full thickness (1.8 m) fracture tests were conducted on first-year sea ice at Resolute, N.W.T. using self-similar (plan view) edge-cracked square plates. With a size range of 1:160, the data is used, via size effect analyses, to evaluate the influence of scale effects on the fracture behavior of sea ice over the range 10-1 m (laboratory) to 100 m and to predict the scale effect on tensile strength up to ≈ 1000 m. Details of this large-scale sea ice fracture test program are presented in this paper. The experimental results are presented as well as the fracture modeling of the data. The influence of scale on the ice strength and fracture toughness is dramatic. The applicability of various size effect laws are investigated and criteria for LEFM test sizes are presented. For the thick first-year sea ice tested, the size-independent fracture toughness is of order 250 kPa√m, not the 115 kPa√m that is commonly used. The number of grains spanned by the associated test piece is 200, much larger than the number 15 typically quoted for regular tension-compression testing. The size-independent fracture energy is 15 J/m2, while the requisite LEFM test size for the edge-cracked square plate geometry (for loading durations of less than 600 s and an average grain size of 1.5 cm), is 3 m square. Size effect analyses of sub-ranges of the data show that unless the specimen sizes tested are themselves sufficiently large, the true nature of the scale effect is not revealed, which was a concern raised by Leicester 25 years ago. In the case of the fracture tests reported in this paper, based on the lab-scale and field-scale strength data measured between 0.1 and 3 m and using Bažant’s size effect law, it is possible to accurately predict the tensile strengths for all of the remaining tests, up to and including 80 m.

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Authors and Affiliations

  1. Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, CB2 1PZ, UK

    J. P. Dempsey

  2. Clough, Harbour and Associates LLP, 571 South Lake Boulevard, Suite B, Richmond, VA, 23236, USA

    R. M. Adamson (Engineers, Surveyors, Planners and Landscape Architects)

  3. Hibbitt, Karlsson and Sorensen Inc., 1080 Main Street, Pawtucket, RI, 02860-4847, USA

    S. V. Mulmule

  4. Department of Civil and Environmental Engineering, Clarkson University, Potsdam, NY, 13699-5710, USA

    J. P. Dempsey

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  1. J. P. Dempsey
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  2. R. M. Adamson
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  3. S. V. Mulmule
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Editors and Affiliations

  1. Department of Civil Engineering, Northwestern University, Evanston, Illinois, USA

    Zdeněk P. Bažant

  2. Office of Naval Research, Arlington, Virginia, USA

    Yapa D. S. Rajapakse

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Dempsey, J.P., Adamson, R.M., Mulmule, S.V. (1999). Scale effects on the in-situ tensile strength and fracture of ice. Part II: First-year sea ice at Resolute, N.W.T. In: Bažant, Z.P., Rajapakse, Y.D.S. (eds) Fracture Scaling. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4659-3_19

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  • DOI: https://doi.org/10.1007/978-94-011-4659-3_19

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