Author(s): John P. Dempsey; Zonglei Mu; David M. Cole
Linked Author(s): John Dempsey
Keywords: No Keywords
Abstract: The breakup of sea ice in McMurdo Sound has been studied during two field trips in the fall of 2000 and 2001 via in-situ cyclic loading and fracture experiments. In Cole et al. (2002), the motivation, test site, experimental setup, cyclic response and associated acoustic emission for the 5 ×5 m2 test specimen A2-SP2 were presented. In Dempsey et al. (2003), the fictitious crack model, which makes uses of the stress-separation curve, was used to incorporate a process zone into the fracture analysis. The cracking behavior observed and measured on A2-SP2, during both the cyclic loading and the displacement controlled ramp to tensile fracture was examined. Preliminary estimates of the fracture energy were provided. In this paper, stress-separation curves for the A2-SP2 experiment are constructed such that the response computed using the fictitious crack model matches the experimental results. A bilinear stress-separation curve is back-calculated for first-year Antarctic sea ice. The changing shape of the stress separation curve during crack growth is studied. It is hypothesized that this change is reflective of a multiple crack path competitive process.
Year: 2004