Fracture Resistance to Cracking in Ice: Initiation and Growthby J. P. Dempsey, Clarkson Univ, Potsdam, NY, USA,
Y. Wei, Clarkson Univ, Potsdam, NY, USA,
S. J. DeFranco, Clarkson Univ, Potsdam, NY, USA,
Abstract: The issue of notch sensitivity and brittleness of the test failure is used to forecast the necessary specimen size for a material property initiation toughness; a methodology is developed suitable for all test geometries. The scatter in the fracture toughness values reported in the literature is partially accounted for by examining the requisite notch acuity or crack tip sharpness. This topic is important for the eventual standardization of fracture testing. The third subject examined is the research to date on crack growth stability. Closely related to this topic are concerns such as: under what conditions (if at all) does a crack in ice remain atomically sharp, and under what conditions will blunting take place? If crack-tip blunting occurs, or if blunting does not occur but fracture re-initiation requires a larger energy release rate, what are the underlying mechanisms, and what are the most applicable concepts of fracture mechanics? Information related to the above issues are of fundamental importance to applications involving the fracture of ice and the fracture of quasi-brittle materials in general.
Subject Headings: Cracking | Material tests | Toughness | Ice | Brittleness | Material failures | Load and resistance factor design
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