Christmann, Julia; Müller, Ralf; Webber, Kyle G; Isaia, Daniel; Schader, Florian H; Kipfstuhl, Sepp; Freitag, Johannes; Humbert, Angelika (2014): Measurements of fracture toughness applying a four-point-bending technique of ice core B34 from Kohnen Station, Dronning Maud Land, Antarctica. PANGAEA, https://doi.org/10.1594/PANGAEA.835321, Supplement to: Christmann, J et al. (2015): Measurement of the fracture toughness of polycrystalline bubbly ice from an Antarctic ice core. Earth System Science Data, 7(1), 87-92, https://doi.org/10.5194/essd-7-87-2015
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The critical fracture toughness is a material parameter describing the resistance of a cracked body to further crack extension. It is an important parameter to simulate and predict the break-up behaviour of ice shelves from calving of single icebergs to the disintegration of entire ice shelves over a wide range of length scales. The fracture toughness values are calculated with equations that are derived from an elastic stress analysis. Additionally, an X-ray computer tomography (CT scanner) was used to identify the density as a function of depth. The critical fracture toughness of 91 Antarctic inland ice samples with densities between 840 to 870 kg/m**3 has been determined by applying a four-point-bending technique on single edge v-notched beam samples. The examined ice core was drilled 70m north of Kohnen Station, Dronnning Maud Land (75°00' S, 00°04' E, 2882 m).
Latitude: -75.000780 * Longitude: 0.066910
Date/Time Start: 2014-01-18T00:00:00 * Date/Time End: 2014-01-18T00:00:00
Minimum DEPTH, ice/snow: 94.6933 m * Maximum DEPTH, ice/snow: 95.8636 m
B34 * Latitude: -75.000780 * Longitude: 0.066910 * Date/Time: 2014-01-18T00:00:00 * Elevation Start: 2882.0 m * Elevation End: 2892.0 m * Recovery: 201 m * Location: Dronning Maud Land, Antarctica * Campaign: EPICA-Campaigns * Basis: Kohnen Station * Method/Device: Ice drill (ICEDRILL) * Comment: Elevation end based on WGS84
Method of measurements of fracture toughness follows ASTM C1421-01b: Standard test methods for determination of fracture toughness of advanced ceramics at ambient temperature (http://www.astm.org/DATABASE.CART/HISTORICAL/C1421-01B.htm) and ASTM E1820-08: Standard test methods for measurement of fracture toughness (http://www.astm.org/DATABASE.CART/HISTORICAL/E1820-08.htm).
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