Measurement of fracture toughness of polycrystalline bubbly ice from an Antarctic ice core

• Published in: Earth System Science Data
• Main Authors: Christmann, Julia, Müller, Ralf, Webber, K.G., Isaia, D, Schader, F.H., Kipfstuhl, Sepp, Freitag, Johannes, Humbert, Angelika
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Copernicus Publications 2015
• Subjects: Antarctic; Kohnen; Kohnen Station; Antarc*; ice core; Ice Shelves; Iceberg*
• Online Access: https://epic.awi.de/id/eprint/42233/; https://epic.awi.de/id/eprint/42233/1/essd-7-87-2015.pdf; https://hdl.handle.net/10013/epic.48956; https://hdl.handle.net/10013/epic.48956.d001

The critical fracture toughness is a material parameter describing the resistance of a cracked body to further crack extension. It is an important parameter for simulating and predicting the breakup behavior of ice shelves from the 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 bubbly ice samples with densities between 840 and 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 70 m north of Kohnen Station, Dronnning Maud Land (75◦00′ S, 00◦04′ E; 2882 m).