Fracture Mechanical Analysis of Failure Processes in Antarctic Ice Shelves

• Main Author: Plate, Carolin
• Format: Doctoral or Postdoctoral Thesis
• Language: English
• Published: 2015
• Subjects: fracture mechanics; finite element method; configurational forces; ice shelves; ddc:620; Antarctic; Wilkins; Wilkins Ice Shelf; Antarc*; Ice Shelf; Ice Shelves
• Online Access: https://kluedo.ub.rptu.de/frontdoor/index/index/docId/4236; https://nbn-resolving.org/urn:nbn:de:hbz:386-kluedo-42367; https://kluedo.ub.rptu.de/files/4236/Dissertation_Carolin_Plate_2015.pdf

This thesis treats the application of configurational forces for the evaluation of fracture processes in Antarctic ice shelves. FE simulations are used to analyze the influence of geometric scales, material parameters and boundary conditions on single surface cracks. A break-up event at the Wilkins Ice Shelf that coincided with a major temperature drop motivates the consideration of frost wedging as a mechanism for ice shelf disintegration. An algorithm for the evaluation of the crack propagation direction is used to analyze the horizontal growth of rifts. Using equilibrium considerations for a viscoelastic fluid, a method is introduced to compute viscous volume forces from measured velocity fields as loads for a linear elastic fracture mechanical analysis.