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On the evaluation of the stress intensity factor in calving models using linear elastic fracture mechanics

JIMÉNEZ, STEPHEN ; DUDDU, RAVINDRA

Journal of glaciology, 2018-10, Vol.64 (247), p.759-770 [Periódico revisado por pares]

Cambridge, UK: Cambridge University Press

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Título:
On the evaluation of the stress intensity factor in calving models using linear elastic fracture mechanics
Autor: JIMÉNEZ, STEPHEN ; DUDDU, RAVINDRA
Assuntos: Boundary conditions ; Computer simulation ; Correlation ; Crack propagation ; Crevasses ; Displacement ; Edge cracks ; Energy ; Evaluation ; Finite element analysis ; Finite element method ; Floating ice ; Formulations ; Fracture mechanics ; Fracture toughness ; glacier calving ; Glaciers ; Ice ; Ice calving ; Ice shelves ; ice-sheet modelling ; iceberg calving ; Land ice ; Linear elastic fracture mechanics ; Mathematical analysis ; Mathematical models ; Mechanics ; Numerical prediction ; Propagation ; Sea level ; Slabs ; Stress concentration ; Stress intensity factors ; Tips ; Weight ; Weighting functions
É parte de: Journal of glaciology, 2018-10, Vol.64 (247), p.759-770
Descrição: We investigate the appropriateness of calving or crevasse models from the literature using linear elastic fracture mechanics (LEFM). To this end, we compare LEFM model-predicted stress intensity factors (SIFs) against numerically computed SIFs using the displacement correlation method in conjunction with the finite element method. We present several benchmark simulations wherein we calculate the SIF at the tips of water-filled surface and basal crevasses penetrating through rectangular ice slabs under different boundary conditions, including grounded and floating conditions. Our simulation results indicate that the basal boundary condition significantly influences the SIF at the crevasse tips. We find that the existing calving models using LEFM are not generally accurate for evaluating SIFs in grounded glaciers or floating ice shelves. We also illustrate that using the ‘single edge crack’ weight function in the LEFM formulations may be appropriate for predicting calving from floating ice shelves, owing to the low fracture toughness of ice; whereas, using the ‘double edge crack’ or ‘central through crack’ weight functions is more appropriate for predicting calving from grounded glaciers. To conclude, we recommend using the displacement correlation method for SIF evaluation in real glaciers and ice shelves with complex geometries and boundary conditions.
Editor: Cambridge, UK: Cambridge University Press
Idioma: Inglês

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On the evaluation of the stress intensity factor in calving models using linear elastic fracture mechanics

JIMÉNEZ, STEPHEN ; DUDDU, RAVINDRA

Cambridge, UK: Cambridge University Press

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