A moving cohesive interface model for fracture in creeping materials |
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Authors: | F L Carranza B Fang R B Haber |
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Affiliation: | (1) Department of Theoretical and Applied Mechanics, University of Illinois at Urbana-Champaign, Urbana, Illinois, USA, US |
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Abstract: | We present a new cohesive interface model for quasi-static creep crack growth that is implemented within a moving-grid finite
element model. A pseudo crack tip separates the cohesive process zone from the free surfaces of the crack. The moving-grid
formulation models continuous crack advance by describing relative motion between the pseudo crack tip and the material. This
eliminates the need for extensive mesh refinement away from the current crack-tip location and supports both transient and
direct steady-state solutions. A traction-separation law determines the energetic properties of the decohesion process and
generates a simple criterion for crack advance. The new formulation remedies a problem in earlier models which permit a crack
to heal on unloading. Numerical examples demonstrate the moving cohesive interface model in studies of steady-state crack
growth. Adaptive grid refinement is used to control the accuracy of the solution. |
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