Burke-Veliz, Allan, Reed, Philippa A.S. and Syngellakis, Stavros
A numerical study of crack shielding and de?ection under
Engineering Fracture Mechanics, 76, (9), . (doi:10.1016/j.engfracmech.2009.02.003).
Experimentally observed crack de?ection events in multi-layered material systems, occurring even under pure mode-I loading, are here simulated and explained through elasto-plastic ?nite element modelling. The crack tip opening displacement is adopted as the
crack driving force and estimated along crack paths whose de?ection is predicted using the maximum tangential strain criterion. Shielding conditions that promote de?ection and bifurcation are evaluated. It is shown that, under conditions of extended plasticity, CTOD evolution as a crack approaches an interface can reveal crack shielding and ampli?cation, and that crack de?ection and growth can be assessed from the variation of tangential strains around the crack tip.
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