Abstract
The methodology to predict the increase in crack growth resistance due to crack deflection and branching is described. These procedures are discussed with respect to an Al-Li alloy 2090 sheet in T6 condition, the R-curve tests on which revealed that the crack path in L-T orientation was deflected and branched while it remained nominally straight in T-L orientation. The resistance to slow stable crack extension in L-T orientation was found to be significantly higher as compared to that in T-L orientation. Such behaviour is rationalized in terms of crack deflection and branching. The observed variation in the crack path morphology and the resulting R-curves in L-T and T-L orientations can be understood in terms of the microstructural features of the alloy.
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