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- W2007507165 abstract "Abstract This work describes a mechanism for the initiation of delamination cracks in Al–Li alloys based on the soft/stiff character of adjacent grains. Small-scale-yielding, crystal plasticity simulations of divider grain configurations (L-T) reveal an elevated mean stress on grain boundaries. This mean stress increase drives a sharp localization of the Rice-Tracey parameter to the grain boundaries – elevation of the RT parameter indicates favorable conditions for void growth and triggering of delamination cracking, in agreement with the fractography of Ritchie and co-workers. Our simulation results and available experimental evidence indicate delamination initiates typically between soft/stiff grain pairs, often Bs (Bunge-convention Euler angles ϕ 1 = 131 ° , Φ = 83 ° , ϕ 2 = 307 ° ) or S ( ϕ 1 = 233 ° , Φ = 151 ° , ϕ 2 = 105 ° ) orientations. The crystal plasticity results and a simple model of a soft/stiff material interface show that mean stress accumulation is a consequence of the mechanics of such an interface, and not necessarily tied to material inhomogeneities near the GBs (such as precipitate free zones)." @default.
- W2007507165 created "2016-06-24" @default.
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- W2007507165 date "2015-01-01" @default.
- W2007507165 modified "2023-09-29" @default.
- W2007507165 title "An interface compatibility/equilibrium mechanism for delamination fracture in aluminum–lithium alloys" @default.
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- W2007507165 doi "https://doi.org/10.1016/j.engfracmech.2014.11.003" @default.
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