Abstract
In this paper the void growth, coalescence and fracture behavior of aluminium 5052 alloy are studied at different annealing temperature as a function of various void parameters, namely d-factor, δ d-factor, void area fraction ( V a) and L/ W ratio of the voids. The L/ W ratio of the oblate or prolate voids at fracture is correlated with the mechanical properties, microstructure, minor strain at fracture ( ɛ 2), Mohr's circle shear strains, stress, and strain triaxiality factors. The Lode factor ( θ) is determined and correlated with the stress triaxiality factor ( T), which is the ratio of mean stress ( σ m) to effective stress ( σ e). Void area fraction ( V a) is determined and correlated with the strain triaxiality factor ( T o). It is found that the sheets annealed at 350 °C, possesses better formability compared to the other annealing temperatures. This is due to its recrystallized grain structure, lower d-factor, greater void area fraction ( V a) and lower L/ W ratio of void, lesser stress triaxiality factor, accommodating more plastic deformation.
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