On estimating the fracture stress and elongation of Al–7%Si–0.3%Mg alloy castings with single pores

Abstract

An elastic–plastic fracture-mechanics approach was followed to estimate the fracture stress of Al–7%Si–0.3%Mg alloy castings as a function of size and shape of pores in castings, by using a combination of load limit and linear elastic fracture mechanics. Estimated elongation was then calculated from estimated fracture stress values by using the Voce equation for true stress-strain relationship and the Kocks–Mecking work hardening model. Estimated fracture stress and elongation values compared well with experimental findings of Surappa et al. [Scripta Metall. 20 (1986) 1281]. The methodology and results are discussed in the paper.