Numerical Characterization of the Pores and the Determination of the Point Of Crack Initiation in Some Cast Aluminum Alloys
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2013, Vol 3, Issue 2
Abstract
Abstract: Porosity is a major defect in cast aluminum alloys affecting in particular, the fatigue strength. In this work, fractal analysis of the pores in the microstructure of cast aluminum alloys were done to provide information linking their composition and processing to the crack initiation. Two cast alloys: Al – 20%wtSi and Al – 20%wtCu, were used and the types of pores were studied in the as-cast samples. The shapes of the pores along with the percentage porosity in each of the microstructures were also evaluated. The Multi-Stage Random Sampling (MRS) and Spatial Point Pattern (SPP) Methods were used to determine the distribution of the pores and the point of crack initiation. Fractal analysis showed that all the pores were shrinkage pores with β<0.3 and D approaching 2. The MRS and SPP methods revealed that crack initiation for eventual failure will start in the worst pore found in the lower right region of as-cast Al-20%wtSi because it has the value of D= 1.2846 and lowest sphericity β =0.0011. This work has shown the effectiveness of using the fractal analysis, the MRS and the SPP methods for the characterization of the pores in the microstructure of cast aluminium alloys.
Authors and Affiliations
Durowoju, M. O
Keywords
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