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Quantitative evaluation of fatigue life of cast aluminium alloys by non-destructive testing and parameter model

: Tijani, Y.; Hanselka, H.; Heinrietz, A.; Bruder, T.

American Ceramic Society -ACerS-, Westerville/Ohio; Association for Iron & Steel Technology -AIST-:
Materials Science & Technology Conference and Exhibition 2011, MS&T 11. Vol.1 : Columbus, Ohio, USA 16 - 20 October 2011
Red Hook, NY: Curran, 2011
ISBN: 978-1-618-39261-9
Materials Science & Technology Conference and Exhibition (MS&T) <2011, Columbus>
Conference Paper
Fraunhofer LBF ()

The presence of production-related defects in cast aluminium alloy components leads to reduction in their fatigue strength. The optimal use of their high strength-to-weight benefits is thereby restricted. There is currently only qualitative approach relating the defects characteristics to fatigue analysis. This work presents a method to quantitatively evaluate the fatigue life of defect-prone cast aluminium alloys. The investigation is carried-out by non-destructive analysis of cast aluminium alloy samples using X-Ray computed tomography. The microstructure discontinuities are characterized and quantified in terms of defect size, morphology and distance to specimen surface. These are subsequently used as input in a new parameter model for fatigue life calculation. The results correlate with fatigue experiments and finite-element calculations. This approach provides the possibility to extensively evaluate the fatigue properties of cast aluminium alloy components based on non-destructive test methods. It guarantees an improvement of control mechanisms within the scope of quality assurance.