Abstract
AbstractThe fatigue performance of high strength aluminum alloys used in planes, trains, trucks and automobiles is notoriously poor. Engineers must design around this important limitation to use Al alloys for light-weighting of transportation structures. An alternative concept for microstructure design for improved fatigue strength is demonstrated in this work. Microstructures are designed to exploit the mechanical energy imparted during the initial cycles of fatigue to dynamically heal the inherent weak points in the microstructure. The fatigue life of the highest strength Aluminum alloys is improved by 25x, and the fatigue strength is raised to ~1/2 the tensile strength. The approach embraces the difference between static and dynamic loading and represents a conceptual change in microstructural design for fatigue.
Funder
Australian Research Council (ARC), Grant Reference number
Publisher
Springer Science and Business Media LLC
Subject
General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry
Reference27 articles.
1. Sachdev, A., Mishra, R., Mahato, A. & Alpas, A. Vehicle lightweighting: challenges and opportunities in ICAA13 Pittsburgh (eds Weiland, H., Rollett, A., & Cassada, w.) 609–622 (Springer, New York, 2012).
2. Hirsch, J. Aluminium in innivative light–weight car design. Mater. Trans. 52, 818–824 (2011).
3. Das, S. et al. Vehicle lightweighting energy use impacts in U.S. light-duty vehicle fleet. Sustain. Mater. Technol. 8, 5–13 (2016).
4. Orowan, E. Theory of the fatigue of metals. Proc. R. Soc. Lond. A 171, 79–106 (1939).
5. Suresh, S. Fatigue of Materials 2nd edn (Cambridge University Press, 1998).
Cited by
71 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献