Enhancing fatigue crack growth resistance of high strength aluminum alloys reinforced by shape memory alloy
(2022) TMS 2022 — Location: Anaheim, California, USA (27.February.2022)
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- Authors
Gomes Affonseca Netto, Nelson 
Zhao, Lv
- Abstract
- In the framework of metal matrix composites (MMCs), shape memory alloys (SMAs), when serving as reinforcements, provide a possibility to tune cracking mechanisms due to their shape memory effect (SME). The SME is used to introduce local internal stresses in the vicinity of the reinforcements, attracting or repelling the propagating crack, therefore leading to fracture path deviation and enhancing resistance to crack growth. In the present work, nitinol (NiTi) particles were used as particulate reinforcements for Al7075 and the composites have been manufactured via friction stir processing (FSP) to prove the aforementioned concept. According to fatigue crack propagation tests, the Al7075/NiTi composites present lower fatigue crack growth rate compared to the FSPed Al7075 reference material as well as the Al7075/NiTi composites without internal stresses. Digital image correlation (DIC) analysis allows for an understanding of the plasticity and damage mechanism at the crack tip during its propagation.
- Affiliations
Huazhong University of Science and Technology Department of Mechanics, School of Aerospace Engineering Ecole Polytechnique, Palaiseau Laboratoire de Mécanique des Solides
Citations
Gomes Affonseca Netto, N., Zhao, L., Charkaluk, E., & Simar, A. (2022). Enhancing fatigue crack growth resistance of high strength aluminum alloys reinforced by shape memory alloy. TMS 2022, Anaheim, California, USA. https://hdl.handle.net/2078.5/108936