Improving fatigue crack growth resistance through local internal stresses of high strength aluminum alloys reinforced by shape memory alloy
(2022) 18th European Mechanics of Materials Conference (EMMC18) — Location: Oxford, UK (4.April.2022)
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- Authors
Gomes Affonseca Netto, Nelson 
Hannard, Florent 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
Department of Mechanics, School of Aerospace Engineering, Huazhong University of Science and Technology, Wuhan, China Ecole Polytechnique, Palaiseau - Laboratoire de Mécanique des Solides
Citations
Gomes Affonseca Netto, N., Hannard, F., Zhao, L., Charkaluk, E., & Simar, A. (2022). Improving fatigue crack growth resistance through local internal stresses of high strength aluminum alloys reinforced by shape memory alloy. 18th European Mechanics of Materials Conference (EMMC18), Oxford, UK. https://hdl.handle.net/2078.5/107477