The residual stress characteristics and mechanical behavior of shot peened fiber metal laminates based on the aluminium-lithium alloy

The residual stress characteristics and mechanical behavior of shot peened fiber metal laminates based on the aluminium-lithium alloy

Li, H. (TU Delft Structural Integrity & Composites; Nanjing Institute of Technology)
Wang, Hao (Nanjing University of Aeronautics and Astronautics)
Alderliesten, R.C. (TU Delft Structural Integrity & Composites)
Xiang, Junxian (Nanjing University of Aeronautics and Astronautics)
Lin, Yanyan (Nanjing University of Aeronautics and Astronautics)
Xu, Yingmei (Nanjing University of Aeronautics and Astronautics)
Zhao, Haidan (Nanjing Institute of Technology)
Tao, Jie (Nanjing University of Aeronautics and Astronautics)

2020

The effect of shot peen forming on the mechanical behavior of fiber metal laminates (FMLs) based on aluminium-lithium alloy was investigated to reveal the strengthening mechanism and to dispel the suspicion that shot peen forming may result in the performance deterioration of FMLs. The interlaminar, static strength and fatigue properties of shot peened FMLs were investigated. The residual stress characteristics of the shot peened FMLs was also involved with finite element analysis to help understanding the unique mechanical behavior. The results indicated that shot peening caused non-negligible work hardening in external metal layers, which increased the tensile strength of the laminates. But the work hardening did not deteriorate the elongations of FMLs since the failure still dominated by the limitation of fiber failure strain. Moreover, two yield stages were observed in the tensile tests of shot peened FMLs owing to the great difference in stress states between external and internal metal layers. The compressive stress introduced by shot peening effectively improved the FCG properties of FMLs. All metal layers possessed similar crack propagation rates despite that the stress difference was up to 300 MPa, which indicated that the fiber bridging effect still dominated the FCG of FMLs.

Aluminum-lithium alloy
Fiber metal laminates
Mechanical behavior
Residual stress
Shot peen forming

http://resolver.tudelft.nl/uuid:fa43da13-6ee9-4a83-9060-8ec4a634e7fb

https://doi.org/10.1016/j.compstruct.2020.112858

2021-06-04

0263-8223

Composite Structures, 254

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2020 H. Li, Hao Wang, R.C. Alderliesten, Junxian Xiang, Yanyan Lin, Yingmei Xu, Haidan Zhao, Jie Tao