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Materials 2018, 11(6), 977; https://doi.org/10.3390/ma11060977

Ballistic Performance of Nanostructured Metals Toughened by Elliptical Coarse-Grained Inclusions: A Finite Element Study with Failure Analysis

1
School of Mechanical Engineering, Tianjin University, Tianjin 300072, China
2
Tianjin Key Laboratory of Nonlinear Dynamics and Control, Tianjin 300072, China
3
State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, China
4
Jiangsu Testing Center for Quality of Construction Engineering Co., Ltd., Nanjing 210028, China
5
Department of Mechanical and Aerospace Engineering, Rutgers University, New Brunswick, NJ 08903, USA
*
Author to whom correspondence should be addressed.
Received: 4 May 2018 / Revised: 4 June 2018 / Accepted: 5 June 2018 / Published: 8 June 2018
(This article belongs to the Special Issue Deformation, Fatigue and Fracture of Materials)
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Abstract

Bimodal nanostructured (NS) metals, in which the nano-grains or ultrafine grains serve as matrix phase while the coarse grains serve as toughening phase, can synergize the overall strength and ductility to achieve excellent bullet-proof performance. Because of the extrusion process in the fabrication, the coarse-grained (CG) inclusions are elongated in the extrusion direction and elliptical CG inclusions with different aspect ratios form. The shape, distribution, and volume fraction of these elliptical CG inclusions can all have significant influence on the overall ballistic performance. In this study, the strain gradient plasticity model together with the Johnson–Cook failure criterion is employed to investigate the ballistic performance of the bimodal NS Cu with elliptical CG inclusions. Our results show that the ballistic performance can be improved by increasing the aspect ratio of the elliptical CG inclusions. Furthermore, the staggered distribution of the elliptical CG inclusions will decrease the overall ability of the material to resist failure, but it will improve its overall ability to resist deformation. The larger stagger degree of elliptical CG inclusions can weaken their shape effects on the limit displacement. View Full-Text
Keywords: bimodal nanostructured metals; ballistic performance; Johnson-Cook failure criterion; microstructure; elliptical inclusions bimodal nanostructured metals; ballistic performance; Johnson-Cook failure criterion; microstructure; elliptical inclusions
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Guo, X.; Ouyang, Q.; Sun, Y.; Weng, G.J. Ballistic Performance of Nanostructured Metals Toughened by Elliptical Coarse-Grained Inclusions: A Finite Element Study with Failure Analysis. Materials 2018, 11, 977.

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