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Fracture mechanism of a laminated aluminum alloy plate during ballistic impact

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Abstract

The multilayered 7XXX series aluminum alloy was impacted by 7.62 mm ogival projectiles at velocities ranging from 787 to 851 m·s−1. The deformed microstructure under various impacting velocities and fracture surfaces of different sections were investigated at different physical scales to determine the process of failure. Optical microscopy (OM), electron back-scattered diffraction (EBSD) and scanning electron microscopy (SEM) were used in the investigation. The results show that crater is constrained in the 7B52 front layer and two types of adiabatic shear bands which are transformed bands and deformed bands and different types of cracks are observed. Spall fracture is the significant failure mode of 7B52 front layer, and the resulting delamination leads to the presence of bending tensile fracture instead of the shear plugging. The ductile 7A01 layer blunts and deflects the spall crack tips, preventing the targets from full spall, and induces a constraint of 7A52 rear layer. The level of the constraint determines different fracture modes of 7A52 layer, accounting for the asymmetry of damage.

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Acknowledgments

This study was financially supported by the National Basic Research Program of China (No. 2012CB619504) and the National Natural Science Foundation of China (No. 51274046).

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Authors and Affiliations

  1. State Key Laboratory of Nonferrous Metals and Processes, General Research Institute for Nonferrous Metals, Beijing, 100088, China

    Ming-Yuan Li, Bai-Qing Xiong, Xi-Wu Li, Shu-Hui Huang, Zhi-Hui Li & Yong-An Zhang

  2. Northeast Light Alloy Co., Ltd., Harbin, 150060, China

    Guo-Jun Wang & You-Zhi Tong

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  1. Ming-Yuan Li
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Correspondence to Bai-Qing Xiong.

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Li, MY., Xiong, BQ., Wang, GJ. et al. Fracture mechanism of a laminated aluminum alloy plate during ballistic impact. Rare Met. 36, 737–745 (2017). https://doi.org/10.1007/s12598-015-0684-1

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  • DOI: https://doi.org/10.1007/s12598-015-0684-1

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