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Characterization of Anisotropic Fracture Behavior of 7075-T6 Aluminum Alloy Sheet under Various Stress States

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Abstract

The anisotropic fracture of the 7075-T6 aluminum alloy sheet was investigated under various stress states. Tensile tests using specimens with various shapes were conducted along different loading directions to understand the anisotropic fracture behavior of the 7075-T6 sheet over a wide range of stress states. The failure strains as a function of loading directions and stress state were evaluated using the digital image correlation (DIC) technique. The fracture morphology was observed at the macroscale and microscopic to probe the failure model and fracture mechanisms of the 7075-T6 aluminum alloy sheet. The anisotropic fracture behavior of the alloy was described using a DF2016-based anisotropic fracture model. Meanwhile, the effect of plastic anisotropy on the formability of the 7075-T6 sheet was examined using both quadratic and non-quadratic yield functions. The constructed anisotropic fracture loci, fracture envelopes, and fracture forming limit diagrams reasonably characterized the anisotropic fracture behavior of the 7075-T6 sheet over a wide range of loading conditions.

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Acknowledgments

The authors are very grateful for the support received from the National Natural Science Foundation of China (Grant No. 51275414, No. 51605387), the National Key Research and Development Program of China (Grant No. 2021YFB3400902), the Fundamental Research Funds for the Central Universities with Grant No. 3102015BJ (II) ZS007, the Research Fund of the State Key Laboratory of Solidification Processing (NWPU), China (Grant No. 130-QP-2015), and the Key Research and Development Program of Shaanxi Province (No. 2020ZDLGY12-07).

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  1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an, 710072, China

    Tianyu Xu, Fuguo Li, Xueli Wang & Guohao Zhang

  2. Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment, Northwestern Polytechnical University, Xi’an, 710072, China

    Fuguo Li

  3. Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, MIIT China, Northwestern Polytechnical University, Xi’an, 710072, China

    Guohao Zhang

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  1. Tianyu Xu
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TX was involved in conceptualization, data curation, investigation, software, visualization, writing—original draft, FL contributed to review and editing, supervision, XW was involved in investigation, data curation, visualization, and GZ contributed to resources.

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Xu, T., Li, F., Wang, X. et al. Characterization of Anisotropic Fracture Behavior of 7075-T6 Aluminum Alloy Sheet under Various Stress States. J. of Materi Eng and Perform 32, 3230–3252 (2023). https://doi.org/10.1007/s11665-022-07327-w

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