Article
Materials Science, Multidisciplinary
Wei Liu, Yonggang Hao
Summary: A nonlinear damage model was established to accurately predict the damage and fracture behaviors of a 7075 aluminum alloy during cryogenic stamping. Experimental results showed a significant improvement in failure strain at -196 degrees Celsius, with lower damage values for cryogenic deformed specimens compared to room temperature. There was good agreement between experimental and simulation results.
MECHANICS OF MATERIALS
(2021)
Article
Automation & Control Systems
Jing Zhou, Xiaoming Yang, Baoyu Wang, Wenchao Xiao
Summary: This paper investigates the springback behavior of high strength aluminum alloy 7075 through experiments and finite element simulation. The study concludes that springback angles are directly proportional to punch radius, influenced by deformation temperature and blank holder force, with stress relaxation being the primary reason for reducing springback.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Hongbin Yang, Mengnie Li, Hengyong Bu, Xin Lu, Hongmei Yang, Zhuo Qian
Summary: In this study, an ANN model was used to analyze the deformation behavior and construct a valid constitutive relationship for as-rolled 7075 aluminum alloy. The results showed that the ANN model had a high prediction accuracy for flow stress. It was also found that the effective strain distribution in the hot-compressed specimens was non-uniform and influenced by deformation parameters.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Metallurgy & Metallurgical Engineering
Hui-cheng Geng, Yi-lin Wang, Bin Zhu, Zi-jian Wang, Yi-sheng Zhang
Summary: The effect of solution treatment time on the post-formed plasticity and ductile fracture of 7075 aluminum alloy in the hot stamping process was investigated. Experimental and simulation results showed that there was no significant impact of extending the solution treatment time on the material anisotropy, but a longer solution treatment time could increase the fracture strain of the aluminum alloy during the hot stamping process.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Optics
Guixin Yuan, Zhukun Zhou, Xiang Li, Yu Long
Summary: This study investigates the application of blue laser welding and fiber laser oscillation welding on aluminum alloy and CFRP-PEEK materials. The results show that the blue laser welded joint has higher strength and lower residual stress compared to the fiber laser welded joint, which is affected by bubble defects and temperature differences causing stress concentration.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Xiangji Li, Xu Yan, Zhiqiang Zhang, Mingwen Ren, Hongjie Jia
Summary: Research shows that using different lubricants can improve the quality of aluminum alloy hot stamped parts, with molybdenum disulfide lubricant showing better performance. The friction coefficients under different lubrication conditions can be accurately obtained using the inverse problem optimization method.
Article
Automation & Control Systems
Changqing Huang, Zanshi Deng, Xiaohui Cui, Zhihao Du
Summary: This paper introduces a novel forming method, electromagnetic hot forming, to solve the problem of fracture during conventional forming processes of 7075 aluminum alloy. The effectiveness of this method is studied by comparing different methods and analyzing the sheet deformation process. Consistent conclusions are obtained through the comparison of experimental and simulation results.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Zhihao Du, Zanshi Deng, Xiaohui Cui, Ang Xiao
Summary: Experimental research on the electromagnetic hot forming of 7075-T6 aluminum alloy found that with the increase in temperature, the material's deformation behavior changes, with the forming height being optimal at 400 degrees Celsius, showing improved forming performance.
Article
Materials Science, Multidisciplinary
H. T. Jeong, H. K. Kim, W. J. Kim
Summary: A series of isothermal compression tests were conducted on cast 7075 alloy processed by the electromagnetic stirring method. Processing maps were constructed using different methods and integrated into plastic forming process with FE simulation software. The ease of calculation for KJ method in predicting power dissipation efficiency and unstable flow conditions during hot compression was highlighted in comparison to Prasad and Murty methods.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Automation & Control Systems
Ping Zhang, Yeran Gao, Shunxiang Wang, Zehua Liu, Zhenyong Lin, Songting Zhang, Xiujie Yue
Summary: The effect of T6I4 and T6I6 on the machinability of 7075 aluminum alloy was investigated. The cutting force, cutting temperature, surface roughness, and tool wear variations were examined using various methods. The results showed that T6I4 and T6I6 significantly improved the machinability of the alloy, with 7075-T6I4 exhibiting the best performance. Increasing cutting speed and reducing feed rate improved the surface finish of the workpiece.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Chemistry, Physical
Takayuki Shiraiwa, Fabien Briffod, Manabu Enoki
Summary: A method for predicting fatigue crack initiation of the 7075 aluminum alloy by crystal plasticity finite element analysis considering microstructures was proposed in this study. The calculated crack initiation life and morphology were in good agreement with the experimental results, indicating the effectiveness of the proposed method in predicting fatigue crack initiation in aluminum alloys.
Article
Engineering, Civil
Ziqin Yan, Ang Xiao, Xiaohui Cui, Yuhong Lin, Hailiang Yu, Baoguo Chen
Summary: This study investigated the electromagnetic forming process of 7075-T6 aluminum alloy and compared it with quasi-static stamping. Through finite element models and the Johnson-Cook model, it was found that the fracture energy of electromagnetic forming is three times that of traditional stamping, and high strain rate is the main factor affecting the material's fracture strain.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Heyuan Wang, Xiaolong Sui, Yingping Guan
Summary: By conducting high-temperature tensile tests and finite element simulations, the Johnson-Cook ductile fracture model and theoretical forming limit curves of AA7075 aluminum alloy sheets were constructed, and the reliability of the model was verified.
Article
Materials Science, Multidisciplinary
Linlin Liu, Guoqun Zhao, Guangchun Wang, Xinwu Ma, Zhaohui Yan, Shanpeng Cao
Summary: Hot compression tests were conducted on 7055 aluminum alloy under different conditions, and the microstructure and deformation behavior were analyzed. The results showed that the softening mechanism of the alloy was mainly attributed to recovery and partial recrystallization. The combined effects of strain rate and temperature on recrystallization behavior were revealed using the Zener-Holloman parameter.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Lingling Yi, Ge Yu, Ziming Tang, Xin Li, Zhengwei Gu
Summary: In this study, the high-temperature mechanical properties of 5083 aluminum alloy were investigated under different temperature and strain rate conditions using uniaxial tensile tests. The forming process of the high-speed train skin was simulated using the finite element software PAM-STAMP, and the effects of forming method and process parameters on the minimum thickness and springback were analyzed using the Response Surface Methodology. The forming experiment verified the simulation results, with the test part meeting the quality requirements. The mechanical properties of the sheet before and after the HFQ process were examined, showing an increase in yield strength but a decrease in elongation.
