Article
Chemistry, Physical
Hanji Zhu, Giuseppe Lacidogna, Caiyan Deng, Baoming Gong, Fei Liu
Summary: This study investigated the fatigue crack initiation and growth characteristics in 7050-T7451 aluminum alloy butt joints subjected to different stress ratios and friction stir welding (FSW). The results showed that the presence of coarse secondary phases in FSW joints led to different fatigue crack initiation locations compared to the base material.
Article
Engineering, Manufacturing
Zi Ye, Yong-Guo Wang, Xin Yu
Summary: This study investigated the effect of different cooling conditions on reaming aluminum alloy 7050-T7451, using finite element models to simulate chip formation. It was found that cutting parameters and cooling strategies strongly influenced chip morphology, and that desired chip morphologies and hole quality could be achieved with internal cooling at specific spindle speed and feed rate. This research also demonstrated the feasibility of using an internal cooling strategy to break chips during reaming, offering new possibilities for improving hole machining processes.
ADVANCES IN MANUFACTURING
(2022)
Article
Materials Science, Characterization & Testing
Cagri Ilhan, Riza Gurbuz
Summary: The study investigates the impact of chromic acid anodizing (CAA) surface treatment on the fatigue behavior of 7050 T7451 aluminum alloy. It was found that the fatigue life reduction is caused by the pretreatments of CAA, and the results of fatigue tests differ between bare condition and sub-stages of CAA.
Article
Materials Science, Multidisciplinary
Zhang Ping, Yue Xiujie, Wang Penghao, Yu Xiao
Summary: The cutting parameters significantly affect the surface roughness, work hardening, and residual stress of AA7050-T7451 aluminum alloy. Higher cutting speeds and lower feed rates can improve surface roughness, while cutting depth has little effect on surface roughness. Residual stress is closely related to changing cutting parameters.
Article
Engineering, Mechanical
D. A. Wragg, D. P. Davies, S. L. Jenkins
Summary: The aim of this study was to investigate the effect of two commonly used anodising processes, Chromic acid anodising (CAA) and Sulphuric acid anodising (SAA), on the fatigue life of 7050-T7451 (AMS4050). The results showed that both anodising processes reduced fatigue compared to the as machined condition, but the mechanisms differed. The reduction in fatigue for CAA was due to grain boundary attack and dissolution of non-metallic precipitates, while for SAA it was primarily attributed to surface cracking caused by the dissolution of non-metallic precipitates. Differences in fatigue loss and failure mode were also observed, with SAA samples showing greater fatigue loss and more multi-failure sites when notched.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
Kang Xiao, Peng Liu, Siyu Sun, Wei Guo, Shikai Li, Jiaying Hu, Hepeng Zhang
Summary: The fatigue crack propagation behavior of FSW welded 7050-T7451 joints was studied using compact tensile specimens. The FCP rate in different regions of the joint varied, with different fracture morphologies observed at different stages of FCP. Overall, the fracture characteristics evolved from tearing ridges and river patterns to dimple fractures and fatigue striations as FCP progressed through its three stages.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Materials Science, Multidisciplinary
Ye Tian, Lili Wei, Hongfeng Huang, Chongyu Liu, Xuda Xu, Yonggang Tong, Shuhui Liu, Hongjie Jiang
Summary: This study investigated the effects of friction stir processing tool rotating rate and subsequent artificial aging on the microstructure and mechanical properties of 7050-T7451 alloy. The results showed that rotating rate and artificial aging treatment significantly affected the grain morphology and precipitated phases. The mechanical properties of the alloy were improved through solid solution strengthening and precipitation strengthening.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Engineering, Mechanical
Sabrina Vantadori, Andrea Zanichelli, Camilla Ronchei, Daniela Scorza, Andrea Carpinteri
Summary: This paper investigates the crack nucleation location in fretting-affected Al 7050T7451 specimens subjected to partial slip. Experimental evidence suggests that cracks can start within the contact zone rather than just at the trailing edge. A parametric study is conducted to explore four different crack nucleation locations on the contact surface, ranging from the trailing edge to the micro-slip region.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Stefan B. Lindstrom, Johan Moverare, Daniel Leidermark, Hans Ansell, Zlatan Kapidzic
Summary: The study adapts the OSR incremental fatigue damage model for high-cycle fatigue in specimens with stress-raisers in AA7050-T7, showing good agreement across different conditions. By integrating fatigue life for an aircraft load spectrum, the predictive capability of the model is demonstrated.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
Chen Haotian, Ge Liangchen, Liu Xiaoming, Tian Zongjun, Xu Boyuan, Hua Guoran
Summary: In this paper, a simulation model of a concave model with different curvatures for 7050-T7451 aluminum alloy was established and analyzed using the simulation software ABAQUS. The study evaluated the dynamic response and strengthening effect of laser shock processing, as well as the magnitude and distribution of residual stress and deformation. The effects of impact pressure, longitudinal wave reflection, surface wave convergence, and horizontal components in the concave model were also analyzed. The results showed that the impact pressure and curvature of the concave model have an influence on the magnitude and distribution of residual stress and deformation.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Engineering, Mechanical
Micael F. Borges, Fernando V. Antunes, Joel Jesus, Ricardo Branco, Pedro Prates, Diogo M. Neto
Summary: This study focuses on the anisotropic fatigue crack growth behavior of an aluminum AA7050-T7451 plate. A numerical model based on plastic strain at the crack tip as the driving force for crack growth was calibrated using experimental data from low cycle fatigue tests. The predicted crack growth rates agree well with experimental trends, suggesting that cyclic plastic deformation is the main damage mechanism. The model was also used to estimate the stress ratio effect and found a correlation with crack closure variations, but additional microstructural effects not linked to crack closure were observed at R=0.05.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Mingtao Wang, Liwei Wang, Wendi Yang, Yuxi Liu, Herman Terryn, Zhongyu Cui
Summary: The effect of bisulfite (HSO3-) on the stress corrosion cracking (SCC) behavior of 7050-T7451 aluminum alloy in the presence of Cl- in a thin electrolyte layer environment is investigated. The addition of HSO3- inhibits corrosion initiation but promotes corrosion propagation and hydrogen uptake. Quantitative calculation demonstrates that HSO3- significantly facilitates the synergistic effect among stress, corrosion, and hydrogen, causing a shift in the controlling step of SCC from corrosion-induced hydrogen to mechanical-electrochemical-hydrogen interactions. The buffer effect of HSO3- plays a dominant role in the HSO3--induced acceleration of SCC degradation.
Article
Engineering, Mechanical
Michele Angelo Attolico, Caterina Casavola, Vincenzo Moramarco, Gilda Renna, Domenico Furfari, David Osman Busse
Summary: This study analyzed the properties of the TSA anodic layer and its influence on the fatigue behavior of AA 7050-T7451, revealing that TSA led to a reduction in fatigue life, particularly at lower stress amplitudes, due to the presence of defects at the substrate and anodic film interface.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Engineering, Mechanical
Ping Zhang, Xiancheng Zhang, Xian Cao, Xiao Yu, Youqiang Wang
Summary: The machinability and tool wear behavior of 7050-T7451 aluminum alloy were compared under different cutting parameters and vibration frequencies in conventional cutting (CC) and ultrasonic elliptical vibration cutting (UEVC) processes. Results showed that UEVC required about three fifths the cutting force of CC under the same parameters, with higher cutting surface quality. The cutting surface of UEVC exhibited precipitate-free zones, while tool wear in CC was typically tipping, spalling, adhesive, or oxidative wear, while in UEVC it mainly consisted of impact-induced mechanical wear such as abrasive, mild oxidative, and mild adhesive wear.
Article
Engineering, Mechanical
J. S. Jesus, F. V. Antunes, P. Prates, R. Branco, P. V. Antunes, L. P. Borrego, D. M. Neto
Summary: The effect of L-T and S-T orientations on FCGR in 7050-T7451 and 2050-T8 aluminum alloys is studied. Lower FCG rates are obtained in the L-T orientation, which can be attributed to increased resistance at grain boundaries. Additionally, crack deflection observed in the L-T direction also affects the FCGR.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
Noelle Easter, James T. Burns
Article
Engineering, Mechanical
Noelle Easter C. Co, James T. Burns
INTERNATIONAL JOURNAL OF FATIGUE
(2017)
Article
Materials Science, Multidisciplinary
Noelle Easter C. Co, Donald E. Brown, James T. Burns
Article
Electrochemistry
Nathan Brown, Brandi Clark, Patrick Kramer, Noelle Easter C. Co, Fritz Friedersdorf, James Burns
Article
Mechanics
Andrea Nicolas, Noelle Easter C. Co, James T. Burns, Michael D. Sangid
ENGINEERING FRACTURE MECHANICS
(2019)
Article
Engineering, Mechanical
Noelle Easter C. Co, James T. Burns
Summary: The fatigue resistance of aerospace structures is affected by corrosion damage. The formation of fatigue cracks is influenced by the micro-scale corrosion morphologies and underlying microstructure. A modest correlation was found between the initiation of fatigue cracks and grains with high misorientation angles with respect to adjacent grains.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
