Fatigue Life Estimation under High Temperature and Variable Loading of AA7001-T6 Using Shot Peening
Main Article Content
Abstract
In this study, the fatigue life of aluminum alloys (7001-T6) was predicted with shot peening at various temperatures. Surface treatment with shot peening steel balls is a mechanism for reducing damage. An experimental investigation was conducted to find the degree of fatigue accumulation for AA7001-T6 under rotational bending loading and stress ratio R = −1. The experiments were conducted at RT (25 ℃), 330 ℃, and SP + 330 ℃ temperatures. A modified damage stress model that considers damage at various load levels was recommended for forecasting the fatigue life under high temperatures. The model and experimental results were compared to determine the most damage (Miner’s rule). The experimental results of the fatigue life indicated that the increased testing temperature reduced the fatigue life. However, using shot peening at high temperatures increased the fatigue life by 8% when loading sequence L-H and 10% when loading sequence H-L. The results showed a satisfactory degree of safety for the present model. Nevertheless, Miner’s model featured two models: one for low–high loading and high-low loading. The results were proper for prolonging fatigue life.
Metrics
Article Details

This work is licensed under a Creative Commons Attribution 4.0 International License.
THIS IS AN OPEN ACCESS ARTICLE UNDER THE CC BY LICENSE http://creativecommons.org/licenses/by/4.0/
Plaudit
References
Maha NA. Fatigue Life Prediction of Aluminum Alloy Using Electrical Drop Technique. Ph.D. Thesis. University of Technology; Baghdad, Iraq: 2016.
Santecchia E, Hamouda AMS, Musharavati F, Zalnezhad E, Cabibbo M, ElMehtedi M, Spigarelli S. A Review on Fatigue Life Prediction Methods for Metals. Advance in Materials Science and Engineering 2016; 2016: 9573524 (1-26). DOI: https://doi.org/10.1155/2016/9573524
Karakasi Ö, Szusta J. Monotonic and Low Cycle Fatigue Behavior of 2024-T3 Aluminum Alloy between Room Temperature and 300 °C for Designing VAWT Components. Fatigue and Fracture of Engineering Materials and Structures 2015; 39(1): 95–109. DOI: https://doi.org/10.1111/ffe.12336
Qandil A, Zaid AI. Effect of Shot Peening and Grain Refinement on the Fatigue Life and Strength of Commercially Pure Al and Two of its Alloys: Al-2024-T3 and Al-7075-T6. Materials Science and Engineering 2016; 146(1): 012028, (1-8). DOI: https://doi.org/10.1088/1757-899X/146/1/012028
Alhamdany AA, Khenyab AY, Mohammed QK, Alalkawi HJM. Development Mechanical and Fatigue Properties of AA7001 After Combined SP with Deep Cryogenic Treatment and UIP with Deep Cryogenic Treatment. Eastern-European Journal of Enterprise Technologies 2021; 5(1): 113, (62-69). DOI: https://doi.org/10.15587/1729-4061.2021.243391
Ertas A. Engineering Mechanics and Design Applications. 1st ed., Boca Raton: CRC Press; 2012.
Laseure N, Schepens I, Micone N, De Waele W. Effects of Variable Amplitude Loading on Fatigue Life. International Journal of Sustainable Construction and Design 2015; 6(3): 1-10. DOI: https://doi.org/10.21825/scad.v6i3.1131
Hantoosh ZK. Fatigue Life Prediction at Elevated Temperature under Low–High and High–Low Loading Based on Mechanical Properties Damage Model. Engineering and Technology Journal 2012; 30(11): 1886-1896. DOI: https://doi.org/10.30684/etj.30.11.4
Zakaria KA, Abdullah S, Ghazali MJ, Elevated Temperature Fatigue Life Investigation of Aluminium Alloy Based on the Predicted SN Curve. Journal Teknologi 2013; 63(1): 75-79. DOI: https://doi.org/10.11113/jt.v63.1345
Al-Alkawi HJ, Kareem FA, Ali AAM. Prediction of FatigueCreep Interaction Life of Aluminum Alloy AA7349 Using Electromechanical Devices. Engineering and Technology Journal 2015; 33(3): 535-547.
Ali AJH. Improvement of Fatigue Life of AA 7075 Using Laser Shock Peening (LSP) Surface Treatment Technique. Al-Taqani Refereed Scientific Journal 2016; 29: 47-57.
Kadhim MJ, Kamal HM. Cumulative Thermal Fatigue Damage for Aluminum Alloy under Variable Stresses. IOP Conference Series: Materials Science and Engineering 2018; 454(1): 012145, (1-9). DOI: https://doi.org/10.1088/1757-899X/454/1/012145
Mahammed MS, Alalkawi HJ, Faris ST. Cumulative Fatigue Damage of AA7075-T6 under Shot Peening and Ultrasonic Surface Treatments. Diyala Journal of Engineering Sciences 2021; 14(1): 1-10. DOI: https://doi.org/10.24237/djes.2021.14101
Mahdi HS, Alalkawi HJ, Faris ST. Mechanical Properties and Fatigue Life Evaluation under High Temperature and Shot Peening Application Using AA7001. International Journal of Nanoelectronics and Materials 2023; 16(3): 1-10.
Taif YG. Design and Modification of a Computerized Tensile Test Machine at High Temperature. M.Sc. Thesis. University of Technology; Baghdad, Iraq: 2020.
Schijve J. The Accumulation of Fatigue Damage in Aircraft Materials and Structures. Advisory Group for Aerospace Research and Development Neuilly-Sur-Seine (FRANCE): 1972.
Al-Alkawi HJ, Kareem FA, Ali AAM. Prediction of Fatigue Creep Interaction Life of Aluminum Alloy AA7349 Using Electromechanical Devices. Engineering and Technology Journal 2015; 33(3): 535-547. DOI: https://doi.org/10.30684/etj.33.3A.9