Acoustic Emission Characteristics Determination for Online Structural Monitoring of Fatigue Crack Growth inAluminium Alloy 2025

Document Type : Original Research Article


1 Department of Aerospace Engineering, Faculty of Graduate Studies, Shahid Sattari Aeronautical University, Tehran, Iran

2 Department of Mechanical Engineering, Faculty of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran


In the use of metals, due to industrial advances and the application of more dynamic loads, it is necessary to pay more attention to the fatigue issue. Structural health monitoring (SHM) system is a method of evaluating and monitoring structural health. It has been widely applied in various engineering sectors due to its ability to respond to adverse structural changes, improving structural reliability and life cycle management. Non-destructive inspection methods are used to condition and health monitoring structures at the time of production and even during the service life of parts. Among non-destructive methods, the acoustic emission method has become a standard and reliable method in recent years. The stimulated internal energy of the structure is received in this acoustic emission technique as health monitoring features. A dominating attribute of the acoustic emission technique is its application ability in its loading condition. Therefore, it provides instant damage information within a short period of time. Thus, acoustic emission monitoring tests are often performed in the operating conditions of the structure. Acoustic emissions can inform us of the changes that occur before the final failure and prevent much financial and human damage. In this project, the characteristics of acoustic emission in the fatigue crack growth of aluminum alloy 2025 for online structural monitoring have been investigated and determined. Acoustic emission tests have been performed in two parts: bending fatigue test with the aim of initiation of fatigue cracks in aluminum alloy 2025 specimens and following tensile tests with the aim of growth of fatigue cracks. The acoustic emission signals and parameters sent by the acoustic emission sensor during both tests were received and recorded by the acoustic emission software. According to the received acoustic emission information, various diagrams are plotted. Analyzing the results from online acoustic emission monitoring showed the acoustic emission method can be considered a suitable and reliable technique for detecting crack initiation and crack growth in aluminum alloy 2025.


Main Subjects

[1]    K.K. Chawla, M.A. Meyers, Mechanical behavior of materials,Cambridge university press, 2008.
[2]    M.C. Kushan, S.F. Diltemiz and I. Sackesen, “Failure analysis of an aircraft propeller,” Engineering failure analysis, pp. 1693–1700, 2007.
[3]    Y. Mizutani, Practical acoustic emission testing, Springer, 2006.
[4]    American Society for Testing and Materials,Nondestructive evaluation and test: ASTM hand book, 9th edition, 1994.
[5]    Wahab Magd Abdel, Zhou Yun Lai, Maia Nuno Manuel Mendes,Structural Health Monitoring by Acoustic Emission Technique,IntechOpen,  2018.
[6]    Noorsuhada Md Nor, “Structural health monitoring
through acoustic emission”,Eco-efficient Repair and Rehabilitation of Concrete Infrastructures, pp. 123–146, 2018.
[7]    American Society for Testing and Materials,Bending test methods for bend testing of metallic flat materials for spring application involving:ASTM, 2013.
[8]    W.H. Prosser, “The propagation characteristics of the plate modes of acoustic emission waves in thin aluminum plates and graphite/epoxy composite plate and tubes,” Ph.D. dissertation, John Hopkins University, Maryland, 1991.
[9]    Y. Blanchette, J.I. Dickson and M.N. Bassim, “Acoustic emission behavior crack growth of 7075-T651 Al alloy,” Engineering fracture mechanics, vol.24, pp. 647-656, 1986.
[10]  Mengyu Chai, Z. X. Zhang, Quan Duan, “Identification and prediction of fatigue crack growth under different stress ratios using acoustic emission data” , International Journal of Fatigue, July 2022.
[11]  Michele Carboni, David Crivelli, “An acoustic emission based structural health monitoring approach to damage development in solid railway axles,” International Journal of Fatigue, 2020.
[12]  “AZoM.Aluminum 2025 alloy(UNSA92025),”, May 10, 2013.[Online].Available: [Accessed: 17-May-2013].