METALS AND METAL MATRIX COMPOSITES |
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Research Progress on Fatigue Properties of Al Foams |
YANG Xudong1, LIU Guanfu1, HU Qi1, ZOU Tianchun2, SHA Junwei3, ZONG Rongrong4
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1 Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin 300300, China 2 College of Airworthiness, Civil Aviation University of China, Tianjin 300300, China 3 School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China 4 Tianjin Jinliyan Automobile Engineering & Technology Co., Ltd., Tianjin 300392, China |
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Abstract Aluminum foams have been widely applied due to its excellent mechanical, electrical and thermodynamic properties. At present, the research of aluminum foams mainly focus on quasi-static and high strain rate uniaxial compression properties. However, with the diversification of the application environment of aluminum foams, it is inevitable that the cyclic loading will act on the aluminum foams. Therefore, it is of great significance to fully understand the fatigue properties of aluminum foams and the failure mechanism under cyclic loading. According to the different loading modes in the fatigue test, the fatigue of aluminum foams can be divided into two types, compression-compression fatigue and tension fatigue. Because of the irregular internal structure and the individual differences among specimens, the fatigue perfor-mance is discrete. Therefore, the definition of fatigue life and fatigue strength is not the same. In addition, scholars have carried out a series of studies on the factors affecting the fatigue properties of aluminum foams,and have made certain progress. The factors affecting the fatigue properties which are widely accepted include the structure and morphology of the foams, the size of the specimen, the matrix and the reinforcement materials, and the heat treatment. The in-depth understanding of the factors affecting the fatigue properties will help to improve the fatigue life and fatigue strength in the complex application environment. Due to the limitations of sample structure and research methods, the failure analysis of aluminum foams have not reached a unified conclusion at present. Meanwhile, there are relatively few reports on the mode of fatigue crack propagation. The researchers mainly analyzed the failure mechanisms of aluminum foams from the aspects of fatigue strain-number of circles curve and internal defects. This paper analyze the domestic and foreign literature combined with the work of the author's group, and then discuss some important problems in the study of fatigue properties of aluminum foams. The fatigue properties of aluminum foams under two kinds of fatigue loading modes (compression-compression and tension fatigue) are mainly introduced. The different definitions of parameters such as fatigue life, fatigue strength and stress level are discussed. The influence of different factors on fatigue properties of aluminum foams is discussed. In order to improve the fatigue performance, reduction of the pore size and increment of the uniformity of the pore structure were proposed. In addition, the fatigue failure mechanism of aluminum foams is discussed from macroscopic and microscopic perspectives.
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Published: 25 January 2022
Online: 2022-01-26
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Fund:Tianjin Science and Technology Planning Project (20YDTPJC01600), the Fundamental Research Funds for the Central Universities of Civil Aviation University of China (3122020083). |
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