Study on Acoustic Emission Characteristics of Fatigue Damage of A7N01 Aluminum Alloy for High-Speed Trains

被引：1
作者：
Zhu, Ronghua [1 ]
Fang, Song [1 ]
Sun, Weibing [1 ]
Chi, Dazhao [2 ]
机构：
[1] Nanjing Vocat Inst Railway Technol, Coll Locomot & Vehicle, Nanjing 210000, Peoples R China
[2] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin, Peoples R China
来源：
MATERIALS | 2023年 / 16卷 / 12期
关键词：
aluminum alloy; acoustic emission; fatigue damage; online monitoring; AE source mechanisms; CRACK-GROWTH; PROPAGATION; STEEL;
D O I：
10.3390/ma16124362
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Online monitoring of the fatigue damage process of A7N01 aluminum alloy base metal and weld seam was conducted based on acoustic emission (AE) and digital microscopic imaging technology. The AE signals were recorded during the fatigue tests and analyzed using the AE characteristic parameter method. Fatigue fracture was observed using scanning electron microscopy (SEM) to analyze the source mechanism of AE. The AE results show that the AE count and rise time can effectively predict the initiation of fatigue microcracks in A7N01 aluminum alloy. The digital image monitoring results of a notch tip verified the prediction of fatigue microcracks using the AE characteristic parameters. In addition, the AE characteristics of the A7N01 aluminum alloy under different fatigue parameters were studied, and the relationships between the AE characteristic values of the base metal and weld seam and the crack propagation rate were calculated using the seven-point recurrence polynomial method. These provide a basis for predicting the remaining fatigue damage in the A7N01 aluminum alloy. The present work indicates that AE technology can be used to monitor the fatigue damage evolution of welded aluminum alloy structures.
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页数：13
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