Investigations of the fatigue damage in 16Mn steels by wavelet-based acoustic emission technique

Proceedings of the IEEE 2012 Prognostics and System Health Management Conference (PHM-2012 Beijing) Pub Date : 2012-05-23 DOI:10.1109/PHM.2012.6228805

Jing Li, Zhiyuan Han, Hongyun Luo, Jingwei Cao, Yubo Zhang

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引用次数: 5

Abstract

16Mn steel is widely used in the large structural machines such as cranes. Fatigue is one of the most common failure modes in this material. Thus, monitoring of the fatigue damage in 16Mn steel is important for the health monitoring of these large engineering structures. In this paper, fatigue crack propagation tests were carried out for hot rolled and low temperature tempered 16Mn steels. Acoustic emission (AE) signals obtained from the fatigue tests were processed by wavelet packet transform (WPT) analysis. The energy distribution in each component of the AE signals was calculated for different specimens. Ratio of energy was extracted as a feature parameter. The results showed that the ratio of energy in each node was different in the hot rolled and low temperature tempered 16Mn steels respectively. The ratio of energy depended on the micro-structure. Based on the SEM fractography observations in this study, these results could be well explained by the different fatigue crack propagation mechanisms.

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基于小波声发射技术的16Mn钢疲劳损伤研究

16Mn钢广泛应用于起重机等大型结构机械。疲劳是这种材料最常见的失效模式之一。因此，监测16Mn钢的疲劳损伤对这些大型工程结构的健康监测具有重要意义。本文对16Mn钢进行了热轧和低温回火疲劳裂纹扩展试验。对疲劳试验声发射信号进行小波包变换分析。计算了不同试样声发射信号各分量的能量分布。提取能量比作为特征参数。结果表明:热轧16Mn钢和低温回火16Mn钢各节点的能量比不同;能量的比例取决于微观结构。基于本研究的SEM断口观察，这些结果可以很好地解释为不同的疲劳裂纹扩展机制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of the IEEE 2012 Prognostics and System Health Management Conference (PHM-2012 Beijing)

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