锻压技术

AZ31镁合金单向及交变载荷作用下声发射波形特征对比分析

英文标题：Comparative analysis on acoustic emission waveform characteristic for AZ31 magnesium alloy under unidirectional and alternating loads

作者：贺秀丽梁红玉闫志峰

单位：太原工业学院

关键词：镁合金单向载荷交变载荷声发射波形特征

分类号：TH142.3

出版年,卷(期):页码：2021,46(8):193-198

摘要：

采用声发射技术对AZ31镁合金在单向及交变载荷作用下的试验过程进行全程监测，对比分析其声发射波形特征，探讨塑性变形的产生及变化对镁合金声发射波形特征的影响。结果表明，不同载荷状态会产生不同的塑性变形，对镁合金声发射波形特征具有重要影响。与单向载荷作用相比，AZ31镁合金在交变载荷作用下,声发射波形具有明显的周期性和台阶现象等特点，其分别与裂纹闭合效应及材料塑性变形损伤有关。此外，AZ31镁合金在交变载荷作用下连续型声发射波形的平均波幅比单向载荷作用下的提高了约80 mV，除了塑性损伤累积的原因外，还有交变载荷作用下外部试验环境中较大背景噪声的作用。

The whole test process of AZ31 magnesium alloy under unidirectional and alternating loads was monitored by acoustic emission technology, its acoustic emission waveform characteristics were comparied and analyzed, and the influences of the generation and change of plastic deformation on the acoustic emission waveform characteristics of magnesium alloy were discussed. The results show that the different plastic deformations are produced by different load conditions, which have an important influence on the acoustic emission waveform characteristics of magnesium alloy. Compared with the unidirectional load, the acoustic emission waveform of AZ31 magnesium alloy under alternating load has the characteristics of obvious periodicity and step phenomenon, which are related to crack closure effect and material plastic deformation damage, respectively. Moreover, the average amplitude of continuous acoustic emission waveform for AZ31 magnesium alloy under alternating load is about 80 mV higher than that under unidirectional load. In addition to the accumulation of plastic damage, there is also the effect of large background noise in the external test environment under alternating load.

基金项目：

国家自然科学基金资助项目(51705350)；山西省高等学校科技创新项目(2019L0922)；山西省青年科技研究基金项目（201801D221137）

贺秀丽(1985-)，女，博士，副教授 E-mail：good.168@126.com 通信作者：梁红玉（1968-），女，博士，教授 E-mail：285824749@qq.com

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