期刊论文

Study on damage characteristics of aluminized 321 steel based on acoustic emission Ib-value analysis

中文

仪器仪表学报

0254-3087

2024

45

1

211-220

10.19650/j.cnki.cjsi.J2311888

51908064:国家自然科学基金 2021JJ30717:湖南省自然科学基金项目

本校为第一机构

太阳能热发电换热管主要材料渗铝 321 钢的损伤会导致换热管的寿命缩短甚至断裂,因此必须进行损伤检测.采用声发射方法对渗铝 321 钢的损伤特性进行分析,实现对换热管性能的在线动态监测.通过采用声发射 Ib值特征来表征渗铝 321 钢的损伤程度,并运用自组织映射(SOM)神经网络算法进行声发射特征参数聚类,以分析材料的损伤模式.结果表明,力学塑性阶段的声发射事件数量剧增,能量和振铃计数的峰值标志着试件的断裂.此外,在试件失效前,Ib值显著降低且密度变密集,表明Ib值的变化特征可以作为材料临界失效的预警信号.通过SOM算法对特征参数进行聚类分析得到 4 个簇及其对应的特征频率,并使用扫描电子显...

The damage to aluminized 321 steel,which is the main material of solar thermal power heat exchange tube,will lead to the shortening or even fracture of the life of the heat exchange tube.Therefore,the damage detection must be carried out.The damage characteristics of aluminized 321 steel are analyzed by the acoustic emission(AE)method,and the online dynamic monitoring of heat exchange tube performance is realized.The damage degree of aluminized 321 steel is characterized by using the AE Ib-value feature,and the self-organized mapping(SOM)neural network algorithm is used to cluster the AE chara...