摘要
搅拌摩擦焊焊缝损伤定量化检测是焊缝服役性能评价的重要手段,但如何利用尽可能少的传感器结合焊缝自身特性实现焊缝内损伤的高效识别是挑战性问题.本文通过研究超声导波在焊缝中传播时因能陷效应形成的焊缝特征导波,提出基于焊缝特征导波的焊缝损伤定量化识别方法.首先绘制了2219铝合金超声导波频散曲线,并介绍焊缝特征导波形成机制与损伤定位原理;然后对比分析3种不同类型的压电传感器激励和接收焊缝特征导波的信号特性,确定以长度伸缩型矩形压电传感器进行焊缝内不同损伤扩展实验.实验结果表明,随着孔深和孔径的增大以及裂纹长度的增加,焊缝中损伤特征导波反射回波的幅值基本上均呈线性增长的趋势.
As an important method to evaluate the service performance of friction stir welding(FSW)plates,the damage quantitative detection demands considerable research attention.However,it poses a challenge to identify weld damage efficiently with weld characteristics and a minimal number of sensors.In this paper,we study a quantitative identification method of weld damage based on weld-guided wave formed by the trapping effect of guided wave propagating in the weld.First,the dispersion curve of 2219 aluminum alloy is drawn,and the formation mechanism of weld-guided waves and the principle of damage location are introduced.Then,the signal characteristics of weld-guided waves generated and received by three different piezoelectric sensors are compared and analyzed.The length-expansion rectangular piezoelectric sensors are determined to conduct different damage propagation tests on two FSW aluminum plates.Test results show that,with the increase of hole depth and diameter as well as that of the crack length,the amplitude of damage echo signals versus the damage growth shows a linear increase trend.
作者
张义亮
张柔
贺梦悦
刘德博
胡正根
方亮
王奕首
ZHANG Yiliang;ZHANG Rou;HE Mengyue;LIU Debo;HU Zhenggen;FANG Liang;WANG Yishou(School of Aerospace Engineering,Xiamen University,Xiamen 361102,China;Xiamen University Tan Kah Kee College,Zhangzhou 363105,China;Beijing Institute of Astronautical Systems Engineering,Beijing 100012,China)
出处
《厦门大学学报（自然科学版）》
CAS
CSCD
北大核心
2023年第4期544-553,共10页
Journal of Xiamen University：Natural Science
关键词
结构健康监测
搅拌摩擦焊
焊缝特征导波
损伤定量监测
structural health monitoring
friction stir welding
weld-guided wave
quantitative damage monitoring
