Liu Xiandong, Xiao Denghong, Shan Yingchun, Pan Qiang, He Tian, Gao Yong
School of Transportation Science and Engineering, Beihang University, Beijing 100191, PR China.
School of Transportation Science and Engineering, Beihang University, Beijing 100191, PR China; Beijing Electro-Mechanical Engineering Institute, Beijing 100074, PR China.
Ultrasonics. 2017 Feb;74:221-232. doi: 10.1016/j.ultras.2016.11.002. Epub 2016 Nov 9.
A localization approach of welded joint damage is proposed based on acoustic emission (AE) beamforming. In this method, a uniform line array is introduced to detect the AE signal of welded joints in specified area. In order to investigate the influence of fillet and crimping commonly existing in a welded plate structure during the AE wave propagation process, the finite element method (FEM) is applied to simulate the behavior of AE wave in the specimen. The simulation localization results indicate that the proposed localization approach can effectively localize AE sources although there exist the fillet and crimping, and it is also validated by the pencil-lead-broken test on rectangular steel tube with welded joints. Finally, the proposed method is adopted to localize the failure of solder joint in operation vibration condition. The proposed method is successful to localize the compact AE source caused by the cracked joint based on wavelet packet transform.
提出了一种基于声发射（AE）波束形成的焊接接头损伤定位方法。该方法引入均匀线阵列来检测指定区域内焊接接头的声发射信号。为了研究焊接板结构中常见的角焊缝和压接在声发射波传播过程中的影响，应用有限元方法（FEM）模拟声发射波在试样中的传播行为。模拟定位结果表明，尽管存在角焊缝和压接，所提出的定位方法仍能有效地定位声发射源，并且在带焊接接头的矩形钢管上进行的铅笔芯折断试验也验证了这一点。最后，采用所提出的方法对运行振动条件下焊点的失效进行定位。基于小波包变换，所提出的方法成功地定位了由接头裂纹引起的紧密声发射源。
