铝薄板模拟分层缺陷的阵列涡流检测仿真

Simulation and Experimental Verification for Delamination Defect of Aluminum Sheet Using Eddy Current Sensor Array Measurements

采用阵列涡流检测方法对4mm厚铝薄板进行检测,用不同孔径、不同埋深的平底孔模拟分层缺陷,通过Ansys仿真和试验检测工艺参数、缺陷大小与埋深对阵列涡流信号的影响。结果表明:阵列涡流检测在探头以标称频率工作时灵敏度最高,在缺陷直径8~12mm范围内,相同尺寸的缺陷,埋深越小,感应电压越大,相位滞后角减小;埋深相同的缺陷,缺陷尺寸对相位值影响较小,可以通过感应信号相位来确定分层缺陷埋深。

This paper presents an eddy current array technique to detecting the delamination detect of aluminum sheet.The simulation using Ansys software and experimental verification were performed to investigate the impact of process parameters,defect size and depth on eddy current signals.The flat bottom holes with different aperture and depth were employed to simulate the delamination defects..The results showed that there was the highest sensitivity when the nominal frequency of eddy current array probe was used.Within the defect diameter range of 8-12 mm,for the constant defect size,with defect depth decreasing the induced voltage increased and phase lag angle deceased;for the constant defect depth,the defect size had little influence on the phase angle.So the delamination defect depth can be determined through the induction signal.