摘要
针对传统的涡流检测激励频率确定方法存在与实际情况不符和难以得到最佳检测频率的问题,基于大型通用有限元软件ANSYS建立了外径19 mm、壁厚2 mm的1Cr18Ni9Ti不锈钢管材涡流检测内插式探头和穿过式探头的仿真模型,根据差动探头的特性,通过计算距人工缺陷不同距离时检测线圈电流的实部IREAL、虚部IIMAG和线圈的阻抗差ΔZ,进而得到缺陷仿真信号,通过比较不同频率下缺陷信号的幅值和相位,确定穿过式探头的最佳检测频率为50 kHz。
In traditional eddy current testing, the optimal excitation frequency is difficult to determine and deviations are usually encountered during practical examination. To solve this problem, an inner coil and through-type eddy current testing model for a 1Cr18Ni9Ti stainless steel tube with 19 mm diameter and 2 mm thickness was established using the common finite element software ANSYS. According to the characteristic of differential probe, the real and imaginary part of the electric current, I_REAL and I_IMAG, and the impedance difference Z of the coil with different distance from defect were calculated and then the simulation signal of the artificial defect were obtained. After a careful comparison between the amplitude and phase of the signal of different frequencies, the optimal testing frequency of through-type eddy current was determined as 50 kHz.
出处
《失效分析与预防》
2014年第5期257-261,共5页
Failure Analysis and Prevention
