Feasibility of ECT Technique in NDT of Ultralight Lattice Material of Sandwich Structure
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摘要: 研究了涡流检测技术对超轻多孔夹芯板无损检测的有效性。通过对波纹夹芯板和点阵桁架夹芯板的涡流检测进行建模和有限元数值模拟，研究了夹芯板焊部裂纹信号和焊部噪声信号的特征，考察了焊部形状尺寸变化对检测信号的影响，验证了利用多频信号演算方法(MFA)提取裂纹信号的可行性。计算结果表明，对于波纹夹芯板和点阵桁架夹芯板，表层和夹层焊接部位的噪声信号和裂纹信号具有明显不同的频率相位特征，裂纹信号对激励频率更敏感。焊部检测信号中的裂纹信息可利用多频信号演算方法进行分离，并可进一步对裂纹的存在和大小进行定性和定量分析。
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关键词:
- 涡流检测 /
- 超轻多孔材料 /
- 夹芯板 /
- 有限元边界元混合法 /
- 多频演算法
Abstract: The feasibility of eddy current testing(ECT) technique in the nondestructive testing(NDT) of ultralight lattice material was studied. Numerical models were proposed for two kinds of ultralight sandwich plates of ripple and truss inner layer. The ECT signals from the cracks in the welding zone and from the welding joints in the sandwich plate were simulated and their features are compared based on the proposed models and by using an FEMBEM hybrid code. The effects of the random variation in the shape of welding bead on the ECT signals, the efficiency of the multifrequency algorithm(MFA) for the crack signal extraction were also investigated. The numerical results showed that the phase property of the welding noise and the crack signals were significantly different. The phase of crack signal was more sensitive to the excitation frequency. The crack signal polluted by the welding noise could be extracted by using the multifrequency signal processing algorithm. All the results showed that ECT was a promising option for NDT of sandwich lattice metallic plate. -
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[1] 黄建明，林俊明.焊缝电磁涡流检测技术[J].无损检测,2004,26(2):95-98. [2] 雷银照，马信山.涡流法缺陷识别的研究现状[J].无损检测,1996,18(3):80-83,90. [3] 俞丽蓉.用均匀涡流探头对焊接区域进行无损探伤的研究[J].无损探伤,2002,(6):9-11. [4] 林俊明，张开良，林发柄.焊缝裂纹快速检测与深度测量[J].无损检测,2003,27(6):35-38. [5] 任吉林.涡流检测技术近20年的进展[J].无损检测,1998,20(5):121-125,128. [6] 陈德智，王彬，邵可然，等.裂纹检测中的涡流场计算[J].无损检测,2000,22(3):99-105. [7] Noritaka Yusa, Ladislav Janousek. Detection of embedded fatigue cracks in Inconel weld overlay and the evaluation of the minimum thickness of the weld overlay using eddy current testing[J]. Nuclear Engineering and Design,2006,2(11):98-103. [8] Zhenmao CHEN. Enhancement of ECT technique by probe optimization and reconstruction of cracks[D]. Japan: University of Tokyo,1997:54-56. [9] Matsuoka F. Calculation of 3D eddy current by the FEMBEM coupling method[C]. Proc. of the IUTAM, NorthHolland,1986:327-334. [10] Kurokawa M, Sugiyama K, Miya K. An inverse analysis with the current vector potential T, in Simulation and design of Applied Electromagnetic Systems[J]. ed.，T. Honma, Elsevier, Amsterdam,1994:197-200. [11] 日本AEM学会研究会.ECT检查技术的高度化研究调查报告书[R].1998,3(20):25-26,33-35. [12] Takagi T, Hashimoto H, Fukutomi H, et al. Benchmark models of eddy current testing for steam generator tube: experiment and numerical analysis[J]. Int J Appl Electromag in Materials,1994,4(5):149. [13] Chen Z, Miya K, Kurokawa M. Effects of the crack obliquity on the signal of ECT[J]. JSAEM Trans,1997,5(4):86-92. [14] 林俊明.多频涡流检测原理及应用[J].无损检测,1996,18(1):23-26.
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