小于1mm多个微裂纹的解耦与精确成像

IF 8.9 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Xiangyan Ding , Saikun Yu , Lu Wang , Caibin Xu , Bo Yang , Ning Hu , Mingxi Deng , Youxuan Zhao , Xiaoyang Bi , Lijin Cheng , Jishuo Wang , Jungil Song , Denvid Lau
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引用次数: 0

摘要

微裂纹的检测和多裂纹的解耦是保证设备安全运行的关键。不幸的是,1毫米以下的微裂纹还不能精确成像,而解耦多个微裂纹则更加困难。为此,采用全矩阵捕获(FMC)的全聚焦法(TFM),通过实验和数值模拟,开发了一种基于二次谐波的非线性相控阵,用于多微裂纹的成像,其创新之处是对小尺寸微裂纹进行低频成像。非线性超声相控阵在光学显微镜下成功成像了0.47 mm的微裂纹。此外,对非线性相控阵的作用机理进行了数值研究,发现微裂纹会产生二次谐波,二次谐波遵循叠加原理,可用于微裂纹成像。在1 MHz基频下,非线性超声相控阵的最小识别精度为0.04 mm。克服了相同基频线性超声阵列的检测尺寸限制,即基波波长的一半为3.063 mm。此外,在水平和垂直方向上,双微裂缝的空间识别分别为10.00 mm和5.00 mm。非线性超声相控阵对多微裂纹具有较高的检测精度,为早期损伤检测和增材制造缺陷成像提供了实验和理论依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Decoupling and precise imaging of multiple microcracks smaller than 1 mm
The detection of microcracks and decoupling of multiple cracks are crucial for ensuring the safe operation of equipment. Unfortunately, microcracks below 1 mm scale cannot be accurately imaged yet, and decoupling multiple microcracks is even more difficult. Therefore, a nonlinear phased array based on second harmonic was developed for imaging of multiple micro-cracks by experiments and numerical simulation with Total focus method (TFM) by Full Matrix Capture (FMC), the innovation of which is to evaluate the microcrack with small size by low frequency. The nonlinear ultrasonic phased array imaged experimentally successfully a facilitate micro-crack with 0.47 mm measured by the optical microscope. Furthermore, the numerical investigation on the mechanism of nonlinear phased array found that micro-cracks could generate the second harmonic, which follows the superposition principle and can be used for imaging micro-cracks. The minimum identification accuracy of nonlinear ultrasonic phased array was 0.04 mm for 1 MHz fundamental frequency. It overcomes the detection size limitation of linear ultrasonic array with the same fundamental frequency, which is half of the wavelength of fundamental wave as 3.063 mm. In addition, the spatial recognition of double micro-cracks in the horizontal and vertical direction were obtained by 10.00 mm and 5.00 mm, respectively. The nonlinear ultrasonic phased array shows high detection accuracy for multiple micro-cracks, which provides an experimental and theoretical basis for early damage detection and additive manufacturing defects imaging.
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来源期刊
Mechanical Systems and Signal Processing
Mechanical Systems and Signal Processing 工程技术-工程:机械
CiteScore
14.80
自引率
13.10%
发文量
1183
审稿时长
5.4 months
期刊介绍: Journal Name: Mechanical Systems and Signal Processing (MSSP) Interdisciplinary Focus: Mechanical, Aerospace, and Civil Engineering Purpose:Reporting scientific advancements of the highest quality Arising from new techniques in sensing, instrumentation, signal processing, modelling, and control of dynamic systems
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