二维结构中亚波长缺陷的超声特征
Ultrasonic characteristics of sub-wavelength defects in two-dimensional structure
摘 要
在复合材料中，对于亚波长缺陷的检测还比较困难。基于包含铝和水的二维结构，通过时域有限差分法仿真研究了亚波长缺陷的超声特征，结果表明：当缺陷尺寸和缺陷间排列位置改变时，超声反射信号波形出现了相应的改变，这可以用于从反射回波中提取特征，从而确定亚波长缺陷的尺寸及排列位置。
时域
超声
无损检测
sub-wavelength defect
time domain
ultrasonic
nondestructive detection
Abstract
In artificial composite materials, the detection of sub-wavelength defects is still difficult.This thesis established two-dimensional aluminum plate models based on finite difference properties method (FDTD) to study the ultrasonic characteristics of sub-wavelength defects. It is found that when the size and arrangement position of the defect change, the waveform of the ultrasonic reflection signal changes accordingly, which can be used to extract the feature from the reflected echo to determine the size and arrangement position of the sub-wavelength defect.
中图分类号 TG115.28 DOI 10.11973/wsjc201911013
所属栏目 试验研究
基金项目
收稿日期 2019/2/27
修改稿日期
网络出版日期
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备注孙晨曦(1994-),男,硕士研究生,主要研究方向为金属微缺陷结构的超声特征提取
引用该论文: SUN Chenxi,SUN Li,MAO Lingfeng,ZHU Canyan,JI Aiming. Ultrasonic characteristics of sub-wavelength defects in two-dimensional structure[J]. Nondestructive Testing, 2019, 41(11): 48～52
孙晨曦,孙莉,毛凌锋,朱灿焰,季爱明. 二维结构中亚波长缺陷的超声特征[J]. 无损检测, 2019, 41(11): 48～52
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参考文献
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【3】孙莉. 声场与金属中微结构的相互作用[D]. 苏州: 苏州大学, 2016.
【4】GUIDARELLI G, CRACIUN F, GALASSI C, et al. Ultrasonic characterisation of solid-liquid suspensions[J]. Ultrasonics, 1998, 36(1): 467-470.
【5】杨晓晴. 超声波在弹性固体介质中传播的FDTD仿真[D]. 青岛: 青岛大学, 2013.
【6】周正干,魏东.时域有限差分法在超声波声场特性分析中的应用[J].机械工程学报,2010,46(2):9-13,21.
【7】CANGELLARIS A C, WRIGHT D B. Analysis of the numerical error caused by the stair-stepped approximation of a conducting boundary in FDTD simulations of electromagnetic phenomena[J]. Antennas & Propagation IEEE Transactions on, 1991, 39(10): 1518-1525.
【8】SUI W, CHRISTENSEN D A, DURNEY C H. Extending the two-dimensional FDTD method to hybrid electromagnetic systems with active and passive lumped elements[J]. IEEE Transactions on Microwave Theory and Techniques, 1992, 40(4): 724-730.
【9】HASTINGS F D, SCHNEIDER J B, BROSCHAT S L. Application of the perfectly matched layer (PML) absorbing boundary condition to elastic wave propagation[J]. The Journal of the Acoustical Society of America, 1996, 100(5): 3061-3069.
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