Multi-crack imaging using nonclassical nonlinear acoustic method

doi:10.1088/1674-1056/23/10/104301

›› 2014, Vol. 23 ›› Issue (10): 104301-104301.doi: 10.1088/1674-1056/23/10/104301

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Multi-crack imaging using nonclassical nonlinear acoustic method

张略, 张盈, 刘晓宙, 龚秀芬

Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China

收稿日期:2013-11-12 修回日期:2014-02-18 出版日期:2014-10-15 发布日期:2014-10-15
基金资助:
Project supported by the National Basic Research Program of China (Grant Nos. 2012CB921504 and 2011CB707902), the National Natural Science Foundation of China (Grant No. 11274166), the Funds from the State Key Laboratory of Acoustics, Chinese Academy of Sciences (Grant No. SKLA201401), and the China Postdoctoral Science Foundation (Grant No. 2013M531313).

Multi-crack imaging using nonclassical nonlinear acoustic method

Zhang Lue (张略), Zhang Ying (张盈), Liu Xiao-Zhou (刘晓宙), Gong Xiu-Fen (龚秀芬)

Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China

Received:2013-11-12 Revised:2014-02-18 Online:2014-10-15 Published:2014-10-15
Contact: Liu Xiao-Zhou E-mail:xzliu@nju.edu.cn
About author:43.25.+y; 43.35.+d
Supported by:
Project supported by the National Basic Research Program of China (Grant Nos. 2012CB921504 and 2011CB707902), the National Natural Science Foundation of China (Grant No. 11274166), the Funds from the State Key Laboratory of Acoustics, Chinese Academy of Sciences (Grant No. SKLA201401), and the China Postdoctoral Science Foundation (Grant No. 2013M531313).

摘要/Abstract

摘要： Solid materials with cracks exhibit the nonclassical nonlinear acoustical behavior. The micro-defects in solid materials can be detected by nonlinear elastic wave spectroscopy (NEWS) method with a time-reversal (TR) mirror. While defects lie in viscoelastic solid material with different distances from one another, the nonlinear and hysteretic stress-strain relation is established with Preisach-Mayergoyz (PM) model in crack zone. Pulse inversion (PI) and TR methods are used in numerical simulation and defect locations can be determined from images obtained by the maximum value. Since false-positive defects might appear and degrade the imaging when the defects are located quite closely, the maximum value imaging with a time window is introduced to analyze how defects affect each other and how the fake one occurs. Furthermore, NEWS-TR-NEWS method is put forward to improve NEWS-TR scheme, with another forward propagation (NEWS) added to the existing phases (NEWS and TR). In the added phase, scanner locations are determined by locations of all defects imaged in previous phases, so that whether an imaged defect is real can be deduced. NEWS-TR-NEWS method is proved to be effective to distinguish real defects from the false-positive ones. Moreover, it is also helpful to detect the crack that is weaker than others during imaging procedure.

关键词: nonclassical nonlinear acoustics, nonlinear elastic wave spectroscopy, time reversal, multi-carcks imaging

Abstract: Solid materials with cracks exhibit the nonclassical nonlinear acoustical behavior. The micro-defects in solid materials can be detected by nonlinear elastic wave spectroscopy (NEWS) method with a time-reversal (TR) mirror. While defects lie in viscoelastic solid material with different distances from one another, the nonlinear and hysteretic stress-strain relation is established with Preisach-Mayergoyz (PM) model in crack zone. Pulse inversion (PI) and TR methods are used in numerical simulation and defect locations can be determined from images obtained by the maximum value. Since false-positive defects might appear and degrade the imaging when the defects are located quite closely, the maximum value imaging with a time window is introduced to analyze how defects affect each other and how the fake one occurs. Furthermore, NEWS-TR-NEWS method is put forward to improve NEWS-TR scheme, with another forward propagation (NEWS) added to the existing phases (NEWS and TR). In the added phase, scanner locations are determined by locations of all defects imaged in previous phases, so that whether an imaged defect is real can be deduced. NEWS-TR-NEWS method is proved to be effective to distinguish real defects from the false-positive ones. Moreover, it is also helpful to detect the crack that is weaker than others during imaging procedure.

Key words: nonclassical nonlinear acoustics, nonlinear elastic wave spectroscopy, time reversal, multi-carcks imaging

中图分类号: (Nonlinear acoustics)

43.25.+y

43.35.+d (Ultrasonics, quantum acoustics, and physical effects of sound)

张略, 张盈, 刘晓宙, 龚秀芬. Multi-crack imaging using nonclassical nonlinear acoustic method[J]. , 2014, 23(10): 104301-104301.

Zhang Lue (张略), Zhang Ying (张盈), Liu Xiao-Zhou (刘晓宙), Gong Xiu-Fen (龚秀芬). Multi-crack imaging using nonclassical nonlinear acoustic method[J]. Chin. Phys. B, 2014, 23(10): 104301-104301.

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Multi-crack imaging using nonclassical nonlinear acoustic method

Multi-crack imaging using nonclassical nonlinear acoustic method

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