Multi-crack imaging using nonclassical nonlinear acoustic method

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

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.

Keywords: nonclassical nonlinear acoustics nonlinear elastic wave spectroscopy time reversal multi-carcks imaging

Received: 12 November 2013
Revised: 18 February 2014
Accepted manuscript online:

PACS:	43.25.+y	(Nonlinear acoustics)
	43.35.+d	(Ultrasonics, quantum acoustics, and physical effects of sound)

Fund: 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).

Corresponding Authors: Liu Xiao-Zhou
E-mail: xzliu@nju.edu.cn

About author: 43.25.+y; 43.35.+d

Cite this article:

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 2014 Chin. Phys. B 23 104301


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