Damage detection in composite plates by using an enhanced time reversal method

被引：0

作者：

Sohn, Hoon ^{[1
]}

Park, Hyun Woo ^{[2
]}

Law, Kincho H. ^{[3
]}

Farrar, Charles R. ^{[4
]}

机构：

[1] Dept. of Civil and Environmental Engineering, Korean Advanced Institute of Science and Technology, Daejeon, Korea, Republic of

[2] Dept. of Civil Engineering, Dong-A Univ., Busan, Korea, Republic of

[3] Dept. of Civil and Environmental Engineering, Stanford Univ., Stanford, CA 94305

[4] ESA-WR, MS T006, Los Alamos National Laboratory, Los Alamos, NM 87545

来源：

Journal of Aerospace Engineering | 2007年 / 20卷 / 03期

关键词：

A damage detection technique; which does not rely on any past baseline signals; is proposed to assess damage in composite plates by using an enhanced time reversal method. A time reversal concept of modern acoustics has been adapted to guided-wave propagation to improve the detectability of local defects in composite structures. In particular; wavelet-based signal processing techniques have been developed to enhance the time reversibility of Lamb waves in thin composite laminates. In the enhanced time reversal method; an input signal at an excitation point can be reconstructed if a response signal measured at another point is reemitted to the original excitation point after being reversed in a time domain. This time reversibility is based on linear reciprocity of elastic waves; and it is violated when nonlinearity is caused by a defect along a direct wave path. Examining the deviation of the reconstructed signal from the known initial input signal allows instantaneous identification of damage without requiring the baseline signal for comparison. The validity of the proposed method has been exemplified through experimental studies on a quasi-isotropic laminate with delamination. © 2007 ASCE;

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摘要：

Journal article (JA)

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页码：141 / 151