Quantitative evaluation of micro-cracks using nonlinear ultrasonic modulation method. (April 2016)

• Record Type: Journal Article
• Authors: Li, Nan; Sun, Junjun; Jiao, Jingpin; Wu, Bin; He, Cunfu
• Is Part Of: NDT & E international. Volume 79(2016)
• Page Start: 63
• Page End: 72
• Publication Date: 2016-04
• Subjects: Non-destructive test -- Quantitative evaluation -- Nonlinear ultrasonic modulation -- Bispectral analysis -- Modulation factor; Nondestructive testing -- Periodicals; Contrôle non destructif -- Périodiques; Electronic journals; 620.1127
• DOI: 10.1016/j.ndteint.2015.12.003
• Languages: English
• ISSNs: 0963-8695

Abstract

Abstract: Nonlinear acoustic coefficients have a close relationship with structural cracks. A nonlinear ultrasonic modulation method for micro-crack quantitative evaluation is developed. The influence of phase threshold on the crack evaluation is discussed. Ultrasonic modulation using a unilateral incentive model is applied to the quantitative evaluation of micro-cracks for different specimens. The experimental results indicate that the method can be beneficially applied for micro-cracks detection. A proper phase threshold can improve the reliability of the method based on nonlinear ultrasonic modulation. The presented modulation factor can be used to quantitatively evaluate the structural cracks, and it is suitable for small-crack quantitative evaluation.