Reference-free fatigue crack detection using nonlinear ultrasonic modulation under various temperature and loading conditions

Lim, Hyung Jin; Sohn, Hoon; DeSimio, Martin P.; Brown, Kevin

doi:10.1016/j.ymssp.2013.12.001

Cited by 80 publications

(69 citation statements)

References 25 publications

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“…x with ultrasonic attenuation, 1  , 2  and 3  were attenuation coefficient of frequency 1 f , 2 f , and 3 f in the solid medium, c was the transmission speed of ultrasonic. When analyzing the simulation signal 1 x , 4096 function points were selected and the random white noise was added.…”

Section: With Ultrasonic Attenuationmentioning

confidence: 99%

“…When analyzing the simulation signal 1 x , 4096 function points were selected and the random white noise was added. …”

Section: With Ultrasonic Attenuationmentioning

confidence: 99%

“…In the process of fatigue crack extension, crack size, quantity, the complexity of the crack extension path, the internal structure of specimen was changing [1], the SHG signal of receiver was unstable which related to the cumulative damage of specimens [2]. The frequency-domain method wasn't suitable to analyze the signal because it was adaptive for smooth linear signal [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Chaotic characteristics analysis of simulation signal of second harmonic generation effect

Mao¹,

Zhang²,

Mao³

et al. 2016

Proceedings of the 2016 International Conference on Advanced Electronic Science and Technology (AEST 2016)

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Abstract. In order to deepen the understanding of nonlinear properties of specimen in the process of fatigue crack extension, the chaos and fractal theory are presented to analyze the second harmonic generation (SHG) signal of receiver in nonlinear ultrasonic system. Firstly the usefulness of chaos and fractal theory to analyze the SHG signal should be verified theoretically. By constructed the simulation signal of SHG effect, simulation signals with the character of chaotic was found, and it showed that the Lyapunov exponent was sensitive to weaker nonlinearity and unsusceptible to noise, and chaotic characteristic values could make up for inadequacies of the relative nonlinear coefficient.

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Section: With Ultrasonic Attenuationmentioning

confidence: 99%

“…When analyzing the simulation signal 1 x , 4096 function points were selected and the random white noise was added. …”

Section: With Ultrasonic Attenuationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Chaotic characteristics analysis of simulation signal of second harmonic generation effect

Mao¹,

Zhang²,

Mao³

et al. 2016

Proceedings of the 2016 International Conference on Advanced Electronic Science and Technology (AEST 2016)

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show abstract

“…Under such circumstance, a number of pairs of A and B can be calculated by solving all the combinations of the above equations in Eq. (6b), by doing which A and B can be estimated statistically, by excluding the abnormal pairs of A and B, identified as outliers [24,25] that show large differences from other pairs. The total number of the combinations of equations (pairs of A and B) can be calculated to be m!=½2 Â ðm À 2Þ!.…”

Section: Re-construction Of Vibration Displacements Based On Curvaturmentioning

confidence: 99%

Statistical enhancement of a dynamic equilibrium-based damage identification strategy: Theory and experimental validation

et al. 2015

Journal of Sound and Vibration

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“…It has been widely demonstrated that nonlinear ultrasonic techniques can be successfully deployed for detecting cracks as well as distributed structural deterioration (e.g. fatigue) [6,7,8,9,10,11,12]. The success of the developed methods is based on predicting and measuring the nonlinearities-induced wave effects which are pronounced in damaged and degraded structures but nearly un-measurable in the undamaged ones.…”

Section: Introductionmentioning

confidence: 99%

Quantification of Guided Wave Interaction Effects With Localised Structural Nonlinearities in Complex, Composite Structures

Thierry¹,

Chronopoulos²,

Ashcroft³

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. The extensive usage of composite materials in modern industrial applications implies a great range of possible structural failure modes for which the structure has to be frequently and thoroughly inspected. Nonlinear guided wave inspection techniques have been continuously gaining attention during the last decade. This is primarily due to their sensitivity to very small sizes of localized damage. A number of complex transformation phenomena take place when an elastic wave impinges on a nonlinear segment, including the generation of higher and sub-harmonics. Moreover, the transmission and reflection coefficients of each wave type become amplitude dependent. In this work, a generic Finite Element (FE) based computational scheme is presented for quantifying guided wave interaction effects with Localized Structural Nonlinearities (LSN) within structures of arbitrary layering and geometric complexity. Amplitude dependent guided wave reflection, transmission and conversion is computed through a Wave and Finite Element (WFE) method. The scheme couples wave propagation properties within linear structural waveguides to a LSN and is able to compute the generation of higher and sub-harmonics for each wave type through a harmonic balance projection. A Newton-like iteration scheme is employed for solving the system of nonlinear differential equations. Numerical case studies are exhibited for a set of waveguides coupled through a joint exhibiting nonlinear mechanical behaviour.

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Reference-free fatigue crack detection using nonlinear ultrasonic modulation under various temperature and loading conditions

Cited by 80 publications

References 25 publications

Chaotic characteristics analysis of simulation signal of second harmonic generation effect

Chaotic characteristics analysis of simulation signal of second harmonic generation effect

Statistical enhancement of a dynamic equilibrium-based damage identification strategy: Theory and experimental validation

Quantification of Guided Wave Interaction Effects With Localised Structural Nonlinearities in Complex, Composite Structures

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