Quantitative evaluation of micro-cracks using nonlinear ultrasonic modulation method

Li, Nan; Sun, Jie; Jiao, Jingpin; Wu, Bin; He, Cunfu

doi:10.1016/j.ndteint.2015.12.003

Cited by 62 publications

(23 citation statements)

References 40 publications

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“…This amplitude ratio was called modulation index in their paper, and the effectiveness of which was also confirmed by impact-modulation (a type of VAM test methods) experiments. Since then, the effectiveness and practicability of the modulation index have been further confirmed by many investigations extending from crack sizing 21,22 to impact damage detection 23 as well as fatigue life estimation, 24 and from metallic materials 22,25 to composite materials. 23,26 In this article, the NSS analysis model and modulation index mentioned above would be employed to evaluate the contact area of cracks.…”

Section: Introductionmentioning

confidence: 88%

In situ measurement of fatigue crack opening stresses by nonlinear vibro-acoustic modulation testing

Jia

Tao

et al. 2017

Advances in Mechanical Engineering

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The difficulty of accurately measuring crack closure regions has hindered measurements of opening or closure stresses, and ultrasonic methods have shown great potentialities in evaluating closure area. Many recent researches have confirmed the advantages of nonclassical nonlinear acoustic approaches in detecting short cracks and even micro-or mesocracks. However, there are few reports on using nonclassical nonlinear acoustic approaches to measure crack closure. The aim of this article is to verify the applicability of vibro-acoustic modulation approach in estimating opening stresses of fatigue cracks. A procedure of approximating the opening stress by the applied tensile load of the inflection point of the modulation intensity curve is proposed. To study the performance of this measuring method experimentally, in situ vibro-acoustic modulation tests were carried out on a central cracked 5052-H32 aluminum alloy fatigue sample. The experimental estimations match well with other researches. Analysis of the experimental results suggests that the vibroacoustic modulation technology is not only capable of measuring the fatigue cracks opening stresses, but also capable of analyzing the crack closure behavior, even for physically short cracks.

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Section: Introductionmentioning

confidence: 88%

In situ measurement of fatigue crack opening stresses by nonlinear vibro-acoustic modulation testing

Jia

Tao

et al. 2017

Advances in Mechanical Engineering

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“…In nonlinear acoustics, the relationship between stress and strain can be described by Hook’s law. On the plate, the one-dimensional nonlinear elastic wave equation can be described as [ 48 ]:

where

is the vibration displacement of particle,

is the distance of wave propagation,

is wave velocity,

is the second-order nonlinear coefficient.…”

Section: Mechanism and Methodologymentioning

confidence: 99%

Debonding Detection in Hidden Frame Supported Glass Curtain Walls Using the Nonlinear Ultrasonic Modulation Method with Piezoceramic Transducers

Hong

Liu

Liufu

et al. 2018

Sensors

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Debonding defects are common and they are the main reason for the failure of hidden frame supported glass curtain walls, which are widely used as an external enclosure and decorative structure. In this paper, a debonding detection method for hidden frame supported glass curtain walls is developed based on nonlinear ultrasonic modulation and piezoceramic transducers. First, the excitation frequency was determined according to the response characteristics. Then, empirical mode decomposition (EMD) was applied to extract the feature components. After discrete Fourier transform (DFT), the nonlinear coefficients were calculated to evaluate the debonding defect. Finally, the experimental setup was established and a series of experiments were carried out to verify the feasibility and effectiveness of the nonlinear ultrasonic modulation method. The nonlinear harmonics detection method was also investigated and it was compared with the nonlinear ultrasonic modulation method. The detection effect at different temperatures and impact were studied. The results showed that the nonlinear coefficient increases with the debonding length. The mean squared error (MSE) of the nonlinear ultrasonic modulation method was improved by 41% compared with the nonlinear harmonics method. The nonlinear ultrasonic modulation method can successfully detect debonding defects in hidden frame supported glass curtain walls at different temperatures and impact.

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“…The relationship between the β parameter and the growth of fatigue crack has been previously examined, and it has been reported that the β parameter tends to increase as the fatigue crack grows. 32,33 The variation of the β parameter under constant-amplitude cyclic loading is presented in Figure 2(a). The β parameter initially increases as the crack grows and suddenly decreases immediately before the failure.…”

Section: Nonlinear Parameter For Fatigue Crack Assessmentmentioning

confidence: 99%

Online fatigue crack prognosis using nonlinear ultrasonic modulation

Lim

Sohn

2019

Structural Health Monitoring

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This article presents an online remaining fatigue life estimation (prognosis) technique using nonlinear ultrasonic modulation. When two ultrasonic inputs at two distinct frequencies are introduced to a structure with a fatigue crack, modulation components at the sum and difference of input frequencies are generated owing to crack opening and closing. First, a fatigue index is defined for prognosis and extracted from nonlinear ultrasonic modulation measurement. Subsequently, it is shown that the fatigue index is expressed as a simple power function of loading cycles applied to a target structure based on the Nazarov–Sutin and Paris–Erdogan theories. Then, the real-time remaining fatigue life estimation method is proposed by fitting the power function to online data obtained from the target structure. The performance of the proposed prognosis technique is evaluated using either notched or welded aluminum (6061-T6) plate specimens.

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Quantitative evaluation of micro-cracks using nonlinear ultrasonic modulation method

Cited by 62 publications

References 40 publications

In situ measurement of fatigue crack opening stresses by nonlinear vibro-acoustic modulation testing

In situ measurement of fatigue crack opening stresses by nonlinear vibro-acoustic modulation testing

Debonding Detection in Hidden Frame Supported Glass Curtain Walls Using the Nonlinear Ultrasonic Modulation Method with Piezoceramic Transducers

Online fatigue crack prognosis using nonlinear ultrasonic modulation

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