Spectral damage index for estimation of breathing crack depth in an aluminum plate using nonlinear Lamb wave

Yelve, Nitesh P.; Mujumdar, P. P.

doi:10.1002/stc.1604

Cited by 25 publications

(30 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In the case of a linear material, frequency of the received wave signal is the same as that of the excited wave, whereas higher harmonics are observed in the received wave signal for a nonlinear material . The material nonlinearity is either inherent or damage induced.…”

Section: Materials Nonlinearity Estimation Using Lamb Wavesmentioning

confidence: 98%

Estimation of remaining useful life of fatigued plate specimens using Lamb wave‐based nonlinearity parameters

Tse

Masurkar

Yelve³

2020

Struct Control Health Monit

Self Cite

View full text Add to dashboard Cite

Summary The present study focuses on estimating material nonlinearity and consequently remaining useful life of fatigued specimens using the amplitude‐ and physics‐based material nonlinearity parameters evaluated for Lamb wave motion in plate specimens. The amplitude‐based nonlinearity parameter depends on amplitudes of the Lamb wave harmonics generated due to material nonlinearity. Here, it is employed to estimate the inherent and dislocation induced material nonlinearities for different stages of fatigue. The cumulative effect is obtained from the strict matching of phase and group velocities of the S1 − S2 mode pair. The physics‐based nonlinearity parameter is obtained from the higher order elastic coefficients, plastic coefficients, and substructural evolution parameters. It does not depend on wave propagation distance; however, it depends on percent fatigue life. Thus, it is used to construct a theoretical nonlinearity curve. A spectral amplitude normalization technique is given to systematically evaluate the material nonlinearity, once the Lamb wave data over different wave propagation distances are known either from experiments or from simulations. The values of amplitude‐based nonlinearity parameter thus estimated through the simulation and experiments for different fatigue stages are then plotted onto the obtained theoretical nonlinearity curve. A reasonably good agreement is seen between the fatigue life estimations given by both the nonlinearity parameters. Thus, the amplitude‐based nonlinearity parameter obtained from the Lamb wave response can be effectively used to estimate the remaining useful life of the fatigued plate specimens.

show abstract

Section: Materials Nonlinearity Estimation Using Lamb Wavesmentioning

confidence: 98%

Estimation of remaining useful life of fatigued plate specimens using Lamb wave‐based nonlinearity parameters

Tse

Masurkar

Yelve³

2020

Struct Control Health Monit

Self Cite

View full text Add to dashboard Cite

show abstract

“…The size of the elements must be sufficiently small for there to be at least 10 nodes per wavelength of the propagating wave. 15,16 Only A 0 and S 0 modes of Lamb wave are involved in the analysis and A0 mode has the smaller wavelength at 204 kHz which is 6.545 mm. Accordingly, the element size of 0.5 mm is used for the simulation.…”

Section: Finite Element Simulationmentioning

confidence: 99%

“…The accuracy in the integrations can be stated in terms of period elongation and amplitude decay. 15,16 In the FE simulation of Lamb wave propagation, both period elongation and amplitude decay affect the group velocity. Therefore, a convergence study is carried out as shown in Tables 1 and 2.…”

Section: Finite Element Simulationmentioning

confidence: 99%

Lamb Wave Based Experimental and Finite Element Simulation Studies for Damage Detection in an Aluminium and a Composite Plate using Geodesic Algorithm

Masurkar¹,

Yelve²

2017

IJAV

Self Cite

View full text Add to dashboard Cite

The present research focuses on localizing structural damages in an aluminium and a woven fabric composite laminate. Finite Element (FE) and experimental simulation studies are carried out on specimens of these plates with and without damages, and the response data are collected at various sensor locations. Piezoelectric wafer (PW) transducers are used for actuation and reception of Lamb wave. The group velocity dispersion curves obtained through the experiment and simulation are compared with those obtained analytically to ensure effective actuation and sensing of Lamb wave. A Continuous Wavelet Transform (CWT) is used for receiving the arrival times of the wave reflected from the damages to the sensor locations. After acquiring arrival time data, the geodesic algorithm is employed to locate the damage in the specimens. The geodesic algorithm used is a two-step strategy initially using the Pythagorean Theorem to find the discrete geodesics in the structure, using mesh information and followed by locating the intersections of these geodesics to get the damage locations. Herein, the geodesic algorithm is shown to be effective in detecting several damages in a plate, both experimentally and through FE simulation.

show abstract

“…The information about these features of the material can be obtained using ultrasonic waves. The ultrasonic waves propagating through such material produce additional wave components with frequencies multiple of the excitation frequency called as higher harmonics . The higher harmonics generation takes place in waves because of the material nonlinearity, classified as the classical nonlinearity .…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental evaluation of material nonlinearity in metal plates using Lamb waves

Yelve

Tse

Masurkar

2018

Struct Control Health Monit

Self Cite

View full text Add to dashboard Cite

Summary In this study, an equation is proposed considering Lamb wave motion in a plate in order to estimate the nonlinearity in plate material. The equation evaluates material nonlinearity in terms of amplitudes of the fundamental and second harmonics of Lamb waves. Because the Lamb wave second harmonic can be generated in a nonlinear material through the experiments or simulation, the proposed equation is practically useful to estimate the material nonlinearity. Accordingly, authors carried out experiments on pristine 1100‐H14 Aluminium (Al) specimens using Lamb waves and obtained their inherent material nonlinearity using the amplitude‐based equation. Additionally, authors obtained the value of inherent material nonlinearity in 1100‐H14 Al using the constitutive nonlinear stress‐strain relation containing higher order elastic constants. The material nonlinearity parameters estimated using the experimental results and amplitude‐based equation are then compared with that obtained using the constitutive nonlinear equation. The difference between the results is marginal. Thus, using amplitudes of the fundamental and second harmonics of Lamb waves obtained through the experiments, the proposed amplitude‐based equation can be used to estimate the material nonlinearity in metal plates with fair accuracy.

show abstract

Spectral damage index for estimation of breathing crack depth in an aluminum plate using nonlinear Lamb wave

Cited by 25 publications

References 25 publications

Estimation of remaining useful life of fatigued plate specimens using Lamb wave‐based nonlinearity parameters

Estimation of remaining useful life of fatigued plate specimens using Lamb wave‐based nonlinearity parameters

Lamb Wave Based Experimental and Finite Element Simulation Studies for Damage Detection in an Aluminium and a Composite Plate using Geodesic Algorithm

Theoretical and experimental evaluation of material nonlinearity in metal plates using Lamb waves

Contact Info

Product

Resources

About