&lt;title&gt;Real-time monitoring of acoustic linear and nonlinear behavior of titanium alloys during low-cycle fatigue and high-cycle fatigue&lt;/title&gt;

Frouin, J.; Sathish, Shamachary; Na, Jeong K.

doi:10.1117/12.385477

Cited by 12 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous nonlinear acoustic studies have confirmed dependence of the nonlinear acoustic parameter on material constitution and aging processes including fatigue. Investigations on these subjects were reported by Breazile (1984), Nagy (1998), Cantrell and Yost (2001), Na et al (2003), Donskoy et al, (2006), Frouin et al (2000), Kim et al (2004), Courtney et al, (2007) and many others. Recent research indicates focus on utilizing nonlinear acoustic features for damage prognosis and on realization of nonlinear ultrasonics in the embeddable format.…”

Section: Nonlinear Structural Damage and Its Acoustic Manifestationmentioning

confidence: 88%

Active sensing of fatigue damage using embedded ultrasonics

2009

View full text Add to dashboard Cite

Embedded ultrasonics has demonstrated considerable utility in structural health monitoring of aeronautical vehicle. This active sensing approach has been widely used to detect and monitor cracks, delaminations, and disbonds in a broad spectrum of metallic and composite structures. However, application of the embedded ultrasonics for active sensing of incipient damage before fracture has received limited attention. The aim of this study was to investigate the suitability of embedded ultrasonics and nonlinear acoustic signatures for monitoring pre-crack fatigue damage in aerospace structural material. A harmonic load was applied to structural specimens in order to induce fatigue damage accumulation and growth. Specimens of simple geometry were considered and piezoelectric active sensors were employed for generation and reception of elastic waves. The elastic wave signatures were analyzed in the frequency domain using nonlinear impedance and nonlinear resonance methods. A relationship between fatigue severity and linear as well as nonlinear acoustic signatures was investigated and considered in the damage classification procedure. Practical aspects of the active sensing of the fatigue damage before fracture were discussed and prospective avenues for future research were suggested.

show abstract

Section: Nonlinear Structural Damage and Its Acoustic Manifestationmentioning

confidence: 88%

Active sensing of fatigue damage using embedded ultrasonics

2009

View full text Add to dashboard Cite

show abstract

“…Their results revealed that (a) the nonlinear parameter was far more sensitive to the internal damage than the sound speed and the damping ratio (b) decreasing of the sample's stiffness during the fatigue test correlated with manifestation of material damage via the nonlinear acoustic parameter. The nonlinear acoustic response of aircraft-grade materials during fatigue tests was investigated by Cantrell and Yost (2001) and Frouin et al, (2000). Cantrell and Yost (2001), studied dislocation dipole substructure formed during fatigue of an aluminum alloy and associated increase of the nonlinear parameter at the early stage of fracture with monotonic increase of volume fraction of persistent slip bands.…”

Section: Nonlinear Acoustic Assessment Of Materials Damagementioning

confidence: 99%

Micro/meso scale fatigue damage accumulation monitoring using nonlinear acoustic vibro-modulation measurements

et al. 2006

View full text Add to dashboard Cite

Monitoring the incipient damage at the earliest possible stage is essential for predicting structural performance and remaining life of structural components. Existing prognostic methodologies incorporate conventional SHM and NDE techniques responsive to cracks and delaminations resulted from the irreversible material fracture and disintegration at the macro-scale. There is an increasing need for technologies that could allow for monitoring material degradation at the micro/meso scale before the onset of the macro-scale fracture. In this contribution, we report results of the real-time monitoring of the material micro/meso scale degradation using the nonlinear acoustic vibro-modulation technique. The technique explores nonlinear acoustic interaction of high frequency ultrasound and low frequency structural vibration at the site of the incipient damage. The indicator of the damage severity, nonlinear acoustic damage index (DI), was measured in real time during the strain-controlled three-point bending fatigue test of aluminum and steel specimens. Nondestructively, degradation of the specimen was revealed through the increase in the DI, which correlated well with the respective decrease in the specimen's stiffness. Destructive SEM examination confirmed sensitivity of the DI to the incipient micro/meso scale damage and advocated for utilizing the vibro-modulation approach for assessment of material degradation before fracture.

show abstract

Nonlinear Acoustic Methods

Donskoy

2008

Encyclopedia of Structural Health Monitoring

View full text Add to dashboard Cite

The nonlinear acoustic technique (NAT) developed for detecting and characterizing structural and material defects is an emerging field with unique advantages and challenges. NAT exploits nonlinear dynamic behavior produced by contact interfaces and micro‐ and mesoscopic inhomogeneities associated with structural defects and damages including cracks, disbonds, and delaminations. Nonlinearities across the defects lead to noticeable nonlinear transformations of the interrogating acoustic signals such as harmonic distortions, frequency mixing, modulations, etc. Digital signal processing is used to experimentally capture these transformations unlocking the potential of the NAT to monitor and characterize nonlinear defects and damages in a wide variety of materials and structures.

show abstract

<title>Real-time monitoring of acoustic linear and nonlinear behavior of titanium alloys during low-cycle fatigue and high-cycle fatigue</title>

Cited by 12 publications

References 0 publications

Active sensing of fatigue damage using embedded ultrasonics

Active sensing of fatigue damage using embedded ultrasonics

Micro/meso scale fatigue damage accumulation monitoring using nonlinear acoustic vibro-modulation measurements

Nonlinear Acoustic Methods

Contact Info

Product

Resources

About