Onset Time Determination of Acoustic and Electromagnetic Emission During Rock Fracture

Niccolini, Gianni; Xu, Jie; Manuello, A.; Lacidogna, Giuseppe; Carpinteri, A

doi:10.2528/pierl12070203

Cited by 36 publications

(19 citation statements)

References 20 publications

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“…The stress measurement precision using the TOF method depends on the accurate measurement of the ultrasonic wave TOF. The peak value method, the cross‐correlation‐based algorithm, and the Akaike Information Criterion have been employed to measure the ultrasonic wave TOF. In general, stress measurements using the Lcr wave method have been widely studied.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the L cr wave TOF and shear‐wave spectrum methods for the uniaxial absolute stress evaluation of steel members

Teng

et al. 2019

Struct Control Health Monit

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The absolute stress of steel members is a key parameter for determining the performance of steel structures. Compared with other nondestructive evaluation methods, ultrasonic methods, which correlate material stress with ultrasonic velocity, have received the greatest amount of research attention. In this study, we investigated the measurement of the absolute stress distribution of steel members using two ultrasonic methods: a longitudinal critically refracted (Lcr) wave method and a shear wave method. The Lcr wave is generated from the longitudinal wave mode conversion and exhibits the greatest sensitivity to stress. The shear waves are generated by the birefringence effect, and their synthesis signal spectrum exhibits a minimum that varies with stress. A comparison of the two absolute stress evaluation methods is performed. Specifically, four steel members with identical dimensions and materials are used to investigate the discreteness of the calibrated parameters. The uniaxial absolute stress distributions of two steel members with variable cross sections are measured using the two methods and verified using the traditional strain gauge method. The results show that the uniaxial stress distributions of the two steel members can be evaluated by both the Lcr wave time-of-flight method and the shear-wave spectrum method, although the latter is more accurate for the measurement of stress distribution. Furthermore, the measurement principles, parametric calibrations, sensitivity, accuracy, and repeatability of the two methods are compared, and their applicability is discussed. KEYWORDS acoustoelastic effect, birefringence effect, Lcr wave TOF method, nondestructive stress measurement, shear-wave spectrum method, steel members, uniaxial absolute stress

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Section: Introductionmentioning

confidence: 99%

Comparison of the L cr wave TOF and shear‐wave spectrum methods for the uniaxial absolute stress evaluation of steel members

Teng

et al. 2019

Struct Control Health Monit

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“…In addition, the time dependence of the structural damage observed during the monitoring period, identified by parameter Á, can also be correlated to the rate of propagation of the micro-cracks. If we express the ratio between the cumulative number of AE counts recorded during the monitoring process, N, and the number obtained at the end of the observation period, N d , as a function of time, t, we get the damage time dependence on AE [5,32]:…”

Section: Damage Level and Damage Acceleration: Cumulated Ae Andˇt Expmentioning

confidence: 99%

Acoustic Emission Monitoring of Rock Specimens During Fatigue Tests

Zhou

Manuello

Lacidogna

et al. 2014

Fracture, Fatigue, Failure, and Damage Evolution, Volume 5

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Some of the most significant civil and historical structures, such as bridges, viaducts, dams and ancient monumental buildings, may collapse below the critical loading conditions due to fatigue effects. In the present paper, damage level evolution during fatigue tests of rock specimens will be evaluated by Acoustic Emission technique (AE). The fundamental parameters of AE will be analyzed in order to interpret the damage level evolution. The relationships between the cumulative AE counts and the damage accumulation during fatigue experiments will be considered for different kinds of iron-rich rocks (granite, basalt, magnetite). The achievement of critical conditions will be recognized through synthetic parameters based on AE, such as the b-value of the Gutenberg-Richter law and considering the increase in low-frequency components during the damage accumulation.

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“…These recent events lead to the conclusion that a large number of structures need reliable, periodic, low cost monitoring and inspection procedures, easy to be implemented. During the last few years the AE technique has been used during long-term monitoring in order to analyze the time evolution of microcracking phenomena (Yoon et al 2007;Ohtsu 1996;Pollock 1973;Brindley et al 1973;Grosse et al 2003;Carpinteri et al 2005;Shah and Li 1994;Carpinteri et al 2007;Niccolini et al 2012). According to this technique, it is possible to detect the onset and the evolution of stress-induced cracks.…”

Section: Real Time Monitoring Of Buildings For Seismic Damage Scenarimentioning

confidence: 99%

Resilience, Vulnerability and Prevention Policies of Territorial Systems in Areas at High Seismic Risk

Teramo

Rafanelli

Poscolieri

et al. 2015

Earthquakes and Their Impact on Society

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Onset Time Determination of Acoustic and Electromagnetic Emission During Rock Fracture

Cited by 36 publications

References 20 publications

Comparison of the L cr wave TOF and shear‐wave spectrum methods for the uniaxial absolute stress evaluation of steel members

Comparison of the L cr wave TOF and shear‐wave spectrum methods for the uniaxial absolute stress evaluation of steel members

Acoustic Emission Monitoring of Rock Specimens During Fatigue Tests

Resilience, Vulnerability and Prevention Policies of Territorial Systems in Areas at High Seismic Risk

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