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Acoustic Emission - Astrophysics Data System

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Last Updated: 03 December 2022

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Acoustic Emission Source Characterisation during Fatigue Crack Growth in Al 2024-T3 Specimens

The main contribution of this research is that it provides a way to establish a more continuous correlation of count rate with crack growth rate based on waveform. This paper seeks to identify AE sources by synchronizing the AE waveforms with load levels and then to suggest potential dominant frequency ranges. In fatigue crack growth in edge-notched 2024-T3 aluminium specimens from 10 mm to 70 mm, a meter crack was recorded at two different load ratios R = 0. 125 and 0. 5. The most common frequency range of the AE waveforms directly related to crack growth was also found, at 152 kHz, u2013316 kHz, and 500 kHz, according to crack closure. Based on the available frequency ranges, waveform analysis was performed, and a more linear relationship between count rate and crack growth rate was found.

Source link: https://ui.adsabs.harvard.edu/abs/2022Senso..22.8796Y/abstract


Current Tectonic Stress State in an Iron Mine District, North China, Based on Overcoring, Hydraulic Fracturing, and Acoustic Emission Stress Measurements

For determining open-pit mine slope stability and regional tectonic evolution and geodynamic processes, complete knowledge of the current tectonic stress state is critical. Twenty sets of stress data ranging from 56 to 490 m were measured in an iron mine district, North China, and three sets of stress measurement methods were used to determine the 3D stress tensor in an iron mine district, North China. The stress directions derived from various methods were virtually similar, indicating a dominant NEE-u2013SW stress field direction or near-Eu2013W direction, comparable to focal mechanism solutions and other stress indicators around the mine district, indicating a consistent NEEu2013SW stress field direction or near-Eu2013W direction.

Source link: https://ui.adsabs.harvard.edu/abs/2022Lsphe202251234L/abstract


(Digital Presentation) Lifetime Prediction of SiC Power Module By Using Time-Series Analysis of Acoustic Emission during Power Cycling Test

In several regions, acous emission based condition monitoring is a common way to determine a material health state. [1] In comparison, AE signals give significant information such as increase time, AE energy, and AE peak frequency, which are representative of the failure process. The AE technology has been used to condition monitoring of power modules for the last decade and has shown a promising application scenario in the power electronics industry, allowing us to get real failure data and making precise perdition of a failure in the power module[2].

Source link: https://ui.adsabs.harvard.edu/abs/2022ECSMA2022.1356Z/abstract


How a Li-Ion Battery Talks: Electrochemical and Mechanical Behaviors of the Battery Using in-Operando Acoustic Emission

Degradation of a Li-ion battery requires several processes that are tightly coupled to each other. However, it's also unknown how various types of AE signals are related to electrochemical and mechanical events that occur inside the battery. Here, we discuss our attempts to develop an in-depth acoustic analysis to compare several forms of AE waveforms with electrochemical and mechanical characteristics of the battery using a commercially used battery pouch cell. To get the frequency spectra of the AE sources, the hits from the AE events were analyzed using waveforms and their Fast Fourier Transform.

Source link: https://ui.adsabs.harvard.edu/abs/2022ECSMA2022.2567H/abstract


Characterization of Damage Progress in the Defective Grouted Sleeve Connection Using Combined Acoustic Emission and Ultrasonics

Prefabricated buildings are also one of the most popular prefabricated building connections, the grouted sleeve connector. Therefore, it is imperative to know the consequences of the defective grouted sleeve joint. Hence, this paper recommends a combined acoustic emission and ultrasonic testing technique to quantify the damage caused by a grouted sleeve with different degrees of internal defects under tensile loading. During the tensile testing, the AE was also used as the processing monitoring device. Two damage modes were identified: the brittle mode associated with the rebar pullout; ductile mode associated with the rapture of the rebar. The AE signatures of various attack phases and various damage modes were identified and characterized. The proposed combined AE and UT technique would provide a fast and convenient nondestructive analysis of grouted sleeves with internal flaws. Moreover, it can also measure the harm that the grouted sleeve links have caused in real-time.

Source link: https://ui.adsabs.harvard.edu/abs/2022Senso..22.8579Z/abstract


Test-Retest Reliability of Acoustic Emission Sensing of the Knee during Physical Tasks

This paper discusses the knee measurement during physical activities, including cycling, knee lifts, and single-leg squats. For increased test accuracy, test reliability, measurement consistency across multiple recordings and minimizing the influence of motion artifacts are both essential for increased test quality. The findings of this research show that movement consistency across multiple recordings is essential for improved test stability. Motion artifact resistant sensor mounting and the use of baseline movements to determine sensor attachment to evaluate sensor attachment could increase the sensing accuracy of AE methods, according to the study.

Source link: https://ui.adsabs.harvard.edu/abs/2022Senso..22.9027K/abstract


Modeling and Analysis of Acoustic Emission Generated by Fatigue Cracking

The acoustic emission method is a widely used and well-proportioned tool for passive structural health surveillance of metallic and composite structures. This paper discusses the basic acoustic emission signal from generation to reception, as well as provides an analytical framework for piezoelectric transducers under stress waves. A finite element technique simulates fatigue crack extension, and a pencil lead break experiment simulates the real acoustic emission caused by fatigue crack extension.

Source link: https://ui.adsabs.harvard.edu/abs/2022Senso..22.1208M/abstract


Non-Extensive Statistical Analysis of Acoustic Emissions Recorded in Marble and Cement Mortar Specimens Under Mechanical Load Until Fracture

NESM is used in this report to determine the acoustic emission events that occurred when marble and cement mortar specimens were subjected to mechanical loading until fracture. Tsallis entropy q-exponential function and the corresponding q-indices of tsallis entropy q/u03b4r and u03b4r were tested, along with the parameters u03b4u03b4r and dy 03b4r. Results show that AE data obtained from marble and cement mortar specimens of this research is in good agreement with the conduction discovered in seismological and AE data obtained from Basalt specimens.

Source link: https://ui.adsabs.harvard.edu/abs/2020Entrp..22.1115L/abstract


Quantitative Investigation of Acoustic Emission Waveform Parameters from Crack Opening in a Rail Section Using Clustering Algorithms and Advanced Signal Processing

Although studies on a simulated AE source in rail and testing on rail material using small beam samples have been conducted, a research is still needed in the laboratory to determine AE waveform characteristics caused by cracking in rail. A three-point bending test is carried out on an actual rail section of 1500 mm with transverse damage of 38 percent of the head region to mimic an AE source due to crack openings in the rail. Based on silhouette score, the k-mean with principal component was found to be the most effective tactic.

Source link: https://ui.adsabs.harvard.edu/abs/2022Senso..22.8643M/abstract

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions