Characteristic analysis of acoustic emission signals of masonry specimens under uniaxial compression test

Wu, Yanqi; Li, Shengli; Wang, Dongwei

doi:10.1016/j.conbuildmat.2018.11.148

Cited by 35 publications

(12 citation statements)

References 31 publications

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“…Other studies deal with different materials, such as water-saturated ceramics ( [47], this study utilizes equipment from the same manufacturer as in the manuscript submitted by us) or materials for asphalt roads, see [48]. However, the acoustic emission method is typically used to compare the behaviour of materials after F-T cycles during mechanical loading, which is described, for example, in [49][50][51][52]. No other known study showed a frequency analysis of individual AE hits that recorded directly during F-T cycles.…”

Section: Discussionmentioning

confidence: 99%

Analysis of Acoustic Emission Signals Recorded during Freeze-Thaw Cycling of Concrete

et al. 2021

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This manuscript deals with a complex analysis of acoustic emission signals that were recorded during freeze-thaw cycles in test specimens produced from air-entrained concrete. An assessment of the resistance of concrete to the effects of freezing and thawing was conducted on the basis of a signal analysis. Since the experiment simulated testing of concrete in a structure, a concrete block with the height of 2.4 m and width of 1.8 m was produced to represent a real structure. When the age of the concrete was two months, samples were obtained from the block by core drilling and were subsequently used to produce test specimens. Testing of freeze-thaw resistance of concrete employed both destructive and non-destructive methods including the measurement of acoustic emission, which took place directly during the freeze-thaw cycles. The recorded acoustic emission signals were then meticulously analysed. The aim of the conducted experiments was to verify whether measurement using the acoustic emission method during Freeze-thaw (F-T) cycles are more sensitive to the degree of damage of concrete than the more commonly employed construction testing methods. The results clearly demonstrate that the acoustic emission method can reveal changes (e.g., minor cracks) in the internal structure of concrete, unlike other commonly used methods. The analysis of the acoustic emission signals using a fast Fourier transform revealed a significant shift of the dominant frequency towards lower values when the concrete was subjected to freeze-thaw cycling.

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Section: Discussionmentioning

confidence: 99%

Analysis of Acoustic Emission Signals Recorded during Freeze-Thaw Cycling of Concrete

et al. 2021

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“…The selection of these parameters affects the accuracy and reliability of AE monitoring results. 44 Therefore, before the experiment, pencil lead break (PLB) tests were performed on the surfaces of the steel wires. The AE rise times obtained from the PLB tests are listed in Table 3.…”

Section: Ae Monitoring Parametersmentioning

confidence: 99%

Corrosion evaluation of prestressed high‐strength steel wires with impressed current cathodic protection based on acoustic emission technique

Liang

Zhang

2022

Structural Contr & Hlth

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Summary The acoustic emission (AE) technique is a non‐destructive testing method widely used in various structural health monitoring fields, and it is highly sensitive to the emergence and development of material corrosion. This study developed a method of employing the AE technique to evaluate the corrosion degree of stay cable high‐strength steel wires under pre‐stress and impressed current cathodic protection (ICCP) in a simulated marine atmospheric rainwater environment. The variation characteristics of AE parameters under various pre‐stress levels and protection current densities were investigated. Results showed that the more negative the open circuit potentials (OCPs) and the greater the average corrosion rates, the higher the cumulative AE parameters. In the AE intensity analysis of corrosion damage for stay cable high‐strength steel wires, the constants J and the K were taken as 40 and 25 hits, respectively. The corrosion of steel wires was divided into no corrosion, slight corrosion, medium corrosion, and severe corrosion. The corrosion degree of specimens with ICCP was classified as no corrosion and slight corrosion, whereas that of unprotected specimens was classified as medium corrosion and severe corrosion.

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“…e AE system is shown in Figure 3(a). e AE time parameters-peak definition time (PDT), hit definition time (HDT), and hit lock time (HLT)-were set to 50 μs, 100 μs, and 200 μs, respectively [27,28]. e digital photogrammetry system used is Xi'an Jiaotong University Digital Close-range Industrial Photogrammetry System (XJTUDP), as shown in Figure 3(b).…”

Section: Test Equipment and Parametersmentioning

confidence: 99%

“…Acoustic emission (AE), as a dynamic nondestructive monitoring technique, is not only easy to install and operate but also capable of continuous monitoring and data collection. With these advantages, this technique has been widely used in structural state assessment, damage locating, and damage evolution detection [20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Crack Initiation and Propagation in the Unreinforced Masonry Specimen Subjected to Vertical Settlement

Wang

et al. 2021

Advances in Materials Science and Engineering

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To study the cracking process of the wall caused by differential settlement under a uniformly distributed load on the top of the wall, a laboratory model experiment was carried out on large-scale masonry specimens, and the acoustic emission (AE) technique and digital close-range industrial photogrammetry were adopted to monitor the AE signals and displacement characteristics of the masonry specimens during loading in real time. The results show that, in the case of differential settlement with small settlement on both sides and large settlement in the middle, two main cracks appear on the left and right sides of the wall, extending obliquely from bottom to top. During the loading process, damage of the wall is aggravated due to the differential settlement, and both cumulative ringing count and energy count have different periods of steep rise. With the increase in the load and activation of the AE event, the AE event becomes active, and the cumulative ringing count and cumulative energy curve have an obvious turning point, where the slope of the curve is substantially higher than that before the turning point. By using digital close-range industrial photogrammetry, it is observed that the main oblique crack on the left is mainly caused by the difference in the vertical deformation, while the main oblique crack on the right is caused by different displacements and deformation directions of the wall on both sides of the crack.

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Characteristic analysis of acoustic emission signals of masonry specimens under uniaxial compression test

Cited by 35 publications

References 31 publications

Analysis of Acoustic Emission Signals Recorded during Freeze-Thaw Cycling of Concrete

Analysis of Acoustic Emission Signals Recorded during Freeze-Thaw Cycling of Concrete

Corrosion evaluation of prestressed high‐strength steel wires with impressed current cathodic protection based on acoustic emission technique

Experimental Investigation of Crack Initiation and Propagation in the Unreinforced Masonry Specimen Subjected to Vertical Settlement

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