Concrete-Galvanized Steel Pull-Out Bond Assessed by Acoustic Emission

2016 ◽  
Vol 28 (2) ◽  
pp. 04015109 ◽  
Author(s):  
Antolino Gallego ◽  
Amadeo Benavent-Climent ◽  
Elisabet Suarez
Keyword(s):  
Acoustic Emission ◽  
Galvanized Steel ◽  
Pull Out

Effects of different pull-out loading rates on mechanical behaviors and acoustic emission responses of fully grouted bolts

2021 ◽  
Vol 28 (7) ◽  
pp. 2052-2066
Author(s):  
Yun-lou Du ◽  
Guo-rui Feng ◽  
Hong-pu Kang ◽  
Yu-jiang Zhang ◽  
Xi-hong Zhang
Keyword(s):  
Acoustic Emission ◽  
Mechanical Behaviors ◽  
Loading Rates ◽  
Pull Out ◽  
Grouted Bolts

scholarly journals Experimental investigation of pretensioned bolts under cyclic loading: Damage assessment using acoustic emission

2019 ◽  
Vol 15 (5) ◽  
pp. 155014771984935 ◽  
Author(s):  
Tieliang An ◽  
Xigui Zheng ◽  
Dengxing Zhu ◽  
Deyu Qian ◽  
Yu Guo ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Cyclic Loading ◽  
Cyclic Load ◽  
Loading Path ◽  
Loading Frequency ◽  
Damage Factor ◽  
Acoustic Emission Energy ◽  
Pull Out ◽  
Anchorage System ◽  
The Relationship

Understanding the acoustic emission effects on bolts under cyclic loading is of great significance for the support of roadways. The presented research focuses on the acoustic emission characteristics of bolts under cyclic loading. The following main conclusions were drawn: (1) With a higher loading frequency, the acoustic emission counts rate increases, while the total energy released in a given cyclic loading path decreases. (2) A fitting formula is established according to the relationship between the tension amplitude and cumulative acoustic emission counts, which can analyze the tension magnitude level of the cyclic load. (3) A damage factor for a cyclic load is proposed based on the acoustic emission counts generated during the cyclic and monotonic loading process that can analyze the degree of damage to the anchorage system caused by the cyclic load. (4) Based on the spatial distribution of the acoustic emission orientation points and the acoustic emission energy generated during the pull-out process, the acoustic emission damage evolution process of the anchorage specimens is deduced, and the mechanism of the high stability of the pretension anchorage system after cyclic loading is analyzed. The above conclusions may provide some experimental references for the application of acoustic emission technology in bolts supporting roadways.

The Use of Acoustic Emission for Leak Detection in Steel Pipe

2015 ◽  
Vol 771 ◽  
pp. 88-91
Author(s):  
I.B. Ardhana Putra ◽  
Iwan Prasetiyo ◽  
Dewi Permata Sari
Keyword(s):  
Acoustic Emission ◽  
Detection System ◽  
Propagation Constant ◽  
Leak Detection ◽  
Galvanized Steel ◽  
Steel Pipe ◽  
Experimental Result ◽  
Digital Oscilloscope ◽  
Ae Signal ◽  
Experimental Rig

A leak detection system using acoustic emission methods is developed. For this, an experimental rig to detect leak was built using 8” galvanized steel pipe. The length of the pipe is 2 meters. A leak was made with 3 mm diameter and located in 1 meter from the end pipe. The pipe was filled with water and compressed until certain pressure reached. An acoustic emission transducer from Brüel and Kjær type 8313 is mounted on the pipe wall and connected to digital oscilloscope to detect AE signal. The experiment conducted by placing a sensor at a distance of 15 cm, 30 cm, 45 cm, 60 cm, and 75 cm from the position of the leak. Measurements were also performed with the variation of the pressure 3 bar, 4 bars, 5 bars, 6 bars, and 7 bar for those points.Considering acoustic emission wave travelling on pipe is plane wave, leak detection using energy attenuation emission become possible that is different from the method commonly used. Propagation constant is thus required and obtained based on experimental result where the amplitude varies with the spatial and pressure. It is found that for the case considered here. Subsequently, distance of leak location can be determined by the propagation constant and the ratio of energy. Using this method, the error of prediction is about 15.8 %.

Coating adherence in galvanized steel assessed by acoustic emission wavelet analysis

2005 ◽  
Vol 52 (10) ◽  
pp. 1069-1074 ◽  
Author(s):  
Antolino Gallego ◽  
José F. Gil ◽  
Juan M. Vico ◽  
José E. Ruzzante ◽  
Rosa Piotrkowski
Keyword(s):  
Acoustic Emission ◽  
Wavelet Analysis ◽  
Galvanized Steel

Acoustic emission monitoring for bond integrity evaluation of reinforced concrete under pull-out tests

2016 ◽  
Vol 20 (9) ◽  
pp. 1390-1405 ◽  
Author(s):  
Ahmed A Abouhussien ◽  
Assem AA Hassan
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Acoustic Emission Signal ◽  
Concrete Structures ◽  
Signal Strength ◽  
Concrete Cover ◽  
Reinforced Concrete Structures ◽  
Bond Behavior ◽  
Emission Signal ◽  
Pull Out

This article presents the results of an experimental investigation on the application of acoustic emission technique for monitoring the steel-to-concrete bond integrity of reinforced concrete structures. A series of direct pull-out tests were performed on 54 reinforced concrete unconfined prism samples with variable rebar diameter (10, 20, and 35 mm), embedded length (50, 100, and 200 mm), and concrete cover (20, 30, and 40 mm). The samples were tested under incrementally increasing monotonic loading while being continuously monitored via attached acoustic emission sensors. These sensors were utilized to acquire different acoustic emission signal parameters emitted throughout the tests until failure. Also, an acoustic emission intensity analysis was implemented on acoustic emission signal strength data to quantify the damage resulting from loss of bond in all tested specimens. This analysis employed the signal strength of all recorded acoustic emission hits to develop two additional parameters: historic index ( H ( t)) and severity ( Sr). The results of bond behavior, mode of failure, and free end slip were compared with the recorded acoustic emission data. The results showed that the cumulative number of hits, cumulative signal strength, H ( t), and Sr had a good correlation with different stages of bond damage from de-bonding/micro-cracking until bond splitting failure and bar slippage, which caused cover cracking or delamination. The analysis of cumulative signal strength and H ( t) curves enabled early identification of two progressive stages of bond degradation (micro-cracking and macro-cracking) and recognized the various modes of failure of the tested specimens. The variations of bar diameter, concrete cover, and embedded length yielded significant impacts on both the bond behavior and acoustic emission activities. The results also presented developed intensity classification charts, based on H ( t) and Sr, to assess the bond integrity and to quantify the bond deterioration (micro-cracking, macro-cracking, and rebar slip) in reinforced concrete structures.

scholarly journals Corrosion Resistance of Galvanized Steel in the Environment of a Bioreactor

2016 ◽  
Vol 19 (2) ◽  
pp. 29-32
Author(s):  
Michal Šustr ◽  
Petr Dostál ◽  
Jaroslav Začal
Keyword(s):  
Acoustic Emission ◽  
Corrosion Resistance ◽  
Surface Layer ◽  
Aluminium Alloy ◽  
Galvanized Steel ◽  
Filler Material ◽  
Innovative Technology ◽  
Acoustic Emission Method ◽  
Hardness Testing ◽  
Emission Method

Abstract The article deals with monitoring the corrosion resistibility of welded materials in the anaerobic fermenter (bioreactor). The main goal of this research is to assess the change of hardness after degradation. The change of hardness occurs in the corrosion environment and it correlates with the corrosion resistibility of material. The purpose of this experiment is to recognize the possibilities of using the CMT welded materials in the defined environment. As an innovative technology the acoustic emission method is used for assessment of surface layer disruption during hardness testing. Aluminium alloy with galvanized steel (AluZinc) was used as an experimental material. The basic materials were welded by the filler material AlSi3.

EFFECTS OF HEAT TREATMENT ON THE TENSILE BEHAVIOR AND DAMAGE EVOLUTION OF A 3D C/SIC COMPOSITE

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2591-2596
Author(s):  
YIQIANG WANG ◽  
LITONG ZHANG ◽  
LAIFEI CHENG
Keyword(s):  
Heat Treatment ◽  
Acoustic Emission ◽  
Damage Evolution ◽  
Tensile Behavior ◽  
Matrix Cracking ◽  
Lower Strength ◽  
Strain Behavior ◽  
Pull Out ◽  
Final Failure ◽  
Fiber Preforms

The tensile responses and the associated damage evolutions of a 3D C / SiC composite with and without heat treatment on the fiber preforms were compared. The results show that the composite without heat treatment exhibits a largely non-linear stress-strain behavior up to rupture as well as a lower strength and a strain-to-failure. The damage evolution characterized by acoustic emission indicates the composite failures in the region of matrix cracking multiplication. However, the composite with heat treatment has a larger strength and a strain-to-failure, and the damage evolution indicates that the composite had experienced the region of matrix cracking saturation and then fiber bundle pull-out just prior to final failure. Microstructural observations on the fractured specimens revealed the interfacial bonding between fibers and matrix becomes weaker after heat treatment.

scholarly journals Prediction of fiber breakage and matrix cracking in polymeric composites under low-cycle fatigue regimes by fuzzy and wavelet clustering of acoustic emission signals

2021 ◽  
Author(s):  
Sattar Mohammadi Esfarjani ◽  
Mohammad Azadi ◽  
Mohsen Alizadeh ◽  
Hassan Sayar
Keyword(s):  
Acoustic Emission ◽  
Composite Structures ◽  
Mechanical Test ◽  
Low Cycle Fatigue ◽  
Polymeric Composites ◽  
Matrix Cracking ◽  
Fiber Breakage ◽  
Cycle Fatigue ◽  
Emission Data ◽  
Pull Out

Abstract One of methods for detecting cracks and estimating their growth in materials such as composites is the acoustic emission technique. The detection of damages, cracks and their growth in industrial composite structures, under static and dynamic loads, has a significant importance, in order to prevent any damages and increase the reliability. Therefore, achieving required technical knowledge in this field, can be helpful in repairing and the maintenance of the part in industries. The prediction of the damage in polymeric composites under static loads has been already investigated by researchers; however, under cyclic loadings, researches about this behavior are still rare. In this study, by acoustic emission sensors and analyzing experimental data, the damage, including matrix cracking, the fiber breakage and other damages (debonding, fiber pull-out and delamination) during dynamic loading was investigated. At the first stage, standard specimens were made by the pure resin epoxy and the pure carbon fiber, subjected to monotonic tensile loading and then, the frequency of the failure was extracted. Then, composite specimens were loaded in the low-cycle fatigue regime. Mechanical test results and acoustic emission data were analyzed by fuzzy C-Means and wavelet transform methods and then compared to each other to find the percentage of failures in first, mid- and last cycles by the differentiation of failure types. Results clearly indicated that the acoustic emission approach is useful and an effective tool for identifying and detecting damages in polymeric composites.

scholarly journals Application of Acoustic Emission on the Characterization of Fracture in Textile Reinforced Cement Laminates

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
J. Blom ◽  
J. Wastiels ◽  
D. G. Aggelis
Keyword(s):  
Acoustic Emission ◽  
Process Zone ◽  
Peak Load ◽  
Matrix Cracking ◽  
Fracture Mechanisms ◽  
Stress Modeling ◽  
Pull Out ◽  
Reinforced Cement ◽  
The Moment ◽  
Real Time Information

This work studies the acoustic emission (AE) behavior of textile reinforced cementitious (TRC) composites under flexural loading. The main objective is to link specific AE parameters to the fracture mechanisms that are successively dominating the failure of this laminated material. At relatively low load, fracture is initiated by matrix cracking while, at the moment of peak load and thereafter, the fiber pull-out stage is reached. Stress modeling of the material under bending reveals that initiation of shear phenomena can also be activated depending on the shape (curvature) of the plate specimens. Preliminary results show that AE waveform parameters like frequency and energy are changing during loading, following the shift of fracturing mechanisms. Additionally, the AE behavior of specimens with different curvature is very indicative of the stress mode confirming the results of modeling. Moreover, AE source location shows the extent of the fracture process zone and its development in relation to the load. It is seen that AE monitoring yields valuable real time information on the fracture of the material and at the same time supplies valuable feedback to the stress modeling.

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