Study of fracture evolution in FRP-strengthened reinforced concrete beam under cyclic load by acoustic emission technique: An integrated mechanical-acoustic energy approach

Selman, Efe; Ghiami, Amir; Alver, Ninel

doi:10.1016/j.conbuildmat.2015.07.162

Cited by 45 publications

(13 citation statements)

References 28 publications

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“…Such a correlation points to the utility of AE signals for developing damage indices based on AE MARSE energy, as they are capable of assessing the damage in RC structures subjected to different types of loadings. An example of the damage index based on the correlation of the strain and acoustic energies is the Sentry function, proposed in [31], in terms of the logarithmic ratio of both energies. The reason why AE MARSE energy can be utilized for the establishment of damage indices in reinforced concrete (RC) elements is that the failure of RC structural elements is typically due to the degradation (damage) of concrete, not of the reinforcing steel.…”

Section: Discussionmentioning

confidence: 99%

Correlation of Plastic Strain Energy and Acoustic Emission Energy in Reinforced Concrete Structures

et al. 2016

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This paper presents a comparison of the acoustic emission (AE) energy and the plastic strain energy released by some reinforced concrete (RC) specimens subjected to cyclic or seismic loadings. AE energy is calculated, after proper filtering procedures, using the signals recorded by several AE low frequency sensors (25-100 kHz) attached on the specimens. Plastic strain energy is obtained by integrating the load displacement curves drawn from the measurements recorded during the test. Presented are the results obtained for: (i) two beams (with and without an artificial notch) and a beam-column connection subjected to several cycles of imposed flexural deformations; (ii) a reinforced concrete slab supported by four steel columns, and a reinforced concrete frame structure, both of the latter are subjected to seismic simulations with a uniaxial shaking table. The main contribution of this paper, which is a review of some papers previously published by the authors, is to highlight that, in all cases, a very good correlation is found between AE energy and plastic strain energy, until the onset of yielding in the reinforcing steel. After yielding, the AE energy is consistently lower than the plastic strain energy. The reason is that the plastic strain energy is the sum of the contribution of concrete and steel, while the AE energy acquired with thresholds higher than 35 dB AE captures only the contribution of the concrete cracking, not the steel plastic deformation. This good correlation between the two energies before the yielding point also lends credibility to the use of AE energy as a parameter for concrete damage evaluation in the context of structural health monitoring.

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Section: Discussionmentioning

confidence: 99%

Correlation of Plastic Strain Energy and Acoustic Emission Energy in Reinforced Concrete Structures

et al. 2016

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“…To complete this unsupervised pattern recognition approach, a global variable was used to focus on the relationship between the AE activity and the mechanical behaviour of the specimen. The Sentry Function (SF) was chosen because it combines both mechanical and acoustic energy information [31][32][33]. This function is defined by:…”

Section: Ae Data Processingmentioning

confidence: 99%

Mechanical behaviour and damage mechanisms analysis of a flax-fibre reinforced composite by acoustic emission

Monti

Mahi

Jendli³

et al. 2016

Composites Part A: Applied Science and Manufacturing

139

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This article presents the mechanical characterization of an eco composite consisting of a thermoplastic matrix reinforced by flax fibres. Different configurations of specimens were tested with uniaxial tensile loading and their mechanical behaviours were discussed. Moreover, the acoustic emission technique was used to detect the appearance of damage mechanisms and to follow their evolution. In addition, a list of these mechanisms was established by means of macroscopic and microscopic observations. The acoustic emission records were post processed by the k-means unsupervised pattern recognition algorithm. Depending on the specimen configuration, three or four classes of events were obtained. The acoustic characteristics of these classes were compared. Then, a correlation between these AE events classes and the damage mechanisms observed was proposed. Their effects on the mechanical behaviour of the material were investigated by means of a variable called the Sentry Function.

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“…Fibre reinforced composite materials are increasingly used in advanced lightweight applications as forecasted earlier [1], especially in the aerospace and space sector as well as automotive, civil engineering [2] and high-end sports industries [3,4]. Since the performance of engineering materials in service is usually different to what is expected of them, engineers are usually obliged to design structures and components to minimize the possibility of failure [5].…”

Section: Introductionmentioning

confidence: 99%

A simple and robust approach for visual overload indication - UD thin-ply hybrid composite sensors

Rev

Jalalvand

Fuller

et al. 2019

Composites Part A: Applied Science and Manufacturing

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A novel, purpose-designed, thin interlayer glass/carbon-epoxy hybrid composite sensor concept is presented here that can be used for structural health monitoring (SHM), offering potential for safer operation in service. The hybrid composite sensors indicate the overload of a structure by exhibiting a change in their appearance when loaded in tension over a predefined strain value. The sensors can be attached to a component either as a structural sensing layer or integrated locally as demonstrated in this study through real-life applications. Furthermore, various test methods have been utilised to characterise the bonded-on sensors including mechanical testing, Digital Image Correlation (DIC) and Acoustic Emission (AE) measurements. An optimal configuration has been identified with the utilised materials that 2 can potentially be used in applications such as sporting goods, civil engineering structures (e.g. truss and bridge elements) as well as pressure vessels.

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Study of fracture evolution in FRP-strengthened reinforced concrete beam under cyclic load by acoustic emission technique: An integrated mechanical-acoustic energy approach

Cited by 45 publications

References 28 publications

Correlation of Plastic Strain Energy and Acoustic Emission Energy in Reinforced Concrete Structures

Correlation of Plastic Strain Energy and Acoustic Emission Energy in Reinforced Concrete Structures

Mechanical behaviour and damage mechanisms analysis of a flax-fibre reinforced composite by acoustic emission

A simple and robust approach for visual overload indication - UD thin-ply hybrid composite sensors

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