Fracture process zone size and true fracture energy of concrete using acoustic emission

Muralidhara, Srinivasa; Prasad, B.K. Raghu; Eskandari, Hamid; Karihaloo, Bhushan Lal

doi:10.1016/j.conbuildmat.2009.10.014

Cited by 193 publications

(66 citation statements)

References 25 publications

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“…Labuz et al (2001) quantified the intrinsic process zone in cementitious specimens of various size subjected to diametral compression (Brazilian-disc test) and 3PB. The dimensions of the fracture process zone based on the location of the acoustic events were determined also for rock specimens (Muralidhara et al, 2010). Another very interesting application of the AE technique is the estimation of the critical values of the SIF and the J-integral, dated back to 1984 (Blanchette et al, 1984).…”

Section: Acoustic Emissionsmentioning

confidence: 99%

Mechanical response of notched marble beams under bending versus acoustic emissions and electric activity

Kourkoulis

Pasiou

Dakanali

et al. 2018

jtam

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An experimental protocol, including the combined application of both innovative and traditional sensing techniques, is described aiming to explore the mechanical response of marble and also to check the possibilities of detecting precursor phenomena designating upcoming catastrophic fracture. The protocol consisted of three-point bending tests with notched prismatic beams made of Dionysos marble, the material extensively used for restoration of the Acropolis of Athens monuments. The sensing system improvised included techniques relying on completely different physical foundations, which permit simultaneous detection and recording of the Pressure Stimulated Currents, Acoustic Emissions, three dimensional displacement fields and Notch Mouth Opening Displacements. Analysis of the results revealed interesting features of the mechanical response of Dionysos marble and indicated, also, that classical Continuum Fracture Mechanics fails to describe accurately the response of marble, at least in the presence of notches. In addition, strong correlations between the Pressure Stimulated Currents, the rate of acoustic hits and the rate of change of the opening of the pre-existing notch have been enlightened. Moreover, the onset of catastrophic crack propagation appears following distinguishable changes of the Pressure Stimulated Currents recorded. Therefore (and taking into account the very small size of the respective sensors as well as the simple complementary equipment needed), it is concluded that the specific technique could be considered as a simple and reliable tool for an alternative approach to the in-situ Structural Health Monitoring of classical stone monuments.

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Section: Acoustic Emissionsmentioning

confidence: 99%

Mechanical response of notched marble beams under bending versus acoustic emissions and electric activity

Kourkoulis

Pasiou

Dakanali

et al. 2018

jtam

View full text Add to dashboard Cite

show abstract

“…Alternatively, the characterization of the damage domain can also be obtained by means of a statistical analysis of the distribution of AE events in a single test [22]. From the viewpoint of energy dissipation and emission, the cumulative number of AE events and the energy content of the AE events are usually correlated to the mechanical energy dissipated during the complete failure process: namely, fracture energy in tension and crushing energy in compression [23,24].…”

Section: Dissipated and Emitted Energiesmentioning

confidence: 99%

Acoustic Emission and Modal Frequency Variation in Concrete Specimens under Four-Point Bending

2017

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Abstract:The Acoustic Emission (AE) and Dynamic Identification (DI) techniques were applied simultaneously, in an original way, to examine the stress dependent damage progress in pre-notched concrete beams tested in four-point bending. The damage mechanisms were characterized by analyzing the AE signals registered during the tests, conducted by increasing the specimen's vertical deflection. In particular, the dominant fracture mode was identified, and correlations between dissipated and emitted energies were investigated. Moreover, variations in the natural bending frequencies, produced by the crack advancement under loading, were detected and put in relation with the cumulated AE energy. Two different types of piezoelectric (PZT) sensors, operating in well distinct frequency ranges, were used to measure AE and modal signals. This study may be of interest with an outlook on possible correlations between a multi-parameter structural monitoring and the solution of inverse problems by numerical models.

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“…Piezoelectric sensors are mounted on the surface of the material or structure to record the motion of the surface under the elastic excitation of the cracking sources [5]. The rate and the characteristics of the received signals are strongly dependent on the damage process and enable the monitoring of fracture, corrosion and healing in cementitious materials [6]. There are two different ways to analyze cracks.…”

Section: Introductionmentioning

confidence: 99%

Flexure response of thermal loaded concrete specimens by acoustic emission method

et al. 2017

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Abstract. The response to fire of concrete structural members depends on the thermal, mechanical, and deformation properties of concrete. These properties vary significantly with temperature depending on the composition and characteristics of the concrete batch mix as well as heating rate and other environmental conditions. The paper presents the effects of a high temperature on selected physical properties of concrete. The main aim of the article is the evaluation of monitoring concrete properties loaded in a few thermal steps up to 1200 °C. Therefore, the concrete specimens were heated in a programmable laboratory furnace at a heating rate of 5 °C/min. The specimens were loaded at six temperatures, 200 °C, 400 °C, 600 °C, 800 °C, 1000 °C, and 1200 °C maintained for 60 minutes. The acoustic emission activity and some material characteristics were evaluated in a three-point bending test.

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Fracture process zone size and true fracture energy of concrete using acoustic emission

Cited by 193 publications

References 25 publications

Mechanical response of notched marble beams under bending versus acoustic emissions and electric activity

Mechanical response of notched marble beams under bending versus acoustic emissions and electric activity

Acoustic Emission and Modal Frequency Variation in Concrete Specimens under Four-Point Bending

Flexure response of thermal loaded concrete specimens by acoustic emission method

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