Fracture process zone in concrete tension specimen

Otsuka, Koji; Date, Hidehumi

doi:10.1016/s0013-7944(99)00111-3

Cited by 313 publications

(147 citation statements)

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“…These findings were in agreement with literature studies, e.g., see [36,37]. Direct visual observation (when possible) and identification of the cracking mode by AE wave's RT analysis, as far as not supported by other survey methods such as digital image correlation [38] or X-ray diffraction analysis [39], was important; in fact, this allowed for the characterizing the cracking mode based on information obtained from a small number of sensors. force applied and the stress diffusion according to Saint Venant's principle, the central part of the intermediate span was mainly subjected to bending stresses (see Figure 7a).…”

Section: Resultssupporting

confidence: 90%

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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Section: Resultssupporting

confidence: 90%

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

2017

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“…Several works have focused on relating acoustic emission characteristics to the properties of the fracture process zone [11] and using AE source location analysis to evaluate damage localization [12,13]. In the present study, attention is focused on the evolution of the FPZ in the course of damage propagation.…”

Section: Experiments With Acoustic Emission Analysismentioning

confidence: 99%

Non‐local damage model with evolving internal length

Pijaudier‐Cabot

Haidar

Dubé

2004

Num Anal Meth Geomechanics

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SUMMARYA modified non-local damage model with evolving internal length, inspired from micromechanics, is developed. It is shown in particular that the non-local influence between two points in the damaged material depends on the value of damage at each of these points. The resulting weight function is nonsymmetric and truncated. Finite element results and strain localization analysis on a one-dimensional problem are presented and compared to those of the original non-local damage model. It is shown that in the course of damage localization, the incremental strain profiles expand according to the modified nonlocal model, instead of shrinking according to the original constitutive relation. Comparisons with experimental data on model materials with controlled porosity are also discussed. Acoustic emission analyses provide results with which the theoretical model is consistent qualitatively. This model also opens the path for durability mechanics analyses, where it has been demonstrated that the internal length in the non-local model should evolve with environmentally induced damage.

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“…However, its much proper estimation can be possibly performed based on experimental observations of FPZ using e.g. AE scanning (see below) or/and radiography [32][33][34]. Alternatively, analytical estimation of the FPZ extent based on matching the crack-tip stress state description and strength properties of the material (via proper failure criteria) might be also helpful for this task, see e.g.…”

Section: Experiments By Hoover Et Almentioning

confidence: 99%

Modelling of size and shape of damage zone in quasi-brittle notched specimens – analytical approach based on fracture-mechanical evaluation of loading curves

Klon¹,

Veselý²

2016

Frattura Ed Integrità Strutturale

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ABSTRACT. An analysis focused on capturing the phenomenon of quasibrittle fracture is presented. Selected parameters relevant for quasi-brittle fracture are evaluated and an assessment of their dependence on the size and shape of the test specimen is studied. Determination of these fracture characteristics is based on the records of the fracture tests on notched specimens, particularly from recorded loading diagrams. A method of separation of the energy amounts released for the propagation of the (effective) crack and that dissipated within the volume of a large nonlinear zone at the crack tip -the fracture process zone -is introduced and tested on selected data from experimental campaigns published in the literature. The work is accompanied with own conducted numerical simulations using commercial finite element code with implemented cohesive crack model. Results from three-point bending tests on specimens of different sizes and relative notch lengths are taken into account in this study. The proposed model has only two parameters whose values are constant for all specimen sizes and notch lengths.

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Fracture process zone in concrete tension specimen

Cited by 313 publications

References 1 publication

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

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

Non‐local damage model with evolving internal length

Modelling of size and shape of damage zone in quasi-brittle notched specimens – analytical approach based on fracture-mechanical evaluation of loading curves

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