A review of analytical models to describe pull-out behavior – Fiber/matrix adhesion

Teklal, Fatiha; Djebbar, Arezki; Allaoui, Samir; Hivet, Gilles; Joliff, Y.; Kacimi, Bachir

doi:10.1016/j.compstruct.2018.06.091

Cited by 73 publications

(32 citation statements)

References 163 publications

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“…It is also worth emphasising the dense transverse multi‐cracking that occurs in the matrix that penetrated into the yarn, illustrated by the zoom made in the transversal slice on Figure 13b. This damage pattern is also similar to those observed in other brittle matrix composite 4, 40 and is the sign of a great interfacial bond and a good penetration of the matrix inside the yarn. The spacing is here smaller than the one observed in BF + NAG3 sample and equals to about 50 μm.…”

Section: Interfacial Damage Of Various Single Yarns Embedded In Mortasupporting

confidence: 85%

“…This methodology allows for the determination of respective interfacial parameters, usually fitting maximal pull-out force and residual frictional force, whenever non null. A recent review of pull-out tests is provided by Teklal et al [18] . With multi-fibre yarns, impregnation by the cementitious matrix has been evidenced, from scanning electron microscopy (SEM) observations and mechanical tests, to constitute a key parameter [19] [20] influencing pull-out properties.…”

Section: Introductionmentioning

confidence: 99%

“…This methodology allows for the determination of respective interfacial parameters, usually fitting maximal pull‐out force and residual frictional force, whenever non null. A recent review of pull‐out tests is provided by Teklal et al 18 With multi‐fibre yarns, impregnation by the cementitious matrix has been evidenced, from scanning electron microscopy (SEM) observations and mechanical tests, to constitute a key parameter 19,20 influencing pull‐out properties. Nevertheless, concerning direct observations, apart from specific considerations based on SEM analyses on the deterioration due to cement alkalinity of multi‐fibre yarns, 21 , 22 no direct observation has been made on progressive damage that develops at the interface between yarn and cementitious matrix, up to the authors' knowledge.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

X‐ray tomographic observations of microcracking patterns in fibre‐reinforced mortar during tension stiffening tests

Ducoulombier

Chateau

Bornert

et al. 2020

Strain

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For the last decades, new reparation or fabrication processes have been studied to replace traditional rebar by roving of different mineral or organic fibres to avoid corrosion issues. Such materials refer to the family of cementitious composite. Their tensile strength would directly depend on the proportion of reinforcement but also strongly on the interfacial mechanical properties between fibres and cementitious matrix. From now, evaluation of interfacial properties was mostly limited to the use of force-displacement curves obtained from mechanical experiments. This work presents a new methodology using micromechanical tension stiffening tests combined with X-ray computed tomography (XRCT) observations, performed at the Anatomix beamline at Synchrotron Soleil, and specific image processing procedures. Multi XRCT acquisitions with suitable scanning strategy are used to image the whole fibre-matrix interface along centimetric samples at four to five different levels of loading magnitude. Intensive image processing is then performed on tomographic images including digital volume correlation (DVC), image subtraction and Hessian-based filtering. This experiment allows to study damage mechanisms at small scale. The proposed methodology shows great potential to provide both qualitative and quantitative elements on interfacial mechanical behaviour such as crack growth and crack orientation. The interface between mortar and sufficiently small multi-fibre yarn used in this paper is shown to behave in certain condition as traditional rebar interface producing conical cracks in the surrounding matrix rather than debonding in mode 2, permitting a much higher energy dissipation during debonding. According to this study, conical cracks repartition and geometry are mostly influenced by the cementitious matrix. The spacing between cracks goes from 50 to 100 μm and the angle between crack normal vector and yarn orientation goes from 35 to 50 degrees.

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Section: Interfacial Damage Of Various Single Yarns Embedded In Mortasupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

X‐ray tomographic observations of microcracking patterns in fibre‐reinforced mortar during tension stiffening tests

Ducoulombier

Chateau

Bornert

et al. 2020

Strain

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“…Numerous experimental tests have been proposed in literature to quantify strength and mechanical behavior depending on the material used and fiber geometry at different scale. Reviews of these investigations can be found in [6,7].…”

Section: Determination Of Interfacial Mechanical Properties Using Mesmentioning

confidence: 99%

Characterisation and modelling of interfacial damage in fibre-reinforced concrete for 3D printing in construction

Ducoulombier

Chateau

Bornert

et al. 2019

Proceedings of the 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Extrusion-based additive manufacturing of cementitious material is a promising technology for the future of construction. Nevertheless, new solutions need to be proposed to provide either ductility or even reinforcement in areas in tension. Using fibres to reinforce the structure made by extrusion seems to be promising and needs to be fully understood at different scales. Moreover, the efficiency of reinforcement depends mainly on the interfacial properties between matrix and fibres. Decohesion between matrix and fibre is studied at two different scales. A mesoscopic analytical mechanical model of a so-called tension stiffening test has been proposed to quantify resistance and friction along the interface from the force-elongation curve. Secondly, the same experimental test is performed inside the microtomography setup of the Anatomix beamline of Synchrotron Soleil permitting to identify the microscopic nature, shape and the evolution of decohesion between matrix and fibres for different loading. Different types of fibres are compared and different damaging mechanisms are observed.

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“…Teklal et al. 26 presented an overview of the analytical models reported in the literature to measure the shear strength and critical fracture energy at the interface, the parameters influencing these properties, the geometry of the model, embedded length of the fiber, fiber diameter and loading conditions, including, manufacturing route and the resulting defects.…”

Section: Introductionmentioning

confidence: 99%

Static and fatigue behaviors of short glass fiber–reinforced polypropylene composites aged in a wet environment

Mansouri

Djebbar

Khatir

et al. 2019

Journal of Composite Materials

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In this paper, a new experimental study of the bending static and fatigue behaviors of a composite material reinforced with 40% by mass of short glass fibers (type E) and polypropylene matrix is presented. The composite material is obtained in the form of plates by an injection process, which inevitably affects the distribution of the fibers and therefore the behavior of the material studied. To do this, several techniques are implemented on specimens by cutting them in transverse and longitudinal directions. The effect of aging in distilled water at 40℃ on the mechanical characteristics is studied under static and fatigue loading conditions. The static tests, three-point flexure up to failure, allow us to choose the levels of stress for the fatigue tests. The endurance curves as a function of the number of cycles are plotted by adapting the end-of-test criteria N5, N10, and N20, which represent a rigidity drop of 5%, 10%, and 20%, respectively. An interpretation of the Wöhler curve equations defined for the end-of-test criteria allows defining the kinetics of material damage. The results highlighted the influence of distilled water on the mechanical behavior and the lifetime of the material. We also perform macroscopic observations of fracture and microscopic facies in order to identify the damage mechanisms of the composite material.

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A review of analytical models to describe pull-out behavior – Fiber/matrix adhesion

Cited by 73 publications

References 163 publications

X‐ray tomographic observations of microcracking patterns in fibre‐reinforced mortar during tension stiffening tests

X‐ray tomographic observations of microcracking patterns in fibre‐reinforced mortar during tension stiffening tests

Characterisation and modelling of interfacial damage in fibre-reinforced concrete for 3D printing in construction

Static and fatigue behaviors of short glass fiber–reinforced polypropylene composites aged in a wet environment

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