Continuous Modeling Technique of Fiber Pullout from a Cement Matrix with Different Interface Mechanical Properties Using Finite Element Program

Friedrich, Leandro Ferreira; Chong, Wang

doi:10.1590/1679-78252575

Cited by 15 publications

(10 citation statements)

References 24 publications

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“…The fiber–matrix interactions are comparable to those for a steel bar embedded in concrete [ 1 ]. Several systems for simulating the bond-slip of steel rebar in concrete have been suggested in the literature [ 30 , 31 , 33 ]. Here, the surface-to-surface contact model [ 34 ] was used to simulate the fiber–matrix bond-slip response, which requires selecting the master and slave surfaces.…”

Section: Finite Element Modelingmentioning

confidence: 99%

“…Even though many simulation schemes have been established, the existing research has many expediencies, reliabilities, and uninterrupted simulation issues for the microstructural fracture mechanics of SFRC (i.e., single fiber pullout). Simulation disturbance is commonly caused by numerical discrepancies and is associated with the nonlinearity of the fiber–matrix bond [ 30 ]. Therefore, stable simulation of the single hooked-end fiber pullout model is scarce.…”

Section: Introductionmentioning

confidence: 99%

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Microscale Cohesive-Friction-Based Finite Element Model for the Crack Opening Mechanism of Hooked-End Steel Fiber-Reinforced Concrete

Abbas

2021

Materials

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The entire mechanical properties of steel fiber-reinforced concrete (SFRC) are significantly dependent on the fiber–matrix interactions. In the current study, a finite element (FE) model was developed to simulate the pullout response of hooked-end SFRC employing cohesive–frictional interactions. Plain stress elements were adapted in the model to exemplify the fiber process constituents, taking into consideration the material nonlinearity of the hooked-end fiber. Additionally, a surface-to-surface contact model was used to simulate the fiber’s behavior in the pullout mechanism. The model was calibrated against experimental observations, and a modification factor model was proposed to account for the 3D phenomenalistic behavior of the pullout behavior. Realistic predictions were obtained by using this factor to predict the entire pullout-slip curves and independent results for the peak pullout load. The numerical results indicated that the increased fiber diameter would alter the mode of crack opening from fiber–matrix damage to that combined with matrix spalling, which can neutralize the sensitivity of the entire pullout response of hooked-end steel fiber to embedment depth. Additionally, the fiber–matrix bond was enhanced by increasing the fiber’s surface area, sensibly leading to a higher pullout peak load and toughness. The developed FE model was also proficient in predicting microstructural stress distribution and deformations during the crack opening of SFRC. This model could be extended to fully model a loaded SFRC composite material by the inclusion of various randomly oriented dosages of fibers in the concrete block.

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Section: Finite Element Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microscale Cohesive-Friction-Based Finite Element Model for the Crack Opening Mechanism of Hooked-End Steel Fiber-Reinforced Concrete

Abbas

2021

Materials

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“…For instance, Ferreira and Wang proposed a continuous modeling technique to simulate the fiber debonding and pullout processes from a cement matrix using different interface mechanical properties. Interface elements with cohesive surface tractions were used in the fiber-matrix interface to simulate debonding process, whereas spring elements with a variable stiffness related to the shear stress were employed for the pull-out process (Friedrich and Wang 2016). According to the numerical results, a change from τ=1.5 MPa to τ=2.5 MPa, which is a possible deviation between experimental tests, considerably influences the behavior of the pull-out force with the slip displacement, leading, for example, to an increase of the maximum pull out force from 9.5 N to 15 N, approximately.…”

Section: Fiber-matrix Interfacial Strength : Measurement Uncertaintymentioning

confidence: 99%

Fragmentation model for the tensile response of unidirectional composites based on the critical number of fiber breaks and the correction of the fiber-matrix interfacial strength.

Vanegas-Jaramillo

Patiño-Arcila

2019

Lat. Am. j. solids struct.

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A fragmentation model based on global load sharing (GLS) theory is developed to obtain stress-strain curves that describe the mechanical behavior of unidirectional composites. The model is named + * because it is based on the Critical Number of Breaks model (CNB) and on the correction of the fiber matrix interfacial strength, *. Model allows both obtaining the ultimate tensile strength of CFRP and GFRP composites, and correcting the vs curve to match its peak point with the predicted strength, which is more accurate than the one obtained by previous GLS-based models. Our model is used to classify the mechanical response of the material according to the energetic contributions of two phenomena up to the failure: intact fibers (IF) and fragmentation (FM). Additionally, the influence of fiber content, , on the tensile strength, , failure strain, , and total strain energy, , is analyzed by means of novel mechanical-performance maps obtained by the model. The maps show a dissimilar behavior of , and with between GFRP and CFRP composites. The low influence of on the percent energetic contributions of IF and FM zones, as well as the larger energetic contribution of the FM zone, are common conclusions that can be addressed for both kinds of composites.

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“…It is noted that in the simulation, the computed maximum shear stresses are overestimated when compared to those calculated in the experimental work [6], which could be explained by the perfectly bonded rigid interface. A simulation that takes into account a cohesive interface [43][44][45] could provide more accurate results; however, since we are interested in using the numerical simulations to better understand the 3D stress distribution and directions, the model here employed was deemed sufficient for our simulation results. Figure 9a shows the contour plot of the first (maximum) principal stress r 1 in the elements located at the symmetry Plane 1 (Fig.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Photoelastic and numerical analyses of the stress distribution around a fiber in a pull‐out test for a thermoplastic fiber/epoxy resin composite

et al. 2017

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The stress distribution in a polyester fiber/epoxy matrix model composite subjected to pull‐out test was investigated through photoelasticity and elastic‐plastic numerical analysis using finite element (FE) simulations. A photoelastic technique was used to obtain isoclinic fringe patterns, which were employed to construct a pair of orthogonal families of principal stress trajectories for a pull‐out specimen. It was found that the trajectories of the maximum principal stress tend to converge at points where either the maximum interfacial shear stress is located or there is stress concentration. The FE simulations proved to be a powerful tool that allowed understanding the 3D stress distributions, in areas located near the embedded fiber, where principal directions were influenced by radial stresses, effects of Poisson's ratio, reduction of fiber diameter and plasticity. The FE simulations could be extended to quantify stress fields in other single‐fiber test configurations. POLYM. COMPOS., 39:E2397–E2406, 2018. © 2017 Society of Plastics Engineers

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Continuous Modeling Technique of Fiber Pullout from a Cement Matrix with Different Interface Mechanical Properties Using Finite Element Program

Cited by 15 publications

References 24 publications

Microscale Cohesive-Friction-Based Finite Element Model for the Crack Opening Mechanism of Hooked-End Steel Fiber-Reinforced Concrete

Microscale Cohesive-Friction-Based Finite Element Model for the Crack Opening Mechanism of Hooked-End Steel Fiber-Reinforced Concrete

Fragmentation model for the tensile response of unidirectional composites based on the critical number of fiber breaks and the correction of the fiber-matrix interfacial strength.

Photoelastic and numerical analyses of the stress distribution around a fiber in a pull‐out test for a thermoplastic fiber/epoxy resin composite

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