Influence of the fiber length on the stress transfer from glass and carbon fibers into a thermoplastic matrix in the pull-out test

Marotzke, Christian

doi:10.1163/156855493x00040

Cited by 56 publications

(12 citation statements)

References 6 publications

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“…The larger strength values for modified glass fibres calculated from the data of the pull-out experiment (compared with those from the pushout test) can be explained by different loading patterns in these two techniques. While during the pull-out test, the fibre cross-section contracts and the interface is loaded predominantly in tension [17], in the push-out test we have a combination of compression, shear, and friction. It is possible that the interphase in the former case is effectively involved in load transfer, and the specimen fails through cohesive matrix failure at some distance from the fibre surface rather than by a brittle interfacial crack.…”

Section: Resultsmentioning

confidence: 99%

Characterisation of the Interfacial bond Strength between Glass Fibre and Epoxy Resin using the Pull-Out and Push-Out Techniques

Mδder

Zhou

Pisanova

et al. 2000

Advanced Composites Letters

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Interfacial bond strength between epoxy resin and glass fibre was studied using the pull-out and push-out techniques. For untreated fibres, these micromechanical tests gave similar values of the local interfacial shear strength and critical energy release rate. In the case of fibres treated by gAPS , both tests showed considerable increase in the bond strength. However, for the modified fibres, the pull-out test gave greater values of both interfacial parameters than the push-out test, a result attributed to the different modes of interfacial loading. The different loading patterns also cause different failure mechanisms in these two tests.

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Section: Resultsmentioning

confidence: 99%

Characterisation of the Interfacial bond Strength between Glass Fibre and Epoxy Resin using the Pull-Out and Push-Out Techniques

Mδder

Zhou

Pisanova

et al. 2000

Advanced Composites Letters

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“…Crack initiation takes place at the interface position x = 0, see Figure 2. At this point, Mode I prevails, caused by the radial stress component [14]. Please note that the deformation in this figure is highly scaled so that separation between fiber and matrix appears larger.…”

Section: Crackingmentioning

confidence: 93%

“…The FE model depicts the geometry of the reference experiment with the embedded fiber length of l e = 129 µm and the fiber radius of r f = 6.67 µm. The modeling approach is based on Marotzke [14]. As the pull-out test sample can be regarded as symmetric and the loading is symmetric, too, axisymmetric modeling is used.…”

Section: Model Geometry and Boundary Conditionsmentioning

confidence: 99%

“…Due to the smaller dimensions of the cutout compared to the real dimensions of the matrix droplet, the geometry of the matrix drop is assumed to be simplified as a cylinder. According to Marotzke [14], a radial l y and longitudinal distance l x of the outer cylinder surface from the embedded fiber of half of the embedded fiber length is sufficient to prevent boundary effects from affecting the interface stress state. This results in the matrix droplet dimensions of l x = 64.5 µm and l y = 64.5 µm, see Figure 2.…”

Section: Model Geometry and Boundary Conditionsmentioning

confidence: 99%

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Numerical simulation of fiber-matrix debonding in single fiber pull-out tests

Hoppe

2020

GAMMAS

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The present work deals with the numerical crack simulation of fiber-matrix debonding in single fiber pull-out tests. For this purpose, two models are used: a finite element model (FE model) with the cohesive zone approach and a peridynamic model. For calibration a reference experiment is applied. In addition analytical equations are used for reference values. The influence of the model parameters and the material parameters of the cohesive zone model on the force-displacement curve is investigated. Besides the free fiber length, the critical interface strength, the critical energy release rate as well as the initial interface stiffness have a great influence on the force-displacement curve of the pull-out test. From the crack simulation it can be seen that Mode I has an influence on the crack initiation, but further crack growth after initiation is dominated by Mode II. The FE model can be calibrated in a way that the crack initiation point and the maximum force correspond to the reference experiment. The peridynamic model depicts a comparable crack formation process.

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“…In the example of Broutman test, fiber parallel loads are introduced in order to provoke radial interfacial failure [19]. Also single fiber pull out tests can generate a tensile failure in the relevant region and can hence be used to determine tensile interfacial properties [1,20]. A major drawback of the indirect methods is the lacking comparability of matrix stress state in comparison to the real composite material.…”

Section: Setups For the Characterization Of The Fiber Matrix Interfacementioning

confidence: 99%

Experimental and numerical investigation of the properties of the fiber/matrix-interface of CFRP using model composites

Hopmann¹

2019

Zeitschrift Kunststofftechnik

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Experimental and numerical investigation of the properties of the fiber/matrix-interface of CFRP using model composites In this study, a novel approach to characterize the fiber/matrix-interface properties under transverse tensile loading of carbon fiber reinforced epoxy is presented. A single-fiber specimen concept for tensile testing perpendicular to the fiber is developed. Using the novel specimen concept, the interfacial failure is observed and the relevant variables describing the problem are extracted from the results. Under transversal tension, matrix has undergone significant plastic deformation prior to the interface failure. It is also found, that interfacial failure can be prematurely induced by plastic shear bands which initiated at flaws and other irregularities. Experimentelle und numerische Untersuchung der Faser/Matrix-Grenzflächeneigenschaften von CFK mit Modellverbunden In dieser Studie wird ein neuartiger Ansatz zur Charakterisierung der Faser/Matrix-Grenzflächeneigenschaften von kohlefaserverstärkten Epoxidharzen unter Querzugbelastung vorgestellt. Es wird ein Einzelfaser-Probenkonzept für die Zugprüfung senkrecht zur Faser entwickelt. Mit dem neuartigen Probenkonzept wird das Grenzflächenversagen beobachtet und die relevanten Kennwerte extrahiert. Unter Querspannung hat sich die Matrix vor dem Versagen der Grenzfläche stark plastisch verformt. Es wird auch festgestellt, dass Grenzflächenversagen vorzeitig durch plastische Scherbänder hervorgerufen werden kann, die bei Fehlstellen und anderen Unregelmäßigkeiten ausgelöst werden.

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Influence of the fiber length on the stress transfer from glass and carbon fibers into a thermoplastic matrix in the pull-out test

Cited by 56 publications

References 6 publications

Characterisation of the Interfacial bond Strength between Glass Fibre and Epoxy Resin using the Pull-Out and Push-Out Techniques

Characterisation of the Interfacial bond Strength between Glass Fibre and Epoxy Resin using the Pull-Out and Push-Out Techniques

Numerical simulation of fiber-matrix debonding in single fiber pull-out tests

Experimental and numerical investigation of the properties of the fiber/matrix-interface of CFRP using model composites

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