Stick-slip during fibre pull-out

Cook, Robert F.; Thouless, M.D.; Clarke, David R.; Kroll, Markus

doi:10.1016/0036-9748(89)90350-5

Cited by 25 publications

(7 citation statements)

References 7 publications

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“…Marshall and Price have designed a “micro‐composite” single fiber pull‐out test to permit the visual observation of events at the fiber/matrix interface and the collection of detailed mechanical data as interface debonding and fiber pull‐out occur. Several characteristics displayed by the load/displacement measurements have been directly correlated with observed events such as fiber Stick–slip and interfacial frictional effects. The linear relationship between debonding force and embedded length (Fig.…”

Section: Fiber/matrix Interface Behaviormentioning

confidence: 78%

“…The technique involves application of micro‐droplets of resin (30–200 µm long) onto a single fiber, followed by measurement of the force required to pull out or debond the fiber from each droplet. This technique has been applied successfully to various fiber/resin systems and to study the consequences of fiber surface treatments . Later, Gaur and Miller have used the micro‐bond technique to investigate the effect of environmental exposure on the interfacial shear strength of E‐glass/epoxy and Kevlar/epoxy systems.…”

Section: Fiber/matrix Interface Behaviormentioning

confidence: 99%

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Environmental damage and degradation of FRP composites: A review report

Ray

Rathore

2014

Polymer Composites

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Fiber‐reinforced plastics (FRP) composites are prime choice materials in various civil engineering structures and high performance aerospace components. They exhibit superior mechanical properties than their metallic counterparts. However, they are susceptible to environmental damages and degradations. To utilize the full potential of FRP composite materials their physical, chemical, and mechanical behavior in different environmental conditions should be well established. Present review is an attempt at highlighting different damage/degradations that may be caused to the FRP composite on its exposure to various environmental conditions. POLYM. COMPOS. 36:410–423, 2015. © 2014 Society of Plastics Engineers

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Section: Fiber/matrix Interface Behaviormentioning

confidence: 78%

Section: Fiber/matrix Interface Behaviormentioning

confidence: 99%

Environmental damage and degradation of FRP composites: A review report

Ray

Rathore

2014

Polymer Composites

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“…Figure 12 is a pullout curve for one of the straight bers that pulled out of the polyurethane. The ber exhibits stick-slip during pullout; this is a common phenomenon seen during single ber pullout tests [20,21].…”

Section: Acetone Washed Bersmentioning

confidence: 99%

Debond behavior of copper fibers in thermoset matrices and their effect on fracture toughening

Bagwell¹,

Wetherhold²

2003

Journal of Adhesion Science and Technology

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Single ber pullout experiments were conducted to determine the adhesion quality, debond behavior and subsequent matrix fracture behavior for a variety of end-modi ed copper bers. The matrices were: two different epoxy resins, polyester and polyurethane; the end-modi ed copper bers were: straight, at end-impacted, at end-impacted with release agent applied and straight end-oxidized. The goal was to determine how the bonding and debonding behavior as well as the pullout behavior of the various ber-matrix combinations affected the composite fracture toughness increment (1G). Results indicate that the greatest improvement in the calculated 1G occurred with a ber-matrix combination that had a moderate interface bond strength with an interfacial bond failure, minor matrix damage during ber pullout and moderate post-debond interface friction. Selective oxidation of the ber end was performed to determine if chemical anchoring of the ber end could be as effective as mechanical (end-shaping) anchoring of the ber into the matrix. Improvement in the adhesion bond strength as a result of the chemical anchoring resulted in a signi cantly lower 1G compared to the end-impacted bers because interfacial failure was not possible. This indicates that for the materials tested, mechanical anchoring of the ber was better than chemical anchoring in improving 1G. To decrease the adhesion bond strength and allow the bers to debond, a release agent was applied to the at end-impacted ber prior to embedment into the matrix. This resulted in a signi cantly lower 1G compared to straight and at end-impacted bers for all matrices tested, because the resulting debonding force and friction were signi cantly reduced. Pullout curves showed that with release agent applied, the end-shape did not effectively anchor the ber into the matrix. The reduction in the pullout work indicates that the friction at the ber-matrix interface plays a crucial role in actively anchoring the end-shaped ber into the matrix after debonding.

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“…1016/j.ijsolstr.2006.11.034 a rod to a surrounding elastic material was originally reported in Sternberg, 1969, 1970;Luk and Keer, 1979). Experiment on fiber debonding and pullout was studied in detail, for example, in Cook et al (1989). Fiber pullout was simulated in terms of a boundary value problem with a finite element method for a circular cylinder with a rigid fiber embedded in its center (Atkinson et al, 1982;Freund, 1992;Povirk and Needleman, 1993).…”

Section: Introductionmentioning

confidence: 98%

Intensity of singular stress fields causing interfacial debonding at the end of a fiber under pullout force and transverse tension

Noda

Shirao

et al. 2007

International Journal of Solids and Structures

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In this study, singular stress fields at the ends of fibers are discussed by the use of models of rectangular and cylindrical inclusions in a semi-infinite body under pullout force. Those singular stresses have not been discussed yet in the previous studies for pullout problems although they are important for causing interfacial initial debonding. The body force method is used to formulate those problems as a system of singular integral equations where unknowns are densities of the body forces distributed in a semi-infinite body having the same elastic constants as those of the matrix and inclusions. In order to compare the results with the previous solutions, tension problems of a fiber in a semi-infinite body are also considered. Then, generalized stress intensity factors at the corner of rectangular and cylindrical inclusions are systematically calculated for various geometrical conditions with varying the elastic ratio, length, and spacing of the location from edge to inner of the body. The effects of elastic modulus ratio and aspect ratio of inclusion upon the stress intensity factors are discussed for pullout problems.

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Stick-slip during fibre pull-out

Cited by 25 publications

References 7 publications

Environmental damage and degradation of FRP composites: A review report

Environmental damage and degradation of FRP composites: A review report

Debond behavior of copper fibers in thermoset matrices and their effect on fracture toughening

Intensity of singular stress fields causing interfacial debonding at the end of a fiber under pullout force and transverse tension

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