The glass fibre—polymer interface: I—theoretical consideration for single fibre pull-out tests

Chua, P.S.; Piggott, M. R.

doi:10.1016/0266-3538(85)90089-2

Cited by 171 publications

(43 citation statements)

References 5 publications

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“…It is noticeable, however, that the various tests give different results even when used to characterise the same system [14][15]. Of the single fibre methods the most commonly used has been the pull-out technique [1][2][3][4][5][6][7][8]. A limitation to this approach is that if the fibre embedded length is longer than the critical length then failure of the fibre will occur before pull out.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the micromechanics of the microbond test

Day¹,

Rodrigez²

1998

Composites Science and Technology

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The microbond test is a method which is sometimes used for measuring interfacial shear strength. In the analysis of the data it is often assumed that the interfacial shear stress is constant and thus, by implication, that the strain in the fibre along the embedded fibre decreases linearly from the point of entry to the point of exit. In this paper the results of conventional microbond tests and simulated microbond tests performed under a Raman microscope on a Kevlar-49/epoxy system are reported. The conventionally performed tests show that the calculated interfacial shear strength for this system is approximately 16 MPa regardless of the position of the supporting knife edges. The strain distribution along the fibre during simulated microbond tests was studied as a function of knife edge position, interfacial area and level of load by means of Raman spectroscopy. It was found that the interfacial shear stress was not constant, as is frequently assumed, but was strongly dependent upon distance through the droplet, knife-edge position and applied load. At low loads the strain was a maximum at the point where the fibre entered the droplet and then dropped off sharply through the embedded length. This effect was enhanced when the knife-edge separation was reduced. The variation of the shape of the stress distribution was similar to that predicted by a linear finite element analysis. At higher load levels the onset of failure in the region closest to the point where the fibre entered the droplet could be observed. M1 7HS AbstractThe microbond test is a method which is sometimes used for measuring interfacial shear strength. In the analysis of the data it is often assumed that the interfacial shear stress is constant and thus, by implication, that the strain in the fibre along the embedded fibre decreases linearly from the point of entry to the point of exit. In this paper the results of conventional microbond tests and simulated microbond tests performed under a Raman microscope on a Kevlar 49/epoxy system are reported. The conventionally performed tests show that the calculated interfacial shear strength for this system is approximately 16 MPa regardless of the position of the supporting knife edges. The strain distribution along the fibre during simulated microbond tests was studied as a function of knife edge position, interfacial area and level of load using Raman spectroscopy. It was found that the interfacial shear stress was not constant, as is frequently assumed, but was strongly dependent upon distance through the droplet, knife edge position and applied load. At low loads the strain was a maximum at the point where the fibre entered the droplet and then dropped off sharply through the embedded length. This effect was enhanced when the knife edge separation was reduced. The variation of the shape of the stress distribution was similar to that predicted by a linear finite element analysis. At higher load levels the onset of failure in the region closest to the point where the fibre entered the drople...

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Section: Introductionmentioning

confidence: 99%

“…The interfacial shear strength of composites can be measured by tests on single fibre systems [1][2][3][4][5][6][7][8][9][10][11][12][13]. It is noticeable, however, that the various tests give different results even when used to characterise the same system [14][15].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the micromechanics of the microbond test

Day¹,

Rodrigez²

1998

Composites Science and Technology

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“…Although there are several methods to study the interfacial adhesion in composite materials, the pull-out and single-fiber fragmentation tests are the most commonly used [8,9]. The pull-out test has been used to study the performance of thermoplastic fiber/thermoset matrix systems: PBO/epoxy [10], PE/epoxy [2], polyester (PET)/epoxy [11].…”

Section: Introductionmentioning

confidence: 99%

Photoelastic evaluation of fiber surface-treatments on the interfacial performance of a polyester fiber/epoxy model composite

Flores‐Johnson¹,

Vázquez‐Rodríguez²,

Herrera‐Franco³

et al. 2011

Composites Part A: Applied Science and Manufacturing

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Abstract:The interfacial adhesion between a polyester fiber and an epoxy matrix was improved by chemical and topological modifications of the fiber surface. The maximum interfacial shear strength was measured using photoelasticity to assess the interfacial performance in pull-out single-fiber composite specimens. An increase of the interfacial shear strength was observed when plasma-treated or surface-modified fibers were used; also, as the applied load to the free fiber was increased, the fiber treatment caused a reduction of the debonded area at the fiber-matrix interface.

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“…More sophisticated treatment of single-fiber pull-out test requires calculating the debonding shear stress by using shear lag theory [30,31]. Figure 5 shows axial distributions of the normal stress in the fiber and shear stress at the interface [26].…”

Section: Single-fiber Pull-out Testmentioning

confidence: 99%

“…The debonding shear stress τ * can be determined using σ 0* with the following relation [31]: Figure 5. Schematic stress distributions and load-displacement plot during the single-fiber pull-out test [26].…”

Section: Single-fiber Pull-out Testmentioning

confidence: 99%

Interfacial Modification of Hemp Fiber–Reinforced Composites

Karaduman¹,

Özdemir²,

Karaduman³

et al. 2018

Natural and Artificial Fiber-Reinforced Composites as Renewable Sources

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Natural fiber-reinforced biocomposites are increasingly used in various industries such as automotive, construction, biomedical, and recreation, thanks to their distinctive advantages over traditional glass fiber-reinforced plastics. Natural fiber composites are sustainable, environmentally friendly, low cost, low density, and easy to proc es sasw ella sha v ehi ghmec ha n ic alproperties. The quality of fiber-matrix interface is of critical importance since it determines the load distribution capability of the material. The interface between natural fibers and polymer resins has always been problematic because of the low compatibility between cellulose-based hydrophilic natural fibers and hydrophobic polymer resins, which leads to poor fiber-matrix adhesion and therefore inefficient load distribution between fibers and matrix. To date, several interfacial modification methods have been implemented to address this issue and improve the properties of the resulting composites. This chapter focuses on the interfacial modification of hemp fiber-based composites. First, hemp fiber structure and the nature of fiber-matrix interface were explained. Mechanisms of fiber/matrix adhesion as well as qualitative and quantitative methods for the determination of interface strength were outlined. Finally, the interface modification methods for hemp fiber-reinforced biocomposites were presented in the light of scientific literature.

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The glass fibre—polymer interface: I—theoretical consideration for single fibre pull-out tests

Cited by 171 publications

References 5 publications

Investigation of the micromechanics of the microbond test

Investigation of the micromechanics of the microbond test

Photoelastic evaluation of fiber surface-treatments on the interfacial performance of a polyester fiber/epoxy model composite

Interfacial Modification of Hemp Fiber–Reinforced Composites

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