The effect of interfacial radial and shear stress on fibre pull-out in composite materials

Takaku, Akira; Arridge, R. G. C.

doi:10.1088/0022-3727/6/17/310

Cited by 260 publications

(70 citation statements)

References 5 publications

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“…There is some scatter in the data, but it can be seen that the strain in the fibre is a maximum close to the point where the loaded fibre enters the droplet and the strain rapidly decreases along the length of the droplet. This is as might be expected from shear lag theory [39,40], but is contrary to the assumption made in the simple analysis of the microbond test [12,13], that the shear stress is constant. In order for the shear stress to be constant the decrease of strain with distance through the droplet should be linear, which is not the case as shown by figure 7.…”

Section: Raman Investigations Of Microbond Samples At Low Strain Levelscontrasting

confidence: 71%

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: Raman Investigations Of Microbond Samples At Low Strain Levelscontrasting

confidence: 71%

Investigation of the micromechanics of the microbond test

Day¹,

Rodrigez²

1998

Composites Science and Technology

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“…Due to one-sided bonding and the resulting eccentric load transmission, shear stress is superimposed by a bending moment. Tension-induced contraction will lead to additional lateral strain at the interface (Banholzer et al 2005), and Poisson contraction will reduce the frictional stress during pull-out (Takaku and Arridge 1973). An implication out of these results is that a rough surface can partially transform tangential acting shear forces into normal forces due to increased elevations and valleys in the strand.…”

Section: Discussionmentioning

confidence: 99%

Investigation of the Mechanical Interactions at the Interface of Wood-Cement Composites by Means of Electronic Speckle Pattern Interferometry

Frybort¹,

Mauritz²,

Teischinger³

et al. 2012

BioResources

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This study investigates the bonding behaviour of Norway spruce wood strands to a surrounding cement matrix. Effects of wood swelling and shrinking during cement curing were studied by using strands of various thicknesses. The deformation of the spruce wood strands and the surrounding cement matrix, as well as the interface between the wood and the cement were examined using Electronic Laser Speckle Interferometry (ESPI) while applying a pull-out load. Sample deformation was transformed to shear strain maps, showing which side of the strand was tightly bonded to the cement matrix. The analysis of the strain maps proved that all strands were tightly bonded to the cement matrix on only one side. No shear deformation was observed on the loosely bonded side, meaning that there was no adhesion on that side between the wood strand and the cement matrix. Manufacturing of strands results in different surface characteristics and surface roughness. Bringing together the ESPI results with the roughness measurements, it was shown that only the comparably rougher surface adheres to the cement matrix. In a cement bonded composite (CBC) made of lignocellulosics to a greater or lesser extent, only half of the contact area is therefore able to transfer load.

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“…Many researchers studied some related subjects such as creep, relaxation and plastic deformation [1][2][3][4][5][6][7][8][9][10]. For example, pulling out and extraction of a stainless steel wire inserted into an epoxy resin have been analyzed as a function of the embedded length using shear lag model [1].…”

Section: Introductionmentioning

confidence: 99%

“…For example, pulling out and extraction of a stainless steel wire inserted into an epoxy resin have been analyzed as a function of the embedded length using shear lag model [1]. In addition, creep exponential Dorn law was used for predicting creep behavior of the composites [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of atomic number and atomic weight on time-dependent inelastic deformation in metals

MONFARED¹,

Daneshmand²,

MONFARED³

2016

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Principal purpose of this research is to study the effect of atomic number and atomic weight on behavior of time-dependent inelastic deformation in metals. For achieving this purpose, analytical and semi-analytical methods are used for analyzing the behavior of the deformations. The elements such as silver, aluminum and nickel are selected for validation of the presented method and obtained results. The effect of other important parameters is investigated for predicting time-dependent behavior of creeping metals. As a result, we can control creep behavior in metals in order to prevent creep rupture. Finally, good agreement is found between presented method and available experimental results.

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The effect of interfacial radial and shear stress on fibre pull-out in composite materials

Cited by 260 publications

References 5 publications

Investigation of the micromechanics of the microbond test

Investigation of the micromechanics of the microbond test

Investigation of the Mechanical Interactions at the Interface of Wood-Cement Composites by Means of Electronic Speckle Pattern Interferometry

Effect of atomic number and atomic weight on time-dependent inelastic deformation in metals

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