Advances in pull-out testing and data analysis

“…It can be noted that all the curves exhibit the non-linear behavior characteristic of a ductile matrix [41]. However, once the load reaches its maximum value there are clearly significant differences in the way these curves drop.…”

Section: Interfacial Shear Strength Test (Pull Out Test) Resultsmentioning

confidence: 96%

Improving the bonding between henequen fibers and high density polyethylene using atmospheric pressure ethylene-plasma treatments

Aguilar-Rios¹,

Herrera‐Franco²,

De³

et al. 2014

Express Polym. Lett.

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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%

“…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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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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Advances in pull-out testing and data analysis

Cited by 142 publications

References 38 publications

“Fundamental” and “practical” adhesion in polymer-fiber systems

“Fundamental” and “practical” adhesion in polymer-fiber systems

Improving the bonding between henequen fibers and high density polyethylene using atmospheric pressure ethylene-plasma treatments

Investigation of the micromechanics of the microbond test

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