Modelling of critical fibre length and interfacial debonding in the fragmentation testing of polymer composites

Lacroix, T.; Tilmans, B.; Keunings, Roland; Desaeger, M; Verpoest, Ignace

doi:10.1016/0266-3538(92)90061-7

Cited by 102 publications

(21 citation statements)

References 7 publications

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“…Equation (4) is the simplest version of shear lag model, which has been extended by several authors, see e.g. [31][32][33]. In the present case, the analytical limit achieved by eq.…”

Section: Comparison With Analytical Methodsmentioning

confidence: 78%

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On the interaction between different size effects in fibre reinforced PMMA: Towards composites with optimised fracture behaviour

Scheider

Xiao

Huber

et al. 2013

Computational Materials Science

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This paper is concerned with a numerical investigation of different size effects and their interactions in fibre reinforced PMMA. Focus is on the mechanical responseparticularly on the damage and the fracture behaviour. The performed numerical studies are based on finite element simulations in which representative volume elements with different microstructures have been virtually mechanically tested and compared to each other. The underlying numerical model captures the most relevant mechanical mechanisms such as damage evolution, crack propagation and failure by a cohesive zone model. Previous studies have shown that the effective macroscopic fracture properties can be changed by varying the thickness of the fibres. In this paper, an additional size effect resulting from a variation of the fibres' lengths and the interaction between both size effects is carefully analysed. By understanding such size effects, the observed failure mechanisms can be changed effectively and the properties of the considered composite can be improved significantly. For instance, it will be shown that a composite can be designed which shows a high strength as well as a high fracture energy.

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“…Equation (4) is the simplest version of shear lag model, which has been extended by several authors, see e.g. [31][32][33]. In the present case, the analytical limit achieved by eq.…”

Section: Comparison With Analytical Methodsmentioning

confidence: 78%

“…Before cracking, a standard isotropic hyperelastic constitutive model is employed. In line with the range of the Young's modulus E documented in the literature (230 GPa in [33] up to 330 GPa in [34]) and the Poisson's ratio ν, the elasticity constants are set to E=270 GPa and ν = 0.27.…”

Section: Bulk Materialsmentioning

confidence: 99%

On the interaction between different size effects in fibre reinforced PMMA: Towards composites with optimised fracture behaviour

Scheider

Xiao

Huber

et al. 2013

Computational Materials Science

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“…Proper analysis of the mechanics of such fractures will yield fracture energies of the interface, but the standard test methods do not provide the magnitude of the intrinsic adhesion strength of the interface. Other tests for composites, such as single-fiber fragmentation and fiber pullout tests, yield a combination of both interfacial strength and frictional resistance between the fiber and matrix [2,[8][9][10][11][12][13]. Some of these problems are avoided in the SPC mechanical test developed by Harding and Berg [2].…”

Section: Apparent Work Of Adhesion and Comparison Between Optical Spcmentioning

confidence: 99%

The effect of vinyl alcohol content on adhesion performance in poly(vinyl butyral)/glass systems

Nguyen¹,

Berg²

2004

Journal of Adhesion Science and Technology

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The effect of the concentration of vinyl alcohol (VOH) groups in commercial poly(vinyl butyral) (PVB) on the adhesion of the polymer to glass beads in particle-filled composites is investigated. Both the optical single particle composite (SPC) and acoustic emission (AE) techniques were used to determine the applied uniaxial tensile stress at which a single imbedded particle was detached from the matrix. The results for the failure stress from the two techniques are consistent with one another and show that the adhesion strength is improved substantially as the vinyl alcohol content increases. The improved adhesion performance is attributed to an increase in condensation of hydroxyls within the polymer matrix and acid-base interactions between the hydroxyl groups on the bead's surface and those in the polymer. The AE results also provide details of the mechanism of the debonding event in cases of both weak and strong adhesion.

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“…8 are similar to those predicted by the shear‐lag model ( Cox, 1952) which assumes good bonding across the fibre/matrix interface. The variation in tensile fibre strain, e f , with distance, x , along a fibre of length, l , is given by ( Lacroix et al ., 1992 )…”

Section: Composite Micromechanicsmentioning

confidence: 99%

Analysis of SiC fibres and composites using Raman microscopy

Young

Broadbridge

1999

Journal of Microscopy

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SummaryThe application of Raman spectroscopy in the analysis of the microstructure of SCS-6 silicon carbide fibres using a Renishaw Raman microscope is described. It is demonstrated that the technique allows a detailed study to be made of the point-to-point variation in microstructure across a fibre section. It has been possible to monitor the variation of the concentration of SiC and carbon in the fibre microstructure and to detect differences in the forms of carbon present. It is also shown that Raman spectroscopy can be used to follow the micromechanics of both the deformation of silicon carbide fibres and of the fibres within a model composite. Well-defined Raman spectra have been obtained from a variety of Nicalon and Tyranno fibres and the positions of the Raman bands shown to shift on the application of stress or strain. From such stress-induced Raman band shifts, the point-to-point variation of axial fibre stress or strain along an individual fibre in an epoxy matrix can be determined. An example is given of the use of the technique to map the distributions of axial fibre strain in a Nicalon/epoxy fragmentation test specimen and to model the failure processes at the fibre/matrix interface.

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Modelling of critical fibre length and interfacial debonding in the fragmentation testing of polymer composites

Cited by 102 publications

References 7 publications

On the interaction between different size effects in fibre reinforced PMMA: Towards composites with optimised fracture behaviour

On the interaction between different size effects in fibre reinforced PMMA: Towards composites with optimised fracture behaviour

The effect of vinyl alcohol content on adhesion performance in poly(vinyl butyral)/glass systems

Analysis of SiC fibres and composites using Raman microscopy

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