The effect of temperature on stress transfer between a broken fibre and the adjacent fibres in unidirectional fibre composites

Behzadi, Shabnam; Jones, Frank R.

doi:10.1016/j.compscitech.2008.04.046

Cited by 19 publications

(21 citation statements)

References 46 publications

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“…At least five specimens were tested for each system. The specimen dimension of 1:1 length to diameter (L/D) ratio (10 mm/10 mm), as recommended in [25], was selected. This helped to avoid buckling, reduce friction due to small cross-section area, avoid premature failure due to sharp corners and prevent self-reaction of the epoxy resin during curing.…”

Section: Compression Testmentioning

confidence: 99%

Effect of silica nanoparticles on compressive properties of an epoxy polymer

et al. 2010

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The effect of nanosilica on compressive properties of an Epikote 828 epoxy at room temperature was studied. A 40 wt% nanosilica/epoxy masterbatch (nanopox F400) was used to prepare a series of epoxy based nanocomposites with 5-25 wt% nanosilica content. Static uniaxial compression tests were conducted on cubic and cylindrical specimens to study the compressive stress-strain response, failure mechanisms and damage characteristics of the pure and nanomodified epoxy. It was found that the compressive stiffness and strength were improved with increasing nanosilica content without significant reduction in failure strain.The presence of nanosilica improved ductility and promoted higher plastic hardening behaviour after yielding in comparison with the unmodified resin system. This result suggested that nanoparticles introduced additional mechanisms of energy absorption to enhance the compressive properties without reducing the deformation to failure.

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Section: Compression Testmentioning

confidence: 99%

Effect of silica nanoparticles on compressive properties of an epoxy polymer

et al. 2010

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“…The specimen dimension of 1 : 1 length to diameter L/D ratio (10 : 10 mm), as recommended in Ref. 15, was selected. Compression tests were also conducted on 12?5612?56 25?4 mm prismatic specimens (according to ASTM Standard D695).…”

Section: Compression Testsmentioning

confidence: 99%

Compressive behaviour of nanoclay modified aerospace grade epoxy polymer

Jumahat

Soutis

Jones

et al. 2012

Plastics, Rubber and Composites

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The effect of nanoclay on the compressive response of an aerospace grade epoxy polymer was studied. The resin was modified with montmorillonite clay type nanomer I.30, and compressive tests were performed on the optimised specimen geometry. A series of nanocomposite with 1-5 wt-% nanoclay content was fabricated using mechanical stirring and three-roll mill methods. The degree of dispersion of the clay nanoplatelets was examined using TEM. Static uniaxial compression tests were conducted. The compressive stress-strain curves showed that the presence of nanoclay improved the compressive strength and stiffness, promoted higher plastic hardening behaviour after yielding and enhanced the fracture toughness (area under s-e curve) of the epoxy polymer. The fracture surfaces of the broken specimens were observed using SEM with the aim to identify critical failure mechanisms that contributed to the polymer toughening. Rule of mixtures, Halpin-Tsai and modified Halpin-Tsai models were employed to estimate the compressive modulus of the clay-epoxy nanocomposite system.

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“…This is equivalent to the effect of higher temperatures on the ineffective length of the fibre. 20 The matrix becomes less efficient in transferring the overload to the vicinity of the broken fibre and this in turn reduces the stress concentration on the intact adjacent fibres. 21 …”

Section: Finite Element Analysismentioning

confidence: 99%

Rate dependent multiscale modelling of fibre reinforced composites

Foreman¹,

Behzadi²,

Tsampas³

et al. 2009

Plastics, Rubber and Composites

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A multiscale modelling technique has been developed to predict the strain rate dependent properties of a fibre reinforced composite system. The full stress-strain behaviour through yield of an amine cured epoxy resin matrix (tetraglycidyl 4,49-diaminodiphenylmethane) has been predicted using group interaction modelling. These data are used in a three-dimensional finite element model to obtain strain concentration factors of fibres adjacent to a fibre break in a unidirectional composite. A Monte Carlo simulation is performed to predict the tensile failure strain of a single composite layer and by assembling these layers the ultimate failure strain of the composite system is predicted. The technique is repeated over three different strain rates and consistency with experiment is observed.

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The effect of temperature on stress transfer between a broken fibre and the adjacent fibres in unidirectional fibre composites

Cited by 19 publications

References 46 publications

Effect of silica nanoparticles on compressive properties of an epoxy polymer

Effect of silica nanoparticles on compressive properties of an epoxy polymer

Compressive behaviour of nanoclay modified aerospace grade epoxy polymer

Rate dependent multiscale modelling of fibre reinforced composites

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