Mode I and mode II fracture toughness of E-glass non-crimp fabric/carbon nanotube (CNT) modified polymer based composites

Seyhan, Abdullah Tuğrul; Tanoğlu, Metin; Schulte, Karl

doi:10.1016/j.engfracmech.2008.08.003

Cited by 190 publications

(57 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Inadequate dispersion may yield little or no structural benefit [8] and a reduction in fracture propagation toughness, resulting from the addition of CNTs in the polymer matrix, has consequently been reported [18]. CNTs may be grown as a random mass of fibres collected continuously from the reactor atmosphere, (hence requiring dispersion for most purposes) or as adjacent/aligned 'carpets' or 'forests' on smooth inert substrates [19].…”

Section: Introductionmentioning

confidence: 99%

An investigation of Mode I and Mode II fracture toughness enhancement using aligned carbon nanotubes forests at the crack interface

Falzon¹,

Hawkins

Huynh

et al. 2013

Composite Structures

View full text Add to dashboard Cite

A novel approach for introducing aligned multi-walled carbon nanotubes (MWCNTs) in a carbon-fibre composite pre-impregnated (prepreg) laminate, to improve the through-thickness fracture toughness, is presented. Carbon nanotube (CNT) 'forests' were grown on a silicon substrate with a thermal oxide layer, using a chemical vapour deposition (CVD) process. The forests were then transferred to a pre-cured laminate interface, using a combination of pressure and heat, while maintaining through-thickness CNT alignment. Standard Mode I and four-point bend end-notched flexure Mode II tests were undertaken on a set of specimens and compared with pristine specimens.Mode I fracture toughness for T700/M21 laminates was improved by an average of 31% while for T700/SE84LV specimens, an improvement of 61% was observed. Only T700/M21 specimens were tested in Mode II which yielded an average fracture toughness improvement of 161%. Scanning Electron Microscopy (SEM) showed good wetting of the CNT forest as well as evidence of penetration of the forest into the adjacent plies.

show abstract

Section: Introductionmentioning

confidence: 99%

An investigation of Mode I and Mode II fracture toughness enhancement using aligned carbon nanotubes forests at the crack interface

Falzon¹,

Hawkins

Huynh

et al. 2013

Composite Structures

View full text Add to dashboard Cite

show abstract

“…This could indicate some problems during the dispersion process and at interface nano-modified matrix/fibers. To try to overcome this problem Seyhan et al 26 used the three-roll mill. Although the dispersion quality was improved, the matters of CNTs loadings remained.…”

Section: Introductionmentioning

confidence: 99%

Nano-engineered composites: interlayer carbon nanotubes effect

et al. 2013

View full text Add to dashboard Cite

The concept of carbon nanotube interlayer was successfully introduced to carbon fiber/epoxy composites. This new hybrid laminated composites was characterized by Raman spectroscopy, X-ray diffraction, scanning electron microscopy and tensile tests. An increase on peak stress close to 85% was witnessed when CNTs interlayer with 206.30 mg was placed to carbon fiber/epoxy laminates. The failure mechanisms are associated to CNTs distribution between and around carbon fibers. These CNTs are also responsible for crack bridging formation and the increase on peak stress. Initial stiffness is strongly affected by the CNT interlayer, however, changes on stiffness is associated to changes on nano/micro-structure due to damage. Three different behaviors can be described, i.e. for interlayers with ≈ 60 mg of CNT the failure mode is based on cracks between and around carbon fibers, while for interlayers with CNT contents between 136 mg and 185 mg cracks were spotted on fibers and inside the CNT/matrix mix. Finally, the third failure mechanism is based on carbon fiber breakage, as a strong interface between CNT/matrix mix and carbon fibers is observed.

show abstract

“…Numerous methods have been utilized to study the inter-laminar strength and the effect of z-fiber reinforcement on laminated composites; (i) mode-I fracture toughness using double cantilever beam (DCB) test [13][14][15][16], (ii) mode-II fracture behavior using endnotch flexure (ENF) test [14,15], and (iii) short beam shear (SBS) test [15,17,18] to determine the inter-laminar shear strength (ILSS). Other fixtures have also been designed to study the effect of combined loading [9].…”

Section: Introductionmentioning

confidence: 99%

Monotonic and cyclic short beam shear response of 3D woven composites

Walter

Subhash

Sankar

et al. 2010

Composites Science and Technology

View full text Add to dashboard Cite

a b s t r a c tMonotonic, multi-step and cyclic short beam shear tests were conducted on 2D and 3D woven composites. The test results were used to determine the effect of z-yarns on the inter-laminar shear strength as well as the multi-loading behavior. The presence of z-yarns was found to affect not only the inter-laminar shear strength of the composite but also the behavior of the composite beyond the elastic limit. Microscopic examination of the damaged specimens revealed large delamination cracks in 2D woven composites while delamination cracks were hindered by z-yarns in 3D composites. This crack arrest phenomena resulted in a reduction in inter-laminar crack lengths and a higher distribution of the micro-cracks throughout the 3D composite. The multi-step and cyclic loading tests are found to be useful in the monitoring of specimen behavior during short beam shear testing. The induced damage was quantified in terms of the loss of strength and stiffness during each loading cycle. It was found that while the 2D composites have higher damage resistance, the 3D composites have a higher damage tolerance.

show abstract

Mode I and mode II fracture toughness of E-glass non-crimp fabric/carbon nanotube (CNT) modified polymer based composites

Cited by 190 publications

References 18 publications

An investigation of Mode I and Mode II fracture toughness enhancement using aligned carbon nanotubes forests at the crack interface

An investigation of Mode I and Mode II fracture toughness enhancement using aligned carbon nanotubes forests at the crack interface

Nano-engineered composites: interlayer carbon nanotubes effect

Monotonic and cyclic short beam shear response of 3D woven composites

Contact Info

Product

Resources

About