Impact and delamination failure of woven-fabric composites

Kim, Jang Kyo; Sham, Man Lung

doi:10.1016/s0266-3538(99)00166-9

Cited by 306 publications

(187 citation statements)

References 47 publications

Supporting

Mentioning

183

Contrasting

Unclassified

Order By: Relevance

“…damages upon the structural life of the material [6][7][8], produce a more favourable result than the one caused upon similar fibre and matrix UD material systems [9][10][11][12].…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

See 1 more Smart Citation

Impact damage and CAI strength of a woven CFRP material with fire retardant properties

Giannopoulos

Theotokoglou

Zhang

2016

Composites Part B: Engineering

View full text Add to dashboard Cite

“…damages upon the structural life of the material [6][7][8], produce a more favourable result than the one caused upon similar fibre and matrix UD material systems [9][10][11][12].…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

“…Fracture mechanisms and failure sequences are documented from observations [6][7][8] but parametric analytic formulations for predicting the impact performance have not attained yet the maturity level of the unidirectional ones.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Impact damage and CAI strength of a woven CFRP material with fire retardant properties

Giannopoulos

Theotokoglou

Zhang

2016

Composites Part B: Engineering

View full text Add to dashboard Cite

“…However, in the absence of through-thickness reinforcement, thermosetting polymer based 4 composites have low interlaminar and intralaminar fracture toughness, making them susceptible to matrix-5 dominated cracking [1,2]. Many techniques have been developed to address these drawbacks by, for 6 example, inserting out-of-plane fibers through mechanical punching [3], stitching [4], 3D weaving [5], 7…”

Section: Introductionmentioning

confidence: 99%

Multi-scale toughening of fibre composites using carbon nanofibres and z-pins

Ladani

Ravindran

et al. 2016

Composites Science and Technology

View full text Add to dashboard Cite

11Improving the interlaminar fracture toughness of fibre-reinforced composites based on thermosetting 12 polymeric matrices is of significant interest to a broad range of applications. In the present work we report a 13 multi-scale approach to synergistically toughen composites by combining nano-and macro-scale 14 reinforcements inspired by natural composite materials. Carbon reinforcements with two different length 15 scales are used: nano-scale carbon nanofibres (~100 nm diameter) and macro-scale carbon z-pins (~280 µm 16 diameter) to reinforce continuous carbon-fibre composites in the through-thickness direction. The resultant 17 composite, featuring three-dimensional reinforcement architecture, possesses triple toughening mechanisms 18 at three different scales, thus yielding a synergistic effect. At the nano-scale, the carbon nanofibres alone 19 promote high mode I delamination resistance (~70% increase in interlaminar fracture energy) by multiple 20 intrinsic and extrinsic toughening processes around the crack tip. The macro-size carbon z-pins, together 21 with the crossover continuous fibres, promote a strong extrinsic toughening mechanism (~200% increase in 22 the interlaminar fracture energy) behind the crack tip and over a larger length-scale via both the z-pins and 23 crossover fibres bridging the crack faces. When used concurrently, the nanofillers and z-pins promote a 24 higher toughness under quasi-static loading (~400% increase in fracture energy) than when used separately 25 due to a multiplicative effect from the interplay between intrinsic and extrinsic toughening processes 26 operative ahead of, and behind, the crack tip. Under mode I interlaminar cyclic-fatigue loading, the multi-27 scale laminates show a strong improvement in resistance against fatigue delamination growth. Similar to the 28 synergistic increase in fracture energy, a greater increase in the delamination fatigue resistance occurs when 29 both are active together. However, the results indicate that the synergistic effect of the multi-scale 30 toughening is statistically significant under quasi-static loading but not under fatigue loading. A very small 31 reduction (~2%) in the tensile strength is observed for the multi-scale reinforced laminates. 32 33

show abstract

“…It is proposed that the trend observed in the work is influenced from the local fluctuations in toughness throughout the interlaminar region, which is expected to result from the bi-directional weave. In addition to the observed step-like load behaviour, bi-directional cross-plies have higher fracture toughness than UD due to the 90 o fibres acting as built-in crack arrestors [51], but, they do not display fibre bridging. Thus, comparisons with UD interlaminar fracture toughness testing should be avoided, as fibre bridging is an effective artificial fracture toughness enhancer [52,53].…”

Section: Interlaminar Fracture Toughnessmentioning

confidence: 92%

Development of sizing-free multi-functional carbon fibre nanocomposites

Pozegic

Jayawardena

Chen

et al. 2016

Composites Part A: Applied Science and Manufacturing

View full text Add to dashboard Cite

General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms AbstractHigh quality multi-walled carbon nanotubes (CNTs) grown at high density using a low temperature growth method are used as an alternative material to polymer sizing and is utilised in a series of epoxy composites reinforced with carbon fibres to provide improved physical and electrical properties. We report improvements for sizing-sensitive mechanical and physical properties, such as the interfacial adhesion, shear properties and handling of the fibres, whilst retaining resin-infusion capability. Following fibre volume fraction normalisation, the carbon nanotube-modified carbon fibre composite offers improvements of 146 % increase in Young's modulus; 20% increase in ultimate shear stress; 74 % increase in shear chord modulus and an 83 % improvement in the initial fracture toughness. The addition of CNTs imparts electrical functionalisation to the composite, enhancements in the surface direction are 400%, demonstrating a suitable route to sizing-free composites with enhanced mechanical and electrical functionality.

show abstract

Impact and delamination failure of woven-fabric composites

Cited by 306 publications

References 47 publications

Impact damage and CAI strength of a woven CFRP material with fire retardant properties

Impact damage and CAI strength of a woven CFRP material with fire retardant properties

Multi-scale toughening of fibre composites using carbon nanofibres and z-pins

Development of sizing-free multi-functional carbon fibre nanocomposites

Contact Info

Product

Resources

About