Matrix strengthening in continuous fibre reinforced composites under monotonic and cyclic loading conditions

1974 ◽  
Vol 9 (3) ◽  
pp. 359-368 ◽  
Author(s):  
R. E. Lee ◽  
S. J. Harris
Keyword(s):  
Cyclic Loading ◽  
Reinforced Composites ◽  
Loading Conditions ◽  
Continuous Fibre ◽  
Fibre Reinforced Composites

Effect of carbon fibre on reinforcement of thermoplastics using FDM and RSM

2019 ◽  
pp. 089270571988689 ◽  
Author(s):  
Fausz Naeem Chaudhry ◽  
Shahid Ikramullah Butt ◽  
Aamir Mubashar ◽  
Ali Bin Naveed ◽  
Syed Hussain Imran ◽  
...  
Keyword(s):  
Carbon Fibre ◽  
Fused Deposition Modelling ◽  
Reinforced Composites ◽  
Fused Deposition ◽  
Continuous Fibre ◽  
Manufacturing Operations ◽  
Testing Parameter ◽  
Reinforced Thermoplastics ◽  
3D Printing Technique ◽  
Fibre Reinforced Composites

Continuous fibre-reinforced composites have significant industrial importance and usage. However, they are limited by design considerations and high-cost manufacturing operations. This article presents a way forward to utilize Fused Deposition Modelling – a 3D printing technique – to manufacture continuous carbon fibre-reinforced thermoplastics. Several parameters including number of reinforced layers, material impact and interlayer gap have been investigated and optimized using response surface method. Successful incorporation of modified novel nozzle design in a dual nozzle setup resulted in the realization of controlled manufacturing of continuously reinforced composites leading to reinforced yet smooth surface finished samples. Several samples were made, and mechanical testing, parameter optimization, strength calculations and fracture analysis were carried out. For polylactic acid (PLA), tensile strength of 112 MPa and flexural strength of 164 MPA were achieved – an almost 3 times increase from pure PLA printing. The approach presented in this article can forward continuous fibre-reinforced composites for industrial usage with its controlled fibre layup and programmable thread orientation features.

The effects of different fibre packing geometries on the transverse matrix strain magnification and fibre strain reduction in uniaxially aligned continuous fibre-reinforced composites

2016 ◽  
Vol 50 (29) ◽  
pp. 4159-4170 ◽  
Author(s):  
Maina Maringa ◽  
LM Masu
Keyword(s):  
Fibre Volume ◽  
Reinforced Composites ◽  
Bond Failure ◽  
Volume Fractions ◽  
Continuous Fibre ◽  
Fibre Strain ◽  
Square Array ◽  
Longitudinal Strains ◽  
Fibre Packing ◽  
Fibre Reinforced Composites

Expressions for transverse matrix strain magnification and fibre strain reduction are derived for square and hexagonal fibre array reinforced composites. Respective transverse matrix and fibre strain magnification and reduction, for the square arrays are shown to be higher for all reinforcing fibre volume fractions than those for the hexagonal arrays. The respective magnification and reduction of the transverse matrix and fibre strains are shown to decrease with increasing values of the ratio of elastic modulus ( Em/ Ef) for both reinforcing fibre arrays. The magnified transverse matrix strains in axially loaded longitudinally aligned continuous fibre-reinforced composites are shown to be higher than the applied longitudinal strains for all square array reinforcing fibre volume fractions and for all hexagonal array reinforcing fibre volumes fractions above 31%. This raises possibilities of longitudinal matrix splitting before interfacial bond failure and transverse matrix failure, in a strain based rather than stress-based failure mode.

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