Fibre-matrix adhesion and its relationship to composite mechanical properties

1993 ◽  
Vol 28 (3) ◽  
pp. 569-610 ◽  
Author(s):  
L. T. Drzal ◽  
M. Madhukar
Keyword(s):  
Mechanical Properties ◽  
Matrix Adhesion ◽  
Fibre Matrix

scholarly journals Unidirectional Cordenka Fibre-Reinforced Furan Resin Full Biocomposite: Properties and Influence of High Fibre Mass Fraction

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Talent Malaba ◽  
Jiajun Wang
Keyword(s):  
Mechanical Properties ◽  
Mass Fraction ◽  
Shear Fracture ◽  
Tensile Fracture ◽  
Initial Increase ◽  
Subsequent Increase ◽  
Matrix Adhesion ◽  
Furan Resin ◽  
High Fibre ◽  
Fibre Matrix

A full biocomposite was fabricated from Cordenka CR fibre and furan resin. High fibre mass fractions (FMF) were achieved by pressing the CR fibres into unidirectional sheets prior to incorporation into the resin. Results of testing indicated that the tensile properties of the biocomposite were improved by the initial increase of FMF from 51 to 64%, with a subsequent increase of FMF to 75% resulting in a deterioration of those properties. Examination of the tensile fracture surfaces with a scanning electron microscope (SEM) revealed moderate deterioration in fibre-matrix adhesion after the initial increase of FMF. Further increase of the FMF to 75% was shown by SEM to result in worse fibre-matrix adhesion. On the other hand, the flexural, interlaminar-shear, and dynamic mechanical properties were adversely affected by the increase in fibre-mass fraction from 51 through 75%. These effects were mainly attributed to reduced fibre wetting that resulted in weakened fibre-matrix interfacial bonding and subsequent poor stress exchange at the fibre-matrix interface. Observations made with a digital microscope revealed normal crack behaviour in the laminated composite, and the shear fracture modes were I and II. This biocomposite has mechanical properties comparable to those of flax and glass fibre-reinforced furan resin biocomposites.

Hydrothermal Ageing of GF/PP Composites: When Glass/Polymer Adhesion Favours Water Entrapment

2005 ◽  
Vol 13 (1) ◽  
pp. 27-35 ◽  
Author(s):  
D. Larivière ◽  
P. Krawczak ◽  
C. Tibéri ◽  
P. Lucas
Keyword(s):  
Mechanical Properties ◽  
Fibre Strength ◽  
Fibre Reinforcement ◽  
Long Term Effects ◽  
Matrix Adhesion ◽  
Transverse Tensile ◽  
Tension Properties ◽  
The Matrix ◽  
Pp Composites ◽  
Fibre Matrix

This study aims to assess the effects of ageing in boiling water on the transverse tensile mechanical properties of unidirectional commingled GF/PP composites, as well as the influence of the fibre/matrix adhesion on the water absorption and desorption mechanisms. For this purpose, different interfacial qualities were obtained by a modification of the fibre reinforcement sizing (polypropylene specific sizing, or no sizing), and of the matrix (with or without coupling agent). A very good retention of the mechanical properties was observed for those composites which had been treated so as to improve the fibre/matrix adhesion. It is also shown that the better the adhesion, the longer the water remained inside the composite material. This induced effect appears to be the counterpart of the protecting role against moisture of a strong interface. The interfacial interactions act as barriers both during absorption and during desorption. This leads to water molecule entrapment. Hence, the persistence of water trapped at the interfaces in the case of sized glass fibres composites leads us to recommend investigations on the long term effects on longitudinal tension properties, since the effects of zero-stress ageing are known to reduce fibre strength.

scholarly journals A Review on Mechanical Properties of Natural Fibre Reinforced Polymer Composites under Various Strain Rates

2021 ◽  
Vol 5 (5) ◽  
pp. 130
Author(s):  
Tan Ke Khieng ◽  
Sujan Debnath ◽  
Ernest Ting Chaw Liang ◽  
Mahmood Anwar ◽  
Alokesh Pramanik ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Strain Rate ◽  
Polymer Composites ◽  
Stress Transfer ◽  
Natural Fibre ◽  
Transfer Efficiency ◽  
Strain Rates ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Fibre Matrix

With the lightning speed of technological evolution, the demand for high performance yet sustainable natural fibres reinforced polymer composites (NFPCs) are rising. Especially a mechanically competent NFPCs under various loading conditions are growing day by day. However, the polymers mechanical properties are strain-rate dependent due to their viscoelastic nature. Especially for natural fibre reinforced polymer composites (NFPCs) which the involvement of filler has caused rather complex failure mechanisms under different strain rates. Moreover, some uneven micro-sized natural fibres such as bagasse, coir and wood were found often resulting in micro-cracks and voids formation in composites. This paper provides an overview of recent research on the mechanical properties of NFPCs under various loading conditions-different form (tensile, compression, bending) and different strain rates. The literature on characterisation techniques toward different strain rates, composite failure behaviours and current challenges are summarised which have led to the notion of future study trend. The strength of NFPCs is generally found grow proportionally with the strain rate up to a certain degree depending on the fibre-matrix stress-transfer efficiency. The failure modes such as embrittlement and fibre-matrix debonding were often encountered at higher strain rates. The natural filler properties, amount, sizes and polymer matrix types are found to be few key factors affecting the performances of composites under various strain rates whereby optimally adjust these factors could maximise the fibre-matrix stress-transfer efficiency and led to performance increases under various loading strain rates.

scholarly journals Dynamic Response of Thermally Bonded Bicomponent Fibre Nonwovens

2011 ◽  
Vol 70 ◽  
pp. 405-409 ◽  
Author(s):  
Emrah Demirci ◽  
Memiş Acar ◽  
Behnam Pourdeyhimi ◽  
Vadim V. Silberschmidt
Keyword(s):  
Mechanical Properties ◽  
Dynamic Response ◽  
Fibre Diameter ◽  
Orientation Distribution ◽  
Nonwoven Fabric ◽  
Woven Fabrics ◽  
Core Material ◽  
Finite Element Software ◽  
Anisotropic Mechanical Properties ◽  
Fibre Matrix

Having a unique microstructure, nonwoven fabrics possess distinct mechanical properties, dissimilar to those of woven fabrics and composites. This paper aims to introduce a methodology for simulating a dynamic response of core/sheath-type thermally bonded bicomponent fibre nonwovens. The simulated nonwoven fabric is treated as an assembly of two regions with distinct mechanical properties. One region - the fibre matrix – is composed of non-uniformly oriented core/sheath fibres acting as link between bond points. Non-uniform orientation of individual fibres is introduced into the model in terms of the orientation distribution function in order to calculate the structure’s anisotropy. Another region – bond points – is treated in simulations as a deformable bicomponent composite material, composed of the sheath material as its matrix and the core material as reinforcing fibres with random orientations. Time-dependent anisotropic mechanical properties of these regions are assessed based on fibre characteristics and manufacturing parameters such as the planar density, core/sheath ratio, fibre diameter etc. Having distinct anisotropic mechanical properties for two regions, dynamic response of the fabric is modelled in the finite element software with shell elements with thicknesses identical to those of the bond points and fibre matrix.

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