scholarly journals Fibre prestressed polymer-matrix composites: a review

2016 ◽  
Vol 51 (1) ◽  
pp. 39-66 ◽  
Author(s):  
Nawras H Mostafa ◽  
ZN Ismarrubie ◽  
SM Sapuan ◽  
MTH Sultan
Keyword(s):  
Manufacturing Process ◽  
High Performance ◽  
Polymer Matrix Composites ◽  
High Stress ◽  
Reinforced Composites ◽  
Moulding Process ◽  
Residual Stress State ◽  
The Matrix ◽  
High Stress Level ◽  
Fibre Reinforced Composites

This article reviews the literature studies based on improving the mechanical properties of fibre-reinforced composites using fibre-prestressing method. The idea is characterized by pretensioning the fibres either elastically or viscoelastically prior matrix curing. The beginnings of the studies in this field were focused on reducing fibre waviness and breaking the weaker fibres by pretensioning the fibres to a relatively high stress level prior moulding process. In the last three decades, the concept of fibre prestressing had been developed to include its ability to reduce the effect of undesired residual stresses existence accompanying manufacturing process of fibre-reinforced composites. The main advantage of fibre prestressing method is to generate a desired and controlled residual stress state within the matrix in order to obstruct the initiation and propagation of cracks. Various techniques of fibre prestressing have been reviewed to show their scope of applications, developments and limitations. Therefore, the findings drawn from this review can be used for further studies in the field of fibre prestressed composites in order to select the most suitable methodology and develop it to fit the manufacturing process requirements towards a production of high-performance composites without a considerable additional cost.

High Performance Composites Using Nanotechnology

2008 ◽  
Vol 32 ◽  
pp. 149-152 ◽  
Author(s):  
Monika Bauer ◽  
O. Kahle ◽  
S. Landeck ◽  
C. Uhlig ◽  
R. Wurzel
Keyword(s):  
Mechanical Properties ◽  
Traffic Engineering ◽  
High Performance ◽  
Polymer Matrix Composites ◽  
Lightweight Design ◽  
Aviation Industry ◽  
Matrix Composites ◽  
Reinforced Composites ◽  
The Matrix ◽  
Interlaminar Shear

Lightweight design, using high performance composites, which directly yields a reduced need for fuel is in the focus of new developments for traffic engineering. The increased substitution of traditional, metal based materials by fibre-reinforced composites in the aviation industry exemplifies this trend. In addition to mechanical properties, e.g. an increase in strength, that leads to direct weight savings, or improved dynamical performance, which translates into longer maintenance intervals, i.e. longer service-life. In the field of fibre-reinforced polymer matrix composites possible contributions from nanotechnology are currently reviewed. The modification of the matrix by introducing a “nanophase” has attracted most attention up-to-date. Additional approaches include modification of traditional reinforcements, as well as the development of new reinforcing materials. Desired improvements include mechanical properties, interlaminar shear strength, reinforcement in z-direction, fiber-matrix adhesion, and obtaining new functionalities. Starting from a summary of the most important effects of nano-modifiers in polymeric matrices, the presentation will review published results on the modification of thermoset matrix fiber-reinforced composites by using nanotechnology, as well as some of our own work in that field. Furthermore, applications of such modified composites in component parts are discussed.

scholarly journals Behaviour of UHPFRCs in compression under high stress-rates

2018 ◽  
Vol 183 ◽  
pp. 02005
Author(s):  
Ezio Cadoni ◽  
Matteo Dotta ◽  
Daniele Forni
Keyword(s):  
Reinforced Concrete ◽  
Mechanical Behaviour ◽  
High Performance ◽  
High Stress ◽  
Slight Reduction ◽  
Fibre Reinforcement ◽  
Fibre Reinforced Concrete ◽  
Dynamic Event ◽  
The Matrix ◽  
High Performance Fibre

The paper presents the results obtained on cylindrical Ultra High Performance Fibre Reinforced Concrete specimens with diameter of 30mm and a height of 60mm under compression at high stress rate (1.7–2.3 TPa/s). Four different percentages of fibre reinforcement are considered (1, 2, 3, and 4% fibre content) and compared with the results of the matrix (UHPC). A slight reduction of the strength and fracture time with the introduction of fibres is observed. The experimental results are analysed and discussed with the intent to better understand the mechanical behaviour of UHPFRC materials in case of dynamic event under service loading conditions.

Fibre-Matrix Interface Development during High Temperature Exposition of Long Fibre Reinforced SiOC Matrix

2013 ◽  
Vol 592-593 ◽  
pp. 401-404
Author(s):  
Zdeněk Chlup ◽  
Martin Černý ◽  
Adam Strachota ◽  
Martina Halasova ◽  
Ivo Dlouhý
Keyword(s):  
High Temperature ◽  
Crack Formation ◽  
Fracture Behaviour ◽  
Point Of View ◽  
Reinforced Composites ◽  
Matrix Interface ◽  
Significant Damage ◽  
The Matrix ◽  
Fibre Matrix ◽  
Fibre Reinforced Composites

The fracture behaviour of long fibre reinforced composites is predetermined mainly by properties of fibre-matrix interface. The matrix prepared by pyrolysis of polysiloxane resin possesses ability to resist high temperatures without significant damage under oxidising atmosphere. The application is therefore limited by fibres and possible changes in the fibre matrix interface. The study of development of interface during high temperature exposition is the main aim of this contribution. Application of various techniques as FIB, GIS, TEM, XRD allowed to monitor microstructural changes in the interface of selected places without additional damage caused by preparation. Additionally, it was possible to obtain information about damage, the crack formation, caused by the heat treatment from the fracture mechanics point of view.

scholarly journals Exploration of Tensile, Flexural and Chemical Inertness Properties of Sisal Fibre Reinforced Polymer Composites-Surface Analysis

2021 ◽  
pp. 220-224
Author(s):  
N. Selva Kumar ◽  
T. M. Sakthi Muruga ◽  
S. Ganapathy ◽  
K. Arulkumar
Keyword(s):  
Surface Analysis ◽  
Fibre Surface ◽  
Reinforced Composites ◽  
Sisal Fibre ◽  
Reinforced Polymer ◽  
Chemical Inertness ◽  
Fibre Composites ◽  
The Matrix ◽  
Fibre Reinforced Polymer ◽  
Fibre Reinforced Composites

Our Experimentation finds, reaction of fibre external analysis on tensile, flexural and chemical resistance properties were studied for sisal fibre reinforced composites. Fibre surface analysis has done to produce link between fibre and the matrix to improve the mechanical properties. Fibre surface analysis were done by boiled the sisal fibres in different % of NaOH and treated the fibres in different % of NaOH, treated in acetic acid and methanol. Polyester resin have used as the matrix for preparing the composites and these properties for Natural sisal fibre reinforced composites were also studied. From the results it was observed that 25% NaOH boiled sisal fibre reinforced composites have higher tensile, flexural properties than other composites. Natural sisal fibre composites show fewer properties than treated composites. Chemical inertness properties indicate that all sisal fibre reinforced composites are resistance to all chemical agents except carbon tetra chloride.

Investigation on the Tensile Strength of Treated and Untreated Woven Sugar Palm Fibre Reinforced Composites

2014 ◽  
Vol 660 ◽  
pp. 588-592 ◽  
Author(s):  
Shahruddin Mahzan ◽  
Wahieda M. Bahtiar ◽  
Zaleha Mohamad
Keyword(s):  
Tensile Strength ◽  
Fibre Composite ◽  
High Stress ◽  
Environmental Benefits ◽  
Natural Fibres ◽  
Reinforced Composites ◽  
Treatment Processes ◽  
Sugar Palm Fibre ◽  
Fibre Reinforced Composites ◽  
Palm Fibre

Natural fibres offer environmental benefits such as biodegradable and can be obtained from renewable resources. However, there is lack of investigations done to characterize and compare different types and orientation done on the natural fibres. This paper determines the tensile strength of sugar palm fibres under various treatment processes. The composites were fabricated using woven sugar-palm fibre treated with alkali and acid and used epoxy resin as the matrices for the composite. The tensile test was done to determine the tensile strength of the composite and the surface morphological analysis was done using SEM. The results demonstrated that the composite with the alkali treated fibres produced higher tensile strength compared to untreated and acid treated fibres. With these properties, it shows that treated woven sugar-palm fibre composite can withstand high stress load during operation compared to untreated fibres reinforced composites.

scholarly journals Predicting strength of Finnish birch veneers based on three different failure criteria

Holzforschung ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Maximilian Pramreiter ◽  
Sabine C. Bodner ◽  
Jozef Keckes ◽  
Alexander Stadlmann ◽  
Florian Feist ◽  
...  
Keyword(s):  
High Performance ◽  
Fibre Orientation ◽  
Pearson Correlation ◽  
Failure Criteria ◽  
Reinforced Composites ◽  
Threshold Values ◽  
X Ray Scattering ◽  
Out Of Plane ◽  
Actual Strength ◽  
Fibre Reinforced Composites

Abstract The use of wood in high-performance composites based on laminated veneer products, plywood or wood hybrid elements thereof requires accurate prediction of strength of each individual ply. Previous research has shown that one dominating factor influencing the strength of birch veneers is the fibre orientation. The present study investigates the validity of the failure criteria after Tsai-Hill, Hoffmann and Kollmann for thin birch veneers under tensile loading. The fibre orientation in- and out-of-plane was measured by means of wide-angle X-ray scattering. Tensile strength and threshold values were determined in laboratory experiments. Pearson correlation between the predicted strength and actual strength ranged from 0.836 up to 0.883. Best correlation (r = 0.883) was achieved for Kollmann using a combined angle between in- and out-of-plane fibre orientation. It was shown that the failure criteria commonly used for manmade fibre reinforced composites are also applicable for thin birch veneers.

The effect of microscale residual stress from thermal cooldown on the nanoindentation properties of fibre-reinforced composites

2016 ◽  
Vol 50 (29) ◽  
pp. 4147-4158 ◽  
Author(s):  
M Hardiman ◽  
TJ Vaughan ◽  
CT McCarthy
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Fibre Composite ◽  
Three Dimensional ◽  
Interfacial Region ◽  
Indentation Modulus ◽  
Reinforced Composites ◽  
Carbon Fibre Composite ◽  
Residual Stress State ◽  
Fibre Reinforced Composites

A two-step finite element framework is presented that examines the effect of microscale thermal residual stress on the nanoindentation properties of fibre-reinforced composites. Firstly, micromechanical modelling is used to determine the residual stress state following thermal cooldown of a carbon-fibre composite material from cure temperature. A three-dimensional finite element nanoindentation model is then used to characterise the effects of residual stress on material properties determined by nanoindentation theory. The results show that the hardness of the matrix pockets decreases following thermal cooldown due to the existence of equibiaxial tensile residual stresses. The hardness property is also found to decrease for the majority of interfacial region stress states, while the microstructural areas where the effects of the residual stress are nullified are determined. The indentation modulus property is relatively insensitive to the microstructural residual stress, and thus is the recommended indentation property to be determined when carrying out a comparative parametric analysis between microstructural regions. The property changes are shown to be insensitive to any errors associated with contact area estimation using the Oliver and Pharr method.

scholarly journals Fabrication of lightweight and high-strength carbon fiber-reinforced poly(ethylene-2,6-naphthalene) solid and foam composites

2020 ◽  
Vol 29 ◽  
pp. 2633366X2092255
Author(s):  
Yi-Fan Chen ◽  
Ying-Guo Zhou ◽  
Ming Huang
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
High Performance ◽  
High Strength ◽  
Thermoplastic Composites ◽  
Reinforced Composites ◽  
Foaming Behavior ◽  
The Matrix ◽  
Poly Ethylene ◽  
Engineering Polymers

Poly(ethylene-2,6-naphthalene) (PEN) is one of the most important engineering polymers with high performance. However, the effects and foaming behavior of carbon fiber (CF)-reinforced PEN (CFRPEN) remain to be explored. In this study, PEN was used as the matrix for CF-reinforced composites, and its foaming behavior and mechanical properties were investigated. High mechanical properties can be evaluated through comparison with other similar CF-reinforced thermoplastic composites. A fabrication method to generate lightweight and high-strength CFRPEN composites is hence proposed.

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