PLASMA POLYMERIZATION ON UNSIZED BASALT FIBRES FOR IMPROVING THE INTERFACIAL STRENGTH WITH POLYMER MATRICES

2021 ◽  
Author(s):  
MATTEO LILLI ◽  
MILAN ZVONEK ◽  
VLADIMIR CECH ◽  
CHRISTINA SCHEFFLER ◽  
JACOPO TIRILLÒ ◽  
...  
Keyword(s):  
Plasma Polymerization ◽  
Interfacial Strength ◽  
Chemical Vapor ◽  
Single Fibre ◽  
Matrix Composites ◽  
Promising Alternative ◽  
Pull Out ◽  
The Matrix ◽  
Polymeric Matrix Composites ◽  
Fibre Matrix

Basalt fibres are becoming a promising alternative to synthetic fibres as a green reinforcement phase in polymeric matrix composites, showing excellent mechanical, chemical and thermal properties. In this work we synthetized tetravinylsilane (TVS) or a mixture formed by tetravinylsilane and different percentages of oxygen on the surface of unsized basalt fibres through the Plasma-Enhanced Chemical Vapor Deposition (PECVD) technique for improving the fibre/matrix adhesion. Single fibre tensile test proved the effectiveness of the process, without any degradation of the mechanical properties of modified basalt fibres. Finally, through pull out tests, the interfacial properties of basalt fibres were studied, measuring increases up to 80% of the IFSS for modified fibres compared to neat fibres. This result is the consequence of a greater chemical compatibility between the fibres and the matrix, thanks to the presence of a higher number of Si-O-C groups, and of a mechanical interlocking effect promoted by the increased surface roughness of the plasma-modified fibres.

Matrix cracking and the mechanical behaviour of SiC─CAS composites

1992 ◽  
Vol 437 (1899) ◽  
pp. 109-131 ◽  
Keyword(s):  
Elastic Properties ◽  
Three Dimensional ◽  
Matrix Cracking ◽  
Repeated Loading ◽  
Matrix Composites ◽  
Pull Out ◽  
Matrix Cracks ◽  
Brittle Matrix Composites ◽  
Dimensional Network ◽  
The Matrix

An experimental investigation has been carried out on the mechanical properties of unidirectional (0) 12 , (0, 90) 3S , (±45, 0 2 ) S , and (±45) 3S composites consisting of CAS glass ceramic reinforced with Nicalon SiC fibres. Measurements have been made of the elastic properties and of the tensile, compression and shear strengths of the composites, and these have been supported by a detailed study of the damage which occurs during monotonic and repeated loading. These damage studies have been carried out by means of edge replication microscopy and acoustic emission monitoring. The elastic properties of the composites are, by and large, close to the values that would be predicted from the constituent properties and lay-up sequences, but their strengths are lower than expected, and it appears that the Nicalon reinforcing fibre has been seriously degraded during manufacture. The fracture energy is much higher than predicted from observations of fibre pull-out, and it is suggested that the energy required to form a close three-dimensional network of matrix cracks could account for the high apparent toughness. The matrix cracking stress can be predicted reasonably closely by the Aveston, Cooper and Kelly model of cracking in brittle matrix composites, but it is shown that subcritical microcracks can form and/or grow at stresses well below the predicted critical values without affecting composite properties.

Interfacial Shear Stress in Kenaf/Polyethylene Terephthalate Fiber Reinforced Polyoxymethylene Composite

2015 ◽  
Vol 786 ◽  
pp. 74-78
Author(s):  
Yakubu Dan-Mallam ◽  
M.S. Abdul Majid ◽  
Mohamad Zaki Abdullah
Keyword(s):  
Interfacial Shear Stress ◽  
Single Fibre ◽  
Interfacial Shear ◽  
Interfacial Bonding ◽  
Test Method ◽  
Compression Moulding ◽  
Pull Out ◽  
Kenaf Fibre ◽  
The Matrix ◽  
Fibre Reinforced Polymer

The mechanical properties of fibre reinforced polymer composites strongly depend on the interfacial bonding between fibre and matrix. The main objective of this paper is to compare the interfacial bonding between kenaf fibre reinforced POM with that of PET fibre reinforced POM in a hybrid composite. Continuous twisted kenaf, and PET yarn were used for the investigation. Each fibre yarn was half embedded in POM by compression moulding. The yarns were extracted from the matrix by single fibre pull out test method. The result of the investigation revealed that the interfacial shear strength of approximately 31.4 MPa between kenaf and POM is higher compared to 24.3 MPa obtained between PET fibre and POM. This may be due to higher surface energy of kenaf fibre with respect to POM in the composite The FESEM micrograph further demonstrates good interfacial adhesion between kenaf and POM in the composite.

Interfacial phenomena in the fracture resistance of interfaces

1988 ◽  
Vol 46 ◽  
pp. 720-721
Author(s):  
A. G. Evans
Keyword(s):  
Fracture Resistance ◽  
Mechanical Response ◽  
Mechanical Performance ◽  
Friction Stress ◽  
Matrix Composites ◽  
Low Friction ◽  
Fiber Failure ◽  
Pull Out ◽  
Brittle Matrix Composites ◽  
The Matrix

In composite systems, the mechanical response of interfaces to the approach of cracks that initially form either in the matrix or in the fiber dominates the mechanical performance. In particular, in brittle matrix composites, the interface must have a sufficiently low fracture resistance compared with that of both the fiber and matrix that the crack diverts into the interface and debonds the fiber, Thereafter, the debonded fiber must be able to slide against the matrix with a low friction stress in order to inhibit fiber failure and thus enhance pull-out. These processes are schematically illustrated in Fig. 1. Mechanics investigations have established requirements concerning debonding and sliding that must be satisfied in order to achieve good composite properties. At the simplest level, these studies reveal that the fracture energy of the interface should be less than about one-third that of either the fiber or the matrix.

Modelling of Fibre-Matrix Interface of Brittle Matrix Long Fibre Composite by Application of Cohesive Zone Method

2011 ◽  
Vol 465 ◽  
pp. 231-234 ◽  
Author(s):  
Vladislav Kozák ◽  
Zdeněk Chlup
Keyword(s):  
Cohesive Zone ◽  
Room Temperature ◽  
Fibre Composite ◽  
Ceramic Matrix Composites ◽  
Matrix Composites ◽  
Matrix Interface ◽  
Toughening Mechanism ◽  
Zone Method ◽  
Pull Out ◽  
Fibre Matrix

Ceramic matrix composites reinforced by unidirectional long ceramic fibre are very perspective materials. The only disadvantage of such materials is relatively high brittleness at room temperature. The main micromechanism acting as toughening mechanism is the pull out. There are other mechanisms as crack bridging, crack deflection etc. but the primer mechanism is mentioned pull out which is governed by interface between fibre and matrix. The contribution shows a way how to predict and/or optimise behaviour of composite by application of cohesive zone method using the FEM numerical package Abaqus. The presented results from numerical calculations are compared with experimental data.

Comparison of Mechanical Properties of Banana Fibers Reinforcement in Different Thermoset Matrix Composites

2020 ◽  
Vol 1012 ◽  
pp. 20-25
Author(s):  
Fabio da Costa Garcia Filho ◽  
Michelle Souza Oliveira ◽  
Foluke Salgado de Assis ◽  
Artur Camposo Pereira ◽  
Fernanda Santos da Luz ◽  
...  
Keyword(s):  
Polymer Matrix Composites ◽  
Low Cost ◽  
Interfacial Strength ◽  
Matrix Composites ◽  
Banana Fiber ◽  
Lignocellulosic Fibers ◽  
Banana Fibers ◽  
Microscopic Evaluation ◽  
Strength Tests ◽  
The Matrix

Banana fibers are among the natural lignocellulosic fibers with greater potential for use as reinforcement in polymer matrix composites. Attractive mechanical and physical properties as well as low cost of production are considered as the main advantages on the use of such fibers. This works aims to study the mechanical behavior of the banana fiber when used as filler to the two most commonly used thermoset matrices (epoxy and polyester). The specimens were produced with up to 30 vol% of banana fibers for both polymeric matrices. Tensile strength tests as well as macroscopic and microscopic evaluation of the fractured surface were carried out. It was shown that, indeed, the banana fiber provided a substantial reinforcement for both matrices. On the other hand, mechanical strength associated with the composite epoxy/banana was more than 50% higher than the exhibit by the polyester/banana one. Such behavior could be associated with the interfacial strength regarding the fiber and the matrix.

Mechanical Properties of Particle Reinforced Resin Composites

2006 ◽  
Vol 514-516 ◽  
pp. 619-623 ◽  
Author(s):  
Amilcar Ramalho ◽  
P. Vale Antunes ◽  
M.D. Braga de Carvalho ◽  
M. Helena Gil ◽  
J.M.S. Rocha
Keyword(s):  
Mechanical Properties ◽  
Flexural Modulus ◽  
Inorganic Filler ◽  
Matrix Composites ◽  
Particle Content ◽  
Volume Percentage ◽  
Inorganic Particles ◽  
The Matrix ◽  
Concentration Degree ◽  
Polymeric Matrix Composites

The objective of the present work is the evaluation of the contents of inorganic particles in the mechanical and tribological behavior of polymeric matrix composites. In order to control easily the production of the specimens, a polyester resin was used as matrix and silica particles were added as inorganic filler. The volumetric particle content was ranged from 0 to 46%. In order to understand the influence of the inorganic load was evaluated the mechanical and tribological behaviors for several percentage of particle content was evaluated. There are several applications of inorganic fillers where their volume percentage is important, namely in dentistry. In posterior restorative resin materials, the particles percentage in volume goes up to 50 or more. In most cases spherical and irregular shaped fillers are dispersed randomly. In the studied composites the filler has irregular shape therefore the connection between the matrix and the particles is more effective. Function of the shape, concentration degree and particle size of the filler the composite mechanical properties vary greatly. All of these factors influence the mechanical properties of the particlereinforced composite, namely: wear resistance, hardness, flexural modulus, flexure strength and toughness The morphology of the failure surfaces was observed by scanning electron microscopy and the results were widely discussed.

Designing Interfaces in Inorganic Matrix Composites

MRS Bulletin ◽  
1991 ◽  
Vol 16 (4) ◽  
pp. 32-38 ◽  
Author(s):  
James A. Cornie ◽  
Ali S. Argon ◽  
Vijay Gupta
Keyword(s):  
Ceramic Matrix Composites ◽  
Interface Debonding ◽  
Matrix Composites ◽  
Stress Concentrations ◽  
Interface Shear ◽  
Pull Out ◽  
Reinforcing Fibers ◽  
The Matrix ◽  
Definition Of ◽  
Work Of Fracture

The key to controlling and predicting the properties of metal matrix composites lies in understanding and controlling the interface. When properly designed, the interface between reinforcing fibers and the matrix or protective coating can act as a mechanical fuse through a controlled delamination mechanism.Controlled delamination, in effect, results in the decoupling of fibers from early damage due to stress concentrations in the vicinity. The delamination event must precede the crack bridging and frictional pull-out mechanisms that have been so effectively demonstrated in ceramic matrix composites. The delamination event, therefore, is the necessary precondition, and so analysis of composite toughening must start with a definition of the conditions for interface debonding.This decoupling can be expressed in terms of cohesive strength of the interface, shear strength of the interface, and fiber fracture stress. In a related but alternative manner, debonding can be expressed in terms of the intrinsic work of fracture of the interface as compared to the transverse work of fracture of the fiber.

scholarly journals Electrolytic Surface Treatment for Improved Adhesion between Carbon Fibre and Polycarbonate

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2253 ◽  
Author(s):  
Jan Henk Kamps ◽  
Luke Henderson ◽  
Christina Scheffler ◽  
Ruud van der Heijden ◽  
Frank Simon ◽  
...  
Keyword(s):  
Carbon Fibre ◽  
Surface Treatment ◽  
Photoelectron Spectroscopy ◽  
Surface Characteristics ◽  
Fibre Surface ◽  
Single Fibre ◽  
Optimum Level ◽  
Pull Out ◽  
Force Displacement ◽  
Fibre Matrix

To achieve good mechanical properties of carbon fibre-reinforced polycarbonate composites, the fibre-matrix adhesion must be dialled to an optimum level. The electrolytic surface treatment of carbon fibres during their production is one of the possible means of adapting the surface characteristics of the fibres. The production of a range of tailored fibres with varying surface treatments (adjusting the current, potential, and conductivity) was followed by contact angle, inverse gas chromatography and X-ray photoelectron spectroscopy measurements, which revealed a significant increase in polarity and hydroxyl, carboxyl, and nitrile groups on the fibre surface. Accordingly, an increase in the fibre-matrix interaction indicated by a higher interfacial shear strength was observed with the single fibre pull-out force-displacement curves. The statistical analysis identified the correlation between the process settings, fibre surface characteristics, and the performance of the fibres during single fibre pull-out testing.

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