scholarly journals Quasi-Isotropic and Pseudo-Ductile Highly Aligned Discontinuous Fibre Composites Manufactured with the HiPerDiF (High Performance Discontinuous Fibre) Technology

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1794 ◽  
Author(s):  
M. L. Longana ◽  
H. Yu ◽  
J. Lee ◽  
T. R. Pozegic ◽  
S. Huntley ◽  
...  
Keyword(s):  
High Performance ◽  
High Volume ◽  
Tensile Behaviour ◽  
Reinforced Composites ◽  
Specific Strength ◽  
Fibre Composites ◽  
Different Types ◽  
Recycled Composites ◽  
First Time ◽  
Fibre Reinforced Composites

Conventional composite materials reinforced with continuous fibres display high specific strength but have a number of drawbacks including: the elastic-brittle behaviour, difficulties in producing defect-free components of complex shape with high-volume automated manufacturing processes, and inherent lack of recyclability. Highly aligned, discontinuous fibre-reinforced composites (ADFRCs) are truly beneficial for mass production applications, with the potential to offer better formability and comparable mechanical properties with continuous fibre-reinforced composites. In previous publications, the High Performance Discontinuous Fibre (HiPerDiF) technology has been shown to offer the possibility to intimately hybridise different types of fibres, to achieve pseudo-ductile tensile behaviour, and remanufacture reclaimed fibres into high-performance recycled composites. However, to date, the work has been conducted with unidirectional (UD) laminates, which is of limited interest in engineering applications with mechanical stresses acting across many directions; this paper reports, for the first time, the mechanical behaviour of quasi-isotropic (QI) ADFRCs. When compared with randomly-oriented discontinuous fibre composites (RODFRCs), QI ADFRCs offer enhanced stiffness (+26%) and strength (+77%) with higher consistency, i.e., a reduction of the coefficient of variance from the 25% of RODFRCs to the 6% of ADFRCs. Furthermore, hybrid QI ADFRCs retain the pseudo-ductility tensile behaviour previously observed in unidirectional (UD) lay-up.

scholarly journals The Optimisation of Flax Fibre Yarns for the Development of High-Performance Natural Fibre Composites

2003 ◽  
Vol 12 (6) ◽  
pp. 096369350301200 ◽  
Author(s):  
S. Goutianos ◽  
T. Peijs
Keyword(s):  
High Performance ◽  
Fibre Composite ◽  
Natural Fibre ◽  
Reinforced Composites ◽  
Flax Fibres ◽  
Composite Systems ◽  
Fibre Composites ◽  
Structural Applications ◽  
High Level ◽  
Fibre Reinforced Composites

Currently most developments in the area of natural fibre reinforced composites have focused on random discontinuous fibre composite systems. The development of continuous fibre reinforced composites is, however, essential for manufacturing materials, which can be used in load-bearing/structural applications. The main problem in this case is the optimisation of the yarn to be used to manufacture the textile reinforcement. Low twisted yarns display a very low strength when tested dry in air and therefore they can not be used in processes such as pultrusion or textile manufacturing routes. On the other hand, by increasing the level of twist, a degradation of the mechanical properties is observed in impregnated yarns (e.g. unidirectional composites) similar to off-axis composites. Additionally, a high level of twist decreases the permeability of the yarns. This problem is addressed in the current work using yarns based on both long and short flax fibres.

New process technology for high volume production of composites

2011 ◽  
Vol 31 (1) ◽  
Author(s):  
Walter Michaeli ◽  
Jan Wessels ◽  
Marco Pöhler ◽  
Lionel Winkelmann
Keyword(s):  
High Performance ◽  
High Volume ◽  
Fibre Volume ◽  
Reinforced Composites ◽  
Process Technology ◽  
Compression Moulding ◽  
New Process ◽  
High Volume Production ◽  
Volume Production ◽  
Fibre Reinforced Composites

Abstract Despite their outstanding properties, the use of composites is still limited. The absence of an appropriate and economic high volume production technology is the most important restriction for the use of composites. This paper presents results of the research on new high volume production chains for continuous fibre reinforced composites which are based on the separation and parallelisation of the process steps “impregnation” and “forming and curing”. Two new impregnation processes for polyurethane and epoxy resin as well as a new compression moulding technology are introduced. The production of high performance parts with a fibre volume content higher than 50% in a cycle time below 10 min is described and analyses of the impregnation quality and the mechanical properties of the parts are presented.

The significance of damage and defects and their detection in composite materials: A review

1992 ◽  
Vol 27 (1) ◽  
pp. 29-42 ◽  
Author(s):  
W J Cantwell ◽  
J Morton
Keyword(s):  
Composite Materials ◽  
Damage Detection ◽  
Failure Modes ◽  
Fracture Mechanisms ◽  
Reinforced Composites ◽  
Load Bearing ◽  
Fibre Composites ◽  
Non Destructive ◽  
Fibre Reinforced Composites ◽  
Non Destructive Techniques

In this paper the various failure modes which occur in long fibre composites are described and discussed. The significance of each of these fracture mechanisms, in terms of their energy-dissipating capacity as well as their effect on the residual load-bearing properties, is considered. A brief review of both the destructive and non-destructive techniques used for detecting and characterizing defects and damage is presented. The ability of each technique to identify the various fracture mechanisms involved in the failure of long fibre reinforced composites is discussed and their overall suitability for damage detection evaluated.

Review on effect machining parameters on performance of natural fibre–reinforced composites (NFRCs)

2018 ◽  
Vol 32 (9) ◽  
pp. 1282-1302 ◽  
Author(s):  
T Rajmohan ◽  
R Vinayagamoorthy ◽  
K Mohan
Keyword(s):  
Natural Fibre ◽  
Machining Parameters ◽  
Reinforced Composites ◽  
Optimum Conditions ◽  
Limit Setting ◽  
Fibre Composites ◽  
Wide Range ◽  
Unconventional Machining ◽  
Fibre Reinforced Composites ◽  
Mixed Nature

In the modern years, natural fibre composites have been converted into significant materials in many industries such as automotive, aerospace and and so on. Several types of natural fibre composites, particularly plant-based fibre composites, have been developed and tested. However, their mixed nature, engineer’s requirement of experience, an understanding of machinability databases, limit setting and trouble in manufacturing are barriers to extensive use of composites. The final shape of the natural fibre–reinforced composites (NFRCs) are obtained by conventional and unconventional machining. Machining of these composites generates confront due to the heterogeneous and anisotropic nature. Different methodologies and tools are intended to overcome the machining defects. In this article, a wide range of literature review on machining of NFRCs is examined with focus on conventional and unconventional machining operation. This article also discusses the influences of machining parameters and optimum conditions for machining of NFRCs.

Sustainable composites: Processing of coir fibres and application in hybrid-fibre composites

2019 ◽  
Vol 54 (15) ◽  
pp. 1947-1960 ◽  
Author(s):  
Lucas Ciccarelli ◽  
Frederik Cloppenburg ◽  
Sangeetha Ramaswamy ◽  
Stepan V Lomov ◽  
Aart Van Vuure ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polylactic Acid ◽  
High Performance ◽  
Industrial Applications ◽  
Coir Fibre ◽  
Hybrid Fibre ◽  
Fibre Composites ◽  
Composite Product ◽  
Composites Processing ◽  
Fibre Reinforced Composites

Coir fibres, a byproduct of the coconut industry, have high performance qualities but are difficult to process by conventional textile methods. The purpose of the research is to combine the processibility of hemp and flax with the high-performance properties of coir to create a composite product worthy of industrial applications. The evaluation of coir fibre-reinforced composites focuses on the processibility of the coir fibre into a nonwoven, how well it interfaces with polylactic acid and an analysis of how the mechanical properties of the final product change when mixing coir with hemp and flax. The results show that the hybrid samples outperformed most of the researched values for coir composites, despite the reduced properties of control samples as in comparable research. Adding just 10% of either flax or hemp dramatically increased the mechanical properties compared to the pure coir–polylactic acid composite.

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.

scholarly journals Self-Sensing Fibre Reinforced Composites

2004 ◽  
Vol 13 (2) ◽  
pp. 096369350401300 ◽  
Author(s):  
Gerard F Fernando ◽  
Balkarransingh Degamber ◽  
Liwei Wang ◽  
Crispin Doyle ◽  
Guillaume Kister ◽  
...  
Keyword(s):  
Chemical Process ◽  
Fibre Bundle ◽  
Reinforced Composites ◽  
Glass Fibre Reinforced ◽  
Glass Fibre Reinforced Composites ◽  
Chemical Process Monitoring ◽  
Light Guides ◽  
First Time ◽  
Fibre Reinforced Composites

This paper reports for the first time a demonstration of chemical process monitoring of conventional glass fibre reinforced composites where the reinforcing fibres themselves act as the optical fibre sensors. These fibres were used to study in real-time, the rate of chemical reaction between an epoxy resin and an amine hardener. These reinforcing fibre light guides were also subsequently used to study, in situ, the fracture sequence of the reinforcing fibres. This was achieved by imaging one end of the fibre bundle whilst illuminating the opposite end.

scholarly journals Rapid Identification of two Species of Peucedanum by High-Performance Liquid Chromatography-Diode Array Detection-Electrospray Ionization Tandem Mass Spectrometry

2009 ◽  
Vol 4 (8) ◽  
pp. 1934578X0900400 ◽  
Author(s):  
Yanyan Tao ◽  
Jianguang Luo ◽  
Yuanyuan Lu ◽  
Deran Xu ◽  
Zhiguo Hou ◽  
...  
Keyword(s):  
High Performance ◽  
Rapid Identification ◽  
Uv Spectra ◽  
Herbal Extracts ◽  
Linear Type ◽  
Esi Ms ◽  
Fragment Ions ◽  
Different Types ◽  
Array Detection ◽  
First Time

The fragmentation behaviors of the angular- and linear-type coumarins from Peucedanum praeruptorum Dunn and P. decursivum (Miq.) Maxim were simultaneously investigated by HPLC-DAD/ESI-MSn. For more structural identification, the fragment ions were analyzed and some possible fragmentation pathways were proposed. Different positions and numbers of the substituent also led to different fragment behaviors. Two types of coumarins from P. praeruptorum and P. decursivum were structurally elucidated by these techniques. In addition, UV spectra were applied to support the MS analysis. This is the first time that the two types of coumarins from herbal extracts have been differentiated by HPLC-DAD/ESI-MSn. The method further illustrated the importance of the ESI-MSn technique in the identification of different types of coumarins and was applied for the rapid differentiation of the two herbs.

Mechanical properties of natural fibre polymer composites

2017 ◽  
Vol 37 (9) ◽  
pp. 879-895 ◽  
Author(s):  
Agnivesh Kumar Sinha ◽  
Harendra K. Narang ◽  
Somnath Bhattacharya
Keyword(s):  
Mechanical Properties ◽  
Interfacial Adhesion ◽  
Review Paper ◽  
Natural Fibre ◽  
Reinforced Composites ◽  
The Past ◽  
Fibre Composites ◽  
To Come ◽  
Fibre Reinforced Composites ◽  
Made In

Abstract Extensive efforts have been made in the last decade for the development of natural fibre composites. This development paved the way for engineers and researchers to come up with natural fibre composites (NFCs) that exhibit better mechanical properties. The present review is based on the mechanical properties of jute, abaca, coconut, kenaf, sisal, and bamboo fibre-reinforced composites. Before selecting any NFC for a particular application, it becomes necessary to understand its compatibility for the same, which can be decided by knowing its mechanical properties such as tensile, flexural, and impact strengths. This review paper emphasises on the factors influencing the mechanical properties of NFCs like the type of matrix and fibre, interfacial adhesion, and compatibility between matrix and fibre. Efforts are also made to unveil the research gaps from the past literatures, as a result of which it is inferred that there is very limited work published in the field of vibration incorporating potential fillers such as red mud and fly ash with NFCs.

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