scholarly journals Residual Stresses Introduced to Composite Structures due to the Cure Regime: Effect of Environment Temperature and Moisture

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
N. Chowdhury ◽  
J. Wang ◽  
W. K. Chiu ◽  
W. Yan
Keyword(s):  
Composite Materials ◽  
Residual Stresses ◽  
Composite Structures ◽  
Reinforced Polymer ◽  
Environment Temperature ◽  
The Matrix ◽  
Fibre Reinforced Polymer ◽  
Residual Strains ◽  
Cure Temperature ◽  
Curing Regime

Material behaviour of structural components is very important to understand. In fibre reinforced polymer composite materials, this is more difficult in comparison to isotropic materials as they are made up of two constituents: the fibre and the matrix. For aerospace composite materials, the matrix is usually an epoxy resin that cures at a high temperature. This curing regime is known to introduce residual stresses to the composite material as it cools from the high cure temperature. However, how to consider these residual stresses in a structural analysis is still widely debated. In this paper, the authors investigated the offset of thermal residual strains introduced by the cure regime by the swelling of the composite when exposed to moisture.

scholarly journals Method for the Microstructural Characterisation of Unidirectional Composite Tapes

2021 ◽  
Vol 5 (10) ◽  
pp. 275
Author(s):  
Nico Katuin ◽  
Daniël M. J. Peeters ◽  
Clemens A. Dransfeld
Keyword(s):  
Voronoi Tessellation ◽  
Unidirectional Composite ◽  
Fibre Volume ◽  
Cross Sectional ◽  
Reinforced Polymer ◽  
Novel Approach ◽  
The Matrix ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Microstructural Characterisation

The outstanding properties of carbon fibre-reinforced polymer composites are affected by the development of its microstructure during processing. This work presents a novel approach to identify microstructural features both along the tape thickness and through the thickness. Voronoi tessellation-based evaluation of the fibre volume content on cross-sectional micrographs, with consideration of the matrix boundary, is performed. The method is shown to be robust and is suitable to be automated. It has the potential to discriminate specific microstructural features and to relate them to processing behaviour removing the need for manufacturing trials.

Tribological behaviour of fibre-reinforced thermoset polymer composites: A review

2020 ◽  
Vol 234 (11) ◽  
pp. 1439-1449
Author(s):  
Santosh Kumar ◽  
KK Singh
Keyword(s):  
Composite Materials ◽  
Polymer Composites ◽  
Matrix Material ◽  
Research Work ◽  
Weight Ratio ◽  
Tribological Behaviour ◽  
Glass Fibres ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Thermoset Polymer

Application of fibre-reinforced polymer composites has increased over the last two decades as compared to conventional materials. This improvement in the application of fibre-reinforced polymer composites is attributed to their unique material properties, such as high strength and stiffness-to-weight ratio, specific modulus and internal vibration damping. However, in most of the industrial applications, composite materials encounter tribological complications. Economic indicators and market dynamics suggested that the market for composite materials is booming and the dominant materials are carbon fibres, glass fibres and thermoset polymer (polyester resin) in resin segments. That is why tribological characteristics are crucial in designing carbon and glass-based fibre-reinforced polymer components. Owing to this importance, the study of tribological behaviour of fibre-reinforced polymer composite materials has expanded significantly. The present study has made an attempt to review the fundamental tribological applications and critical aspects of fibre-reinforced polymers, based on research work, which has been carried out over the past couple of decades. This work has primarily focused on the fibre-reinforced polymer composites, based on carbon and glass fibres with thermosets as the matrix material for probing into tribological behaviours. In the process, the focus has largely been on the most commonly occurring erosive and abrasive mode of wear process.

Fibre Reinforced Polymer Rebar

2015 ◽  
Vol 1124 ◽  
pp. 89-96
Author(s):  
Jan Prokeš
Keyword(s):  
Heat Transfer ◽  
Composite Materials ◽  
Concrete Cover ◽  
Fire Tests ◽  
Corrosion Attack ◽  
Advanced Composite ◽  
Reinforced Polymer ◽  
Advanced Composite Materials ◽  
Fibre Reinforced Polymer

The paper is focused on the use of advanced composite materials in the real application areas of buildings exposed to extreme environmental stress. The paper describe properties of composite rebar, especially with regards to long-term resistance to chemical and corrosion attack, minimization of heat transfer or resistance in construction with reduced concrete cover. The paper also presents behavior of composite rebar and concrete samples with composite reinforcement during loading and fire tests.

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 Strength Characteristics of Concrete Specimen Wrapped with Glass Fiber Reinforced Polymer

2020 ◽  
Vol 8 (5) ◽  
pp. 358-362
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Glass Fibre ◽  
Fiber Reinforced Polymer ◽  
Glass Fiber Reinforced Polymer ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Glass Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Glass Fibre Reinforced

Glass Fiber Reinforced Polymer (GFRP) is one of a relatively new class of composite material. These materials are manufactured from a combination of fibers and resins. These composite materials have proven to be efficient and economical for the development of new structures and the repair of deteriorating structures in civil engineering. One of the important reasons for the use of GFRP composite materials is because of its superior mechanical properties. These mechanical properties includes impact resistance, strength, stiffness, flexibility and also its enhanced ability to carry loads. In construction industry, in order to meet the advanced infrastructure requirements, new innovative technologies and materials are being introduced. Also any new technology or material has its own limitations but to meet the new requirements, new technologies and materials have to be invented and put to use. With structures becoming old and increasing bar corrosion, old buildings have to be retrofitted with additional materials to increase their durability and life. For strengthening and retrofitting of concrete structures confinement with FRP has various applications. In this project concrete specimens are wrapped with glass fibre reinforced polymers to study the effect of confinement in the strength of specimens. For wrapping bi-directional and uni-directional glass fibre reinforced polymer mats are used. During the uni-directional glass fibre reinforced polymer wrapping, it is wrapped in both horizontal and vertical directions. The fiber used in this paper is bi-directional fibre. To find the effect of wrapping, specimens are wrapped in one rotation and two rotations.

Practicalities and Developments of High-Rise Composite Structures: Case Studies

2018 ◽  
Vol 940 ◽  
pp. 153-159
Author(s):  
Koorosh Gharehbaghi ◽  
Farshid Rahmani
Keyword(s):  
Composite Materials ◽  
Composite Structures ◽  
Construction Projects ◽  
Field Studies ◽  
Fiber Reinforced Polymer ◽  
High Rise ◽  
Reinforced Polymer ◽  
The Individual ◽  
High Winds ◽  
Engineering Projects

This paper will discuss the utilization of composite materials in construction projects and also provides the number of field studies to support the ever-increasing utilization of composite structures in Building and Construction projects. Composite materials are those manufactured from two or more constituents generally with different physical and/or chemical arrangement. Such process, thus produces a material with characteristics dissimilar from the individual components. Moreover, these individual components remain separate and distinct within the finished material’s internal structure. The purpose of this mechanism is to produce materials, which are stronger, lighter, or less expensive when compared to traditional materials. In the construction and engineering projects the composite materials typically include, Concrete, Fiber-reinforced polymer and Geo-polymer among others. Such composite materials are generally employed for buildings, bridges, and other structures such as walls, floors, and platforms. Nevertheless, all of these materials need to be able to handle various demanding environments such as high winds and seismic conditions which are common dilemmas for high-rise structures.

scholarly journals Progress in interlaminar toughening of aerospace polymer composites using particles and non-woven veils

2021 ◽  
pp. 1-27
Author(s):  
O. İnal ◽  
K.B. Katnam ◽  
P. Potluri ◽  
C. Soutis
Keyword(s):  
Fracture Resistance ◽  
Composite Structures ◽  
Published Data ◽  
Interlaminar Fracture ◽  
Layered Architecture ◽  
Frp Composites ◽  
Third Phase ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Damage Tolerant

Abstract Fibre-reinforced polymer (FRP) composites generally have a layered architecture and are commonly manufactured with thermosetting resins—making them susceptible to interlaminar fracture (i.e. delamination), which is often a major concern in structurally critical applications. As a result, various approaches have been explored to enhance interlaminar fracture resistance. This review focuses on third-phase toughener inclusions, which offer opportunities to create damage resistant and damage tolerant structures without significantly adding weight or reducing in-plane mechanical properties. These toughener inclusions, typically introduced in the interlaminar regions, are divided into two categories herein: particle fillers and non-woven fibre veils. The advantages and limitations of both types are discussed, and the potential of the two approaches is evaluated using published data, aiming to provide an overview of the current understanding and challenges in designing and manufacturing safe and reliable composite structures.

Energy Intensity and Quality of Recyclate in Composite Recycling

2015 ◽  
Author(s):  
Norshah A. Shuaib ◽  
Paul T. Mativenga
Keyword(s):  
Composite Materials ◽  
Energy Intensity ◽  
Mechanical Performance ◽  
High Demand ◽  
Chemical Methods ◽  
Reinforced Polymer ◽  
Carbon Fibre Reinforced Polymer ◽  
Cfrp Composite ◽  
Fibre Reinforced Polymer

Composite materials are widely used in various sectors such as aerospace, wind energy and automotive. The high demand especially for thermoset based glass (GFRP) and carbon fibre reinforced polymer (CFRP) composite materials has led to a rise in volumes of manufacturing scrap and end-of-life products as composite waste. Unlike thermoplastic polymers, thermoset polymers have difficulties in recycling due to their cross-linked nature. In this paper, thermoset composite recycling processes which are grouped into mechanical, thermal and chemical methods are assessed from the perspectives of energy consumption, processing rate and mechanical performance of the recycled products. The paper presents a benchmark of composite technologies as well as identifies research challenges.

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