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Short Kevlar Fiber Reinforcement at the Interface for Repair of Concrete

Short Kevlar Fiber Reinforcement at the Interface for Repair of Concrete

Commercial concrete samples, tested under three-point-bending (3PB) test, are repaired with adhesive epoxy joint. Short Kevlar fiber is used together with the epoxy and hardener mixed resin to improve the fracture performance. Two different repairing methods are used, (a) with epoxy only, (b) with epoxy and short Kevlar fiber of 6 mm, and the experimental results of failure peak load are compared. The fracture energy is also measured. The short Kevlar fiber bridges the concrete fracture surfaces and epoxy joints, which requests a higher peak load or fracture energy. The interfacial fracture mechanism also alters because of the short Kevlar fiber. The fracture mechanisms of the concrete samples before and after repaired with the adhesive joint and Kevlar fiber are discussed.

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Physical and Mechanical Characteristics of Kevlar Fiber Reinforced PC/ABS Composites

Physical and Mechanical Characteristics of Kevlar Fiber Reinforced PC/ABS Composites

From the mechanical behaviors and the polarity of PC/ABS blend, it can be concluded that polarity of the Kevlar fiber (Solubility Parameter (δ) = 23) and the polycarbonate (Solubility Parameter (δ) = 21) trend to be closer to each other than that to of ABS [25]. Therefore, the Kevlar-reinforced composite with greater PC content in the matrix exhibits higher compatibility between the fiber and the matrix. This is the reason why the peel strength and the flexural properties of the composite increased with increasing the PC content in the matrix. The relationship between compatibility and the enhancement of mechanical properties in this study corresponds to those for other systems reported in the literatures [26-28].

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Fabrication and Characterization of Kevlar Fiber Reinforced Polypropylene Based Composite for Civil Applications

Fabrication and Characterization of Kevlar Fiber Reinforced Polypropylene Based Composite for Civil Applications

Abstract: Composite is one of the most widely used materials because of their adaptability to different situations. Composites have gained popularity in high performance products to take harsh loading conditions such as, tails, wings, propellers, scull hulls because of their low costs, ease in designing and production of functional parts etc. Selection of the materials for fabricating composites was made from the final nature of the component, the volume required, apart from cost effectiveness and mechanical strength. In this study, It was envisioned to develop Kevlar fiber reinforced polypropylene based composites for structural components and systems with better strength, serviceability, durability and cost effectiveness. Composites of Kevlar and polypropylene (PP) barring five total fiber percentages (5, 10, 20, 30 and 40% by weight) were prepared by compression molding technique. The molded composite specimens were characterized by physical, mechanical and thermal properties. The highest change in tensile strength (TS) and elastic modulus (EM) were 550% and 140% respectively comparative to the matrix materials and 40% fiber containing composites. The analysis results were supported by scanning electron microscope images. However, based on the SEM image of the fracture surface, it was found that the interfacial interaction between the matrix and fiber was moderate.

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Evaluation of Mechanical Properties of Jute and Kevlar Fiber Reinforced Materials

Evaluation of Mechanical Properties of Jute and Kevlar Fiber Reinforced Materials

In the above table.4 the tensile and flexural stresses are calculated for the specimens. In that the specimen K2J1 has the good tensile and flexural stresses when compare to the other two specimens. For K1J2 flexural stress is good but tensile stress is less and for K1J the tensile stress is slightly good but flexural stress is very poor. So for these specimens we can say that the use of jute fiber to the kevlar fiber will give the good tensile and also flexural properties i.e.K2J1.

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Experimental Study on the Structural Retrofitting of RC Beam Using Synthetic Steel Mesh Fiber and High Strength Aramid Kevlar Fiber Reinforced in Concrete Beam

Experimental Study on the Structural Retrofitting of RC Beam Using Synthetic Steel Mesh Fiber and High Strength Aramid Kevlar Fiber Reinforced in Concrete Beam

This study is mainly material collection of added the extra material used like synthetic steel mesh fiber (SSMF) used for concrete beams retrofitting or wrapping and aramid kevlar fiber (AKFR) in the way of small pieces of reinforced in concrete beams and cubes. Tested for physical properties as per Indian standard specification IS: 456:2000 method of tested for concrete and course aggregates.

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Evaluation of Tensile Strength of Carbon - Kevlar Fiber Reinforced Epoxy Hybrid Composites by Experimentation

Evaluation of Tensile Strength of Carbon - Kevlar Fiber Reinforced Epoxy Hybrid Composites by Experimentation

The varied high strength fibers are now being explored for high performance application in automotive and aerospace sectors in larger scale. Carbon and Kevlar fibers are classified as a high strength and toughness reinforcing materials and yield better mechanical properties. To escalate the benefits presented by the newly established composites constituting a Carbon/Kevlar as a reinforcing materials along with epoxy resin under Tensile and Compressive loading scenario, tests are conducted to investigate the influence of inter-ply hybridization on static properties and the results were reported. Wet layup with vacuum bagging approach was used for fabrication of laminated samples with a total of eight layers by varying the carbon/Kevlar layers sequence and orientation for obtaining of ten configured laminates. A volume fraction of fiber of 36 ± 2% is kept for all ten laminates. Results indicated that highest tensile strength provided by carbon reinforced epoxy composites. The Lowest tensile strength by hybrid sample having Kevlar fibers on the middle part sandwiched between carbon on the outer part with orientation of ±45 0 to second and seventh layer of Kevlar. Tensile strength of carbon reinforced epoxy composites is 2.23 times the value of Kevlar reinforced epoxy composite. The decrease of Kevlar weight fraction and the increase of carbon fiber content, results gave a higher tensile strength to the hybrid composites.

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Evaluation of Tensile Strength of Carbon - Kevlar Fiber Reinforced Epoxy Hybrid Composites by Experimentation

Evaluation of Tensile Strength of Carbon - Kevlar Fiber Reinforced Epoxy Hybrid Composites by Experimentation

The varied high strength fibers are now being explored for high performance application in automotive and aerospace sectors in larger scale. Carbon and Kevlar fibers are classified as a high strength and toughness reinforcing materials and yield better mechanical properties. To escalate the benefits presented by the newly established composites constituting a Carbon/Kevlar as a reinforcing materials along with epoxy resin under Tensile and Compressive loading scenario, tests are conducted to investigate the influence of inter-ply hybridization on static properties and the results were reported. Wet layup with vacuum bagging approach was used for fabrication of laminated samples with a total of eight layers by varying the carbon/Kevlar layers sequence and orientation for obtaining of ten configured laminates. A volume fraction of fiber of 36 ± 2% is kept for all ten laminates. Results indicated that highest tensile strength provided by carbon reinforced epoxy composites. The Lowest tensile strength by hybrid sample having Kevlar fibers on the middle part sandwiched between carbon on the outer part with orientation of ±45 0 to second and seventh layer of Kevlar. Tensile strength of carbon reinforced epoxy composites is 2.23 times the value of Kevlar reinforced epoxy composite. The decrease of Kevlar weight fraction and the increase of carbon fiber content, results gave a higher tensile strength to the hybrid composites.

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Investigation of Leaf Spring using Basalt and Kevlar Fiber with Isopolymer

Investigation of Leaf Spring using Basalt and Kevlar Fiber with Isopolymer

Now a day, Natural fibers are widely used as a composite material as a replacement for conventional & traditional fiber reinforced composite material such as carbon fibers, glass fibers, etc have excellent mechanical properties. But there are disadvantages in using these fibers such as non-eco friendly, toxic, etc. While comparing with natural fiber, the advantages of natural fiber are environmental friendly, fully biodegradable, cheap, light in weight, non toxic, no abrasion to machine & have low density. As like traditional fiber & conventional fiber the natural fiber also have good specific strength, high toughness, good thermal insulation & less respiratory irriation.

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Experimental Investigation of Composite Materials Subjected to Torsional Stresses at High Shear Strain Rate

Experimental Investigation of Composite Materials Subjected to Torsional Stresses at High Shear Strain Rate

The shear stress versus shear strain curves for woven kevlar fiber -epoxy composite samples at minimum and maximum angle of twist is shown in figure (9). It was appeared in the shape of the curves of shear strain -shear stress, the non- linearity increased when the shear strain increases. From this figure, at θ=12 ̊, the percentage incremental in shear strain and shear stress with respect to increase in volume fraction from 25% to 55% are 15.9% and 10.3%, respectively. Also, the incremental percentage in shear strain rate with respect to incremental in volume fraction from 25% to 55% is 14.4%. The reason for these increases is due to the increasing of the volume fraction which causes enhancement in the stiffness of samples.

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Flexural and Impact Behaviour of Kevlar/E Glass Reinforced Epoxy Matrix Composites

Flexural and Impact Behaviour of Kevlar/E Glass Reinforced Epoxy Matrix Composites

Kevlar fibers are widely used in defence, aerospace and marine industries due to its specific nature of higher energy absorption and impact load resistance. 80% of the body armor and vehicle armors in the military contains major contribution of Kevlar fiber. The polyamide aromatic structure of the kevlar possess ultimate endurance to the Kevlar configuration [10-14]. Alireza et al [15] analyzed the effect of filler reinforcement into the composites and stated that reinforcement of fillers enhances tensile strength and young's modulus of the composite products.

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STUDY AND FABRICATION OF BAMBOO-ARAMID HYBRID COMPOSITE MATERIAL Mr. Amar M*, Mr. Chikkadevegowda S.S

STUDY AND FABRICATION OF BAMBOO-ARAMID HYBRID COMPOSITE MATERIAL Mr. Amar M*, Mr. Chikkadevegowda S.S

The high modulus aramid organic fibers were first introduced commercially in the seventies by Du Pont. Initially referred to as Fiber B and PRD-49, these fibers are now produced and sold by Du Pont under the trade name Kevlar. These are synthetic organic fibers consisting of aromatic polyamides. The aramid fibers have excellent fatigue and creep resistance. Although there are several commercial grades of aramid fibers available, the three most common ones used in structural applications are Kevlar 29, Kevlar 49 and Kevlar 149. The normal for Kevlar fiber is its exceptional quality it is an extremely solid fiber has had its greatest effect in the ballistics barrier where it's utilized as a part of impenetrable vests. It is more grounded than fiberglass and five times more grounded than steel on a pound-for-pound correlation. It is particularly intended for use in regions where high-affect resistance is of essential significance, for example, airplane decelerators, security tackles, and where cut and cut resistance is wanted, for example, for ropes, links, and covered fabrics for inflatable's and building fabrics. Kevlar filaments are light weight, high quality and solidness, vibration damping, and imperviousness to harm, exhaustion, and anxiety burst are key properties

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Innovative composite materials application in the design of seats and interior parts

Innovative composite materials application in the design of seats and interior parts

Table 3-9: Results collection for thermoset with Std CF by Performance Composites The reaction force range varies from about 15 N for the flat panel up to 28,000 N for the corrugated structure. Only this kind of structure for this material is able to satisfy the force requirements above 8,000 N without exceeding the weight limit. The reason for that is due to the fact that the design has been developed considering as reference density the one of composites with carbon fibers since they are in between the ones of glass and Kevlar fiber composites. It is important to stress that the solution with corrugated panel and inner ribs is weaker than the one with just the corrugated panel since the material quantity has been removed from the panel in order to build the ribs. This means that the influence of the panel is much stronger than the one of the ribs. The values in Table 3-9 refer to the best solution; it can be noted that in all cases the higher values are obtained displacing the ply fibers at 45°/-45° with respect to the load direction; this is satisfied only for the structures with corrugated panel since for the panel and the panel with ribs the optimal values are achieved at 0°/90° orientation. These results are the same for the other materials even if some exceptions are observed and will be pointed out. Table 3-10 is related to the HMCF by Performance Composites.

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Biomechanical Properties of Hybrid Kevlar/Linen/Epoxy Composite For Bone Plate Applications

Biomechanical Properties of Hybrid Kevlar/Linen/Epoxy Composite For Bone Plate Applications

This work is part of an ongoing program to develop a new Kevlar fiber/linen/epoxy (KF/flax/ epoxy) hybrid composite material for use as an orthopaedic long bone fracture plate, instead of a metal plate. The purpose of this study was to evaluate the mechanical properties of this novel composite material. The composite material has a “sandwich structure”in which two thin sheets of KF/epoxy were attached to each outer surface of the linen/epoxy core, which resulted in a unique structure compared to other composite plates for bone plate applications. Mechanical properties were determined using tension, three- point bending, and Rockwell hardness tests

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Mechanical Properties of Kevlar/Jute Reinforced Epoxy Composite

Mechanical Properties of Kevlar/Jute Reinforced Epoxy Composite

Hybrid laminates of woven jute and Kevlar mat were prepared by compression moulding at temperature 114 0 C and pressure 20 Kg/cm 2 . PVA release agent was applied to the surfaces of the mold. Jute and Kevlar fabrics were pre- impregnated with the matrix material consisting of epoxy SE-70. The impregnated layers were placed one over the other in the mold (300 mm×250 mm) and pressed for 2h before removal. Provision was made in the mold to allow the hot gases to escape. Uniform thickness was achieved by using spacers of desired thickness between the moldplates. After 2h, the laminate was removed from the mold and cured

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Applications of SHEAR THINNING FLUID (STF) as NANOTECHNOLOGY on the KEVLAR Materials FOR BALLISTIC Protections

Applications of SHEAR THINNING FLUID (STF) as NANOTECHNOLOGY on the KEVLAR Materials FOR BALLISTIC Protections

The aim of the present study is to perform a ballistic characterization of composites by means of the fundamental machine parameters have high non-linearity theoretical behavior hereafter experimental preliminary results of a prototypal device are presented and results were discussed. An intriguing issue of nano- science research for aerospace applications is to produce a new thin, flexible, lightweight and inexpensive material that have an equivalent or even better ballistic properties than the existing Kevlar fabrics. The primary objective of body armor research is to develop a low cost, lightweight, wearable garment system with improved impact resistance. Currently used body armors, particularly those for military use, are considered too heavy, limiting the agility and mobility of the wearer and eventually leading to increased casualties. Body armor standards require that an impactor should be stopped under impact, and the penetration depth into a backing material to the armor should not exceed 1.73 inches. If penetration depth exceeds this value, a wearer can acquire serious blunt trauma1. Therefore, the demand for substantial improvement in the performance-to-weight ratio of body armor as well as the performance-to-thickness ratio is very high. The research results demonstrated that ballistic penetration resistance of Kevlar fabric is enhanced by impregnation of the fabric with a colloidal SHEAR THICKENING FLUID (STF). Impregnated STF/fabric composites are shown to provide superior ballistic protection as compared with simple stacks of neat fabric and STF.

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Permeability and Flammability Study of Composite Sandwich Structures for Cryogenic Applications

Permeability and Flammability Study of Composite Sandwich Structures for Cryogenic Applications

Burning time depends on sample size and is shorter for small samples. It is easier to compare burning time per unit mass, see Fig. 5.2.3 and 5.2.4 showing that uncoated papers and fabric, and Kapton film need more time to burn out. Addition of nanoparticles makes burning faster probably because there is less resin in the system, however addition of 6% of nanoclay gives longer burning time then 4% probably because such amount of clay starts to act as flame retardant material or separates masses of resin. Ignition time for uncoated papers and fabric, and Kapton film is much bigger when compared to all other samples, see Fig. 5.2.5. It is difficult to detect any influence of addition of nanoparticles on ignition time. Comparisons of total heat release (THR) and THR per unit mass show small values for uncoated papers, fabric, pure resins, and Kapton film. Summarizing of results for papers and resins alone in Fig. 5.2.9 does not give values for coated papers, which means that impregnated papers burn easier and faster. Addition of nanoclays reduced THR, especially for samples with 4 and 6% of both Bentolite and Nanocor with exception of epoxy film with 6% of Bentolite, see Fig. 5.2.10. Comparisons of heat release rate (HRR) and peak of HRR (PHRR) depict small values for papers, fabric, and Kapton, and big ones for pure polyester resin and Kevlar fabric coated with epoxy. Influence of addition of nanoparticles on PHRR values can be found in Fig. 5.2.14, where nanoclays Bentolite and Nanocor reduce the values with exception of epoxy film with 6% of Bentolite, while nanofibers Pyrograf increase them. Graphs of effective heat of combustion (EHC) and peak of EHC (PEHC) show that unmixed materials (papers, fabric, and resins separately) give smaller values with exception for PEHC value for pure epoxy, see Fig. 5.2.17. Influence of addition of nanoparticles on values of EHC and PEHC is difficult to be evaluated and discussed.

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Genetic Linkage Map and QTL Analysis of Agronomic and Fiber Quality Traits in an Intraspecific Population

Genetic Linkage Map and QTL Analysis of Agronomic and Fiber Quality Traits in an Intraspecific Population

useful in developing selection criteria to simultaneously improve yield and fiber quality traits. Qualitative trait loci explaining from small to moderately high proportions of phenotypic variance (3.4 to 44.6% of trait variation) were common in our study and support a model for quantitative inheritance for most agronomic and fiber quality traits (Landen and Thompson, 1990; Paterson et al., 1991). The majority of the RFLP alleles associated with long fiber span length, fineness, and strong fiber were contributed from Acala Prema, while most of the alleles associated with high yield and high lint percentage were contributed from the MD5678ne parent.

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EFFECT OF QUENCHING TEMPERATURES ON THE PROPERTIES AND PERFORMANCE OF KEVLAR SUPPORTED IPP MEMBRANES

EFFECT OF QUENCHING TEMPERATURES ON THE PROPERTIES AND PERFORMANCE OF KEVLAR SUPPORTED IPP MEMBRANES

Micro-porous IPP membranes were prepared on weave Kevlar fabric by TIPS techniques. During the fabrication, all parameters were kept constant except the variation of the quenching temperature. The structure of the fabricated membranes was investigated using SEM and AFM. The permeation of various solvents: water, methanol, ethanol and iso-propanol were tested using a custom made filtration cell. It is observed that with the increase in quenching temperatures, for the fabricated membranes, porosity has increased. Average Pore sizes are observed to be 0.925 µ, 2.850 µ and 3.250 µ, respectively for 20, 30 and 40C quenching temperatures. The flux characteristics of the prepared membranes were also tested for the prepared membranes at various pressures for different solvents in the filtration cell. The flux for the membranes prepared at higher quenching temperature found to be highest and thus support the mciro-porosity information obtained from SEM analysis. Furthermore, flux rate of water observed to be highest while iso-propanol was relatively lower for the membranes prepared at higher quenching temperature. This observation was explained in consideration of the smaller size of water molecules relative to other solvent molecules tested in the current work. It is also observe that with the increase in pressure, flux has also increased.

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Experimental Investigation on Mechanical Properties of Kevlar Fibre

Experimental Investigation on Mechanical Properties of Kevlar Fibre

The experimental investigation was carried out on various types of fibres to find the use of the fiber in the structural engineering in particular and civil engineering in general. Various testing procedures were adopted to find the effectiveness and compatibility of fibre in concrete. In this paper the study was conducted about engineering and mechanical properties of Kevlar Fibre and in comparison with other fibers, testing of Kevlar fibre under various conditions and the very systematic comparative study was been carried out on the properties of Kevlar with respect to other fibers. The main objective of the study is to find out the mechanical properties and compatibility of fibre so that it can be used in concrete to enhance its properties and to increase its durability.

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STUDY OF FLEXURAL BEHAVIOR OF RC BEAM USING CARBON FIBRE REINFORCED POLYMER LAMINATE

STUDY OF FLEXURAL BEHAVIOR OF RC BEAM USING CARBON FIBRE REINFORCED POLYMER LAMINATE

In 1958, Roger Bacon created high-performance carbon fibers at the Union Carbide Parma Technical Center, now Graf Tech International Holdings, Inc. located outside of Cleveland, Ohio. Those fibers were manufactured by heating strands of rayon until they carbonized. This process proved to be inefficient, as the resulting fibers contained only about 20% carbon and had low strength and stiffness properties. In the early 1960s, a process was developed by Dr. Akio Shindo at Agency of Industrial Science and Technology of Japan, using polyacrylonitrile (PAN) as a raw material. This had produced a carbon fiber that contained about 55% carbon. The high potential strength of carbon fiber was realized in 1963 in a process developed by W. Watt, L.N. Phillips, and W. Johnson at the Royal Aircraft Establishment at Farnborough, Hampshire. The process was patented by the UK Ministry of Defense then licensed by the National Research Development Corporation (NRDC) to three British companies: Rolls-Royce, already making carbon fiber, Morganite and Courtaulds.

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