Papers by Keyword: Matrix

Abstract: Rice straw and rice husk fibers (RS/RH) reinforced polymer-based composites have theability to conserve wood and petroleum resources. As natural filler, rice straw and rice husk offer asustainable material for the production of polymer-based composites. The application ofbiocomposite limits the burning of straw at the root and may further enhance the socioeconomicstatus of farmers and rural populations. This review mainly focuses on five different weightpercentage of reinforced RS and RH fiber content (5%, 10%, 15%, 20% and 25%) in polymercomposites. Nowadays, Epoxy, polyurethane, polyester, PVA, PLA and polyethylene are beingused as matrix material in polymer composites. This paper holds good with understanding themechanical properties, pretreatment methods and offer important insight into potential uses ofpolymer composites with biodegradable reinforce fiber.

Abstract: The current technological need is the use of eco-friendly and biodegradable composites. It seeks to increase the use of natural resources to engineer composite materials to be better than before. This study aims to analyze the effect of ramie fiber orientation for ramie composites (in this study 45⁰ and 0⁰) on tensile strength and impact strength and find the best orientation angle with higher power and impact value than the other fiber angles on ramie composite. The fiber used in this study was ramie fiber, and the matrix used was Yukalac 157 BQTN-EX polyester resin. This research method uses the experimental process of conducting experiments and testing. The results showed that the 0⁰ angle direction composite achieved the highest average tensile strength value of 54.3 N/mm², and the impact strength showed the highest average impact strength value of 0.0168 J/mm², performed by the 0⁰ composites.

Abstract: A methodology for analytical stability assessment of individual compressed flexible phases of discretely heterogeneous composite elements of engineering structures is proposed to ensure their reliable safe operation and minimise the consequences of emergencies. Based on the energy balance equation for the proportional forces of a normal resistance of the medium to the phase displacement, expressions are obtained for determining the critical force, taking into account the possible initial curvature (non-rectilinearity) of a single phase in the elastic medium of the matrix for three possible cases of stability loss. The approbation of the results of the study on the example of deformation features of reinforcing bars in a compressed reinforced concrete column is presented.

Abstract: Plastic bags are one of the most widely used packaging materials in industries. Lower production cost, lightweight and high strength envisage its use in food packaging, carrier, and transportation industries. However, these plastic bags are non-biodegradable and cause serious water and soil pollution. It is one of the most thrust areas of research to overcome this problem in the current world. In the present investigation, fabrication, and characterization of an environmentally friendly and biodegradable "jute fibre reinforced paper composite" and "reinforcement free paper laminate" subjected to drop test were done. The standard procedure of the "MIL-STD-810G 516.6" drop test was followed. The adhesion between the matrix (paper) and reinforcement (jute fibre) was produced by applying a chemical-free adhesive made of flour and water. There were four different types of samples: single paper (SP), reinforcement-free paper laminate (RFPL), single-layer jute fibre reinforced paper composite (SLJPC), and double-layer jute fibre reinforcement paper composite (DLJPC). The microstructural characterization of the fractured surface after the drop was done using a scanning electron microscope operated at a voltage of 20 kV. The DLJPC samples had the maximum density and envisage drop-strength of 7 times as compared to the SP samples having the lowest density. The drop-strength exhibited linear regression with density for all the samples. The microstructure of the as-received matrix showed a non-homogeneous distribution of fibres along with micro-voids which were susceptible sites for the fracture. Unlike as-received matrix fibres distribution, the reinforcement fibres were aligned in two mutually perpendicular directions which leads to its strengthening. Hence, it can be said that the non-uniform structural properties envisaged by the as-received matrix can be compensated by uniformly distributed structural properties of the as-received reinforcement when both come together as a composite. The primary fracture mechanism of SP samples exhibited fibre breaking along with a few fibres' delamination. However, in the case of the RFPL sample, the nature of adhesion applied was capable to hold both the interfaces and the primary fracture mechanism was fibre breaking. It is suggested that the adhesive applied transmitted load through the interfaces. Unlike SP sample, the RFPL sample exhibited some adhesive pull-off. The fractured surface of the SLJPC sample showed that the matrix did not subject to fracture, however, reinforcement did fracture hence the load was transferred from matrix to reinforcement followed by a rupture of the reinforcement. Therefore, the primary fracture mechanism for the SLJPC sample was reinforcement rupture. The DLJPC sample showed a delamination of matrix and reinforcement.

Abstract: The research in nanocomposites is accelerating with greater velocity due to its wide range of properties and applications in various sectors like construction, marine, automobile, aerospace, defense, and biomedical fields. Most of the researchers are trying to improve the properties further by dispersing various nanomaterials to the matrix to improve the matrix properties. In the present review article, we have discussed in brief the nanocomposites and their various synthesis routes along with their advantages and disadvantages. Why nanocomposites are more preferable over conventional composite materials is also discussed. Important characterization techniques like X-Ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier-transform infrared spectroscopy (FTIR), thermogravimetry (TG) and differential scanning calorimetry (DSC) used to investigate the nanocomposites are also discussed.

Abstract: The goal of this work is to use MATLABSimulink to create a simulation of a DC-to-DC boostconverter it, utilizing SPMC topology that is a matrixconverter with only one phase. With the outputboosted more than that the fluctuations are quiet high.In this project work, we have tried to boost up theoutput to five times after keeping the fluctuations aslow as possible. The output voltage is controlled usingthe PWM approach. IGBT is used in four pairs andtaken as the switching device. Four pairs of diodes arealso used with the IGBTs and are placed in parallel andopposite direction. The simulation was performed at aswitching frequency of 10 kHz, and the findings werein excellent agreement with the quadrant operation'sfirst quadrant, and it was able to increase the voltageof itsinput by about five times . In addition, an inverterissuccessfully created, demonstrating the use of matrixtopology.

Abstract: The article presents the results of research focused on the behavior of composites with a matrix based on alkali-activated materials when exposed to extreme temperatures (up to 1200°C). The behavior of the material based on alkali-activated fly ash, blast furnace slag, metakaolin, their mutual combinations respectively was analyzed in detail. The effect of thermal exposure on the properties of the developed materials was assessed by a complex of physical, mechanical and chemical methods. A specific area of research was the examination of the rheological properties of the developed mixtures in the fresh state.

Abstract: In this research study, the feasibility of renewable energy based green house was investigated for sustainable food production under arid climatic conditions. The novel hybrid biomass based matrix (Coco Date Palm Coir matrix), was synthesized from Oman’s date palm tree fibers and coconut coir. The characterization of the matrix was done in terms of bulk density (0.09 g/cc), particle density (0.23 g/cc), porosity (61%), moisture content (37.4%) and water holding capacity (65.6%). The hydroponic system based greenhouse employing evaporative cooling based climate control technique is used for the identification of novel plant growth matrix for the successful demonstration of plant growth. The experimental trials were conducted over the one-year period with dedicated cycles with average 7-8 weeks duration. The experiments conducted verified the growth of Lettuce over two cycles and the plant growth rate and wet biomass are recorded and compared. The growth of the plant attained at the end of week 5 was 175 mm and the maximum growth of 293 mm at the end of 58 days.

Abstract: This study aims to formulate and evaluate the meloxicam (MX) transdermal patches using deproteinized natural rubber latex (DNRL) as a polymer matrix due to its good film forming characteristics. Hydrophobic drug, MX was firstly dissolved in hydroalcoholic solution and incorporated into DNRL with various concentrations of the drug (1-5%w/w). These mixtures were then cast on the glass plate prior to drying and thereafter obtaining the MX-loaded transdermal patches. Increasing amounts of the drug provided more opaque films with more precipitation of drug in films. The highest amount of MX was 3%w/w to incorporate with DNRL to obtain the acceptable patch without any visible precipitation. Compatibility of each ingredient in the formulation was confirmed using differential scanning calorimeter and X-ray diffractometer. The in vitro drug release study showed the increment of MX release from 7.88±0.43% to 13.33±0.87% in receptor medium of modified Franz diffusion cell when the drug concentration in the patches was increased from 1 to 3%w/w. The in vitro drug permeation study also found that MX could penetrate from DNRL transdermal patch through the porcine skin. However, these release and permeation amounts of MX were rather low that should be improved with some specific techniques and should be further investigated.

Abstract: Various types of deformed semi-finished products are prepared from aluminum alloys, such as plates, sheets, tapes, foil, panels, profiles, pipes, rods, forged pieces, wires. These semi-finished products are obtained by processing ingots of continuous casting by pressure - rolling, rolling-off, pressing, forging, stamping or drawing. Pressed semi-finished products are made of aluminum alloys in the majority of cases. The work examines the study of the evolution of the half-finished products microstructure at different stages of their manufacturing in several passes and shows the possibility of obtaining strips of fine-grained structure using pressing in a special device. Also, the research established that, in the material of half-finished product from the AD31 aluminum alloy the smooth fine-grained structure is formed with grains of 6 - 17 μm, which leads to an increase in the strength properties of the alloy and to a preservation of good plasticity.