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Thermal comfort property is closely related to the concept of thermal insulation and includes protection against heat. This research paper presents an experimental study on thermal insulation properties, for natural fiber composite materials: a natural fiber (Coir/Jute) with different blend proportions of raw materials mixed with rigid polyurethane...
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Polymer matrix composites synthesized with biodegradable natural fiber obtain a predominant structure with specific properties at a low-processing cost. The unique characteristics of polymer matrix composites were magnetized in automotive parts like top roof, panel, and seat frame applications. American Society for Testing and Materials (ASTM) G99...
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In the present research work, three combinations of composite samples, jute and nettle fibers reinforced with polylactic acid (PLA) composites, and their hybrids (jute/PLA, Nettle/PLA, and jute/nettle/PLA) were fabricated using compression molding process. Present work aimed at the experimental investigation of fatigue, creep, dynamic mechanical be...
Composite is a combination of materials consisting of 2 or more materials lead to the composite material has different mechanical properties and characteristics as desired. Composite materials are divided into two types, synthetic fibers and natural fibers. Most of the natural fiber types use jute fiber, as it is a candidate as a reinforce material...
The efficient use of fibers derived from natural sources is the main goal of this research project. However, the priority on natural fibers falls short of meeting the necessary strength requirements. The goal of this work is to empirically analyze composite materials made with sugarcane bagasse and jute natural fibers as reinforcement, and PVA as t...
The use of composite materials with natural fiber reinforcement (CMNFR) has experienced rapid development in the automotive industry to apply synthetic materials that are expensive and not environmentally friendly. Biocomposite is a composite consisting of a polymer matrix and natural fiber reinforcement. Natural fiber materials are used as a subst...
Citations
... Life Cycle Assessment studies indicate that natural materials emit significantly less CO 2 than conventional absorbing materials such as minerals and glass wools (Boominathan S. Senthil Kumar et al. 2022). Natural fiber composites exhibit various desirable characteristics, including durability, affordability, biodegradability, lightweight, good mechanical properties, non-abrasiveness, high specific strength, and eco-friendliness (Mohankumar et al. 2022). Waste cotton fibers have been proven to be massive reinforcements in the matrix and additionally pigeon pea is used as natural fiber. ...
This study investigates the synthesis and characterization of composite materials, pigeon pea stem, and cotton fibers blended in different ratios such as 100/0, 70/30, 60/40, 50/50, 30/70, and 0/100. These composite materials were produced using a compression molding technique. According to ASTM standards, the acoustics, thermal conductivity, and physical characteristics of the composite samples were tested to assess their qualities. The impedance tube method detailed in ASTM E1050 was used to determine the sound absorption coefficients (SAC) for acoustics. The SAC values were measured at six frequencies such as 125, 250, 500, 1000, 2000, and 4000 Hz. The results showed that composite samples made from waste cotton and pigeon pea demonstrated sound absorption values of greater than 80%. Superior sound insulation and absorption, moisture absorption, fiber properties have also been demonstrated by waste composites. Especially, the waste cotton/pea stalk waste fiber composites achieved over 75% sound absorption, while the waste 28% composites performed well in terms of sound absorption, moisture absorption, and fiber properties. Even in humid conditions, the composite samples constructed from used cotton and pigeon pea stalks demonstrated good moisture resistance without reducing their insulating qualities. Soundproofing barriers are composite layers of foam or pigeon pea/cotton.
... Utilizing thermosets, thermoplastic and elastomeric matrix materials, these fibers are reinforced. 1 Plant fibers have historically been used as renewable resources because of their variety of characteristics. [2][3][4] With a global production of over 1.7 billion tons in 2011, sugarcane, scientifically referred to by the genus Saccharum spp., is a significant crop in tropical areas. After the cane stalks are crushed in sugar and alcohol mills, bagasse, a residue material that makes up around 30% of this cane, is left behind. ...
The efficient use of fibers derived from natural sources is the main goal of this research project. However, the priority on natural fibers falls short of meeting the necessary strength requirements. The goal of this work is to empirically analyze composite materials made with sugarcane bagasse and jute natural fibers as reinforcement, and PVA as the matrix. The goal is to examine the various mechanical and thermal insulating properties of Bagasse fiber/jute fiber composites to determine their application in technical domains. To carry out this investigation, a series of five hybrid composites were developed, each containing 65% polyvinyl acetate and varying the blend proportion of bagasse fiber and jute fiber: 100% /0%, 70%/30%, 50%/50%, 30%/70%, and 0%/100%. Compression molding was used as the fabrication technique. These composites’ resulting mechanical characteristics followed a critical analysis by ASTM standards. Through SEM analysis, the fiber shape, internal fracture forms, and binding properties were investigated. The results of the study showed that the tensile strength of composites made of bagasse and jute fibers is 265.80 MPa, which is close to the strength (270.10 MPa) displayed by composites made of synthetic fibers. Significantly, compared to the other configurations, the composites made up of 70% jute and 30% bagasse fibers exhibit a higher thermal insulation coefficient. Furthermore, compared to the other samples, these 70/30 composites had better impact resistance and flexural strength.
... The increase in crystallinity by alkali treatment might be the main contributing factor to the increase in fiber tensile properties [14,15]. The tensile properties such as maximum stress and percentage of elongation at break were determined using a Zwick/Roell Testing Machine at a crosshead speed (rate of traverse) of 30 mm/min maintaining a gauge length of 50 mm, pre-load 0.1 N. ...
Grewia fibers, derived from the bast of the Grewia plant, are one of the fascinating examples of naturally occurring composites found in various regions around the world. These fibers are comprised primarily of cellulose fibrils embedded within a lignin matrix, forming a unique and robust material. This article provides an overview of the main constituents of Grewia fibers and explores their structural and mechanical properties. Cellulose, the principal component of Grewia fibers, offers exceptional tensile strength and stiffness due to its long, chain-like polymer structure. Lignin, on the other hand, acts as a binding matrix, enhancing the overall durability and resistance to environmental factors. Hemicellulose, though in smaller proportions, contributes to the composite’s flexibility and adherence. The fibers were extracted from the external part of the plant and chemically treated with sodium hydroxide. To comprehend the character of molecular bonds, crystallinity and their correlations with various bonds in fiber structure FTIR technique were used. The surface morphology of fibers was examined through scanning electron microscopy (SEM). This article highlights the characterization of Grewia fibers to understand the unique combination of cellulose, lignin, and hemicellulose in Grewia fibers which may open the door to potential applications in various industries, such as textiles, construction, and bioengineering.
... Coir is a lignocellulosic fibre that has been characterized by several researchers (Ihueze, Achike and Okafor, 2016;Emeka et al., 2020;Madueke, 2021). Coconut fibre possesses desirable properties such as low thermal conductivity (Veeraprabahar et al., 2022) and hence they are applied in automotive thermal insulation. Coir has good acoustic properties (Muralidharan, 2022) as a result of its porosity, low density (Madueke, Umunakwe and Mbah, 2022) hence they are used in lightweight composites applications. ...
The study investigated the tensile properties of coconut fibre reinforced Polylactic acid biopolymer. Unidirectional arrays of coir fibres with an average diameter of 0.242 mm and a sample size of about 83 fibres per layer were used to manufacture PLA biodegradable composites by a film stacking technique via hot press. The type A composite was a blend of PLA/PLA/Coir/PLA/PLA while Type B composite was a blend of PLA/PLA/Coir/Coir/PLA/PLA. The manufactured composites were subjected to Instron universal testing machine to characterize their mechanical properties. The tensile strength for composites type A was found to be 11% higher than the tensile strength of composite Type B. However, the Young's modulus for composite type B was 20% higher than the Young's modulus for composite type A. Generally, the values of the tensile properties of the coconut fibre reinforced PLA composite was about 40% higher than the values found in literature for coir composites with matrices other than PLA within the studied range. Their microstructures were observed using scanning electron and optical microscopy, the microstructures of the composite samples show the arrangements of the coir fibres within the PLA matrix. Image analysis of the optical micrographs of the components on an 8-bit grey scale revealed volume fractions of fibres within the layers in Type A and Type B as 33% and 24% respectively. The images of the manufactured composites obtained from scanning electron microscope showed some level of fibre pull-out from the matrix..
... From Life Cycle Assessment (LCA), natural materials have been shown to produce much less CO 2 equivalent compared to commercial absorbing materials such as glass wools and minerals 1 the characteristics of natural fiber composites are durable, low-cost, low weight, high specific strength, non-Abrasive, equitably good mechanical properties, eco-friendly and biodegradable. 2 waste cotton natural fibers have proved to be an excellent reinforcement in polymers. The automotive and aerospace sectors represent the best opportunity for natural fibers due to their favorable characteristics such as lower weight, better crash absorbance, and sound insulation properties. ...
This study focuses on the development and characterization of pigeon pea stalk/cotton fibers mixed with a blend ratio of 50/50, 70/30, 30/70, 60/40, 100/0 waste cotton and 0/100 waste pea stalk composites are equipped with a compression molding system. The entire composite samples are tested for acoustics, thermal and physical parameters as per the American Society for Testing and Materials standard (ASTM). The sound absorption coefficients (SAC) were measured according to ASTME1050 by an impedance tube method, and the SAC over six frequencies 125, 250, 500, 1000, 2000, and 4000 Hz were calculated. The result revealed that the composite samples that are prepared from cotton/pigeon pea waste have confirmed more than 80% of the SAC and the waste composites provided the best insulation, sound absorption, moisture absorption, and fiber properties. The effect exposed that composites materials arranged from cotton/pea stalk waste fiber have established further than 75% by the sound immersion measure and the waste 28% composites handed the fashionable Appropriation, sound immersion, humidity immersion, and fiber materials. The waste cotton/pigeon pea stalk composite samples have satisfactory moisture resistance at high humidity situations without disturbing the insulation properties.
The influences of NaOH treatment and NaOH treatment conditions (NaOH concentration, treatment temperature and duration) on the mechanical properties of coir fibres were examined. The experiment was designed on a Minitab Software with a view to determining the optimal NaOH treatment conditions that would reveal the variable(s) that exerted the most significant influence on the tensile properties of the NaOH-treated coir fibres. NaOH treatment brought about increase in the tensile strength of coir fibres. The highest tensile strength and Young’s modulus were observed at the same treatment condition of; 20% NaOH concentration, 24 h duration and at 50 °C. Pareto Chart confirmed concentration as the parameter that exerted the highest influence on the material’s tensile properties. Observations from the microstructure showed that removal of tyloses was more as a result of treatment temperature and duration than NaOH concentration. The microstructure of the NaOH-treated coir fibres showed rough surfaces which can lead to improved adhesion between the fibres and the matrix during composites manufacture, thus improved mechanical properties of the composites.
Mechanical assembly requires joint mechanism involving fasteners and holes. Deformation of the holes will greatly affect the integrity of the mechanical joins. This research objective is to reveal the strain behavior of jute/polyester composite containing open hole under axial loading. It is very important to know the behavior of the strain surrounding the hole under loading. Experiments were carried out by preparing jute/polyester composites. The composites were manufactured by using a vacuum infusion method. There are two configurations of the number of laminations, i.e., 3 and 5 sheets and of hole sizes, i.e., 5 and 10mm holes. An axial load is applied to the specimen through a tensile test. Strain gauges are attached near the holes, axially and laterally. Strain in axial and lateral directions in the vicinity of a hole is recorded and presented. The research result shows that the strain gauges located parallel to the loading axis indicate a positivestrain value. On the other hand, the strain gauges located lateral to the loading axis indicate a negative value. Furthermore, the strain gauges located beside the hole in the direction parallel to the loading axis indicate the highest strain value in all types of specimens.
