OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 25 No. 3 2023 When jute fibers are used to strengthen the matrix (fig. 7a), fracture occurs at an angle, which indicates an increase in the plasticity of the composite. Fig. 7b, 7d also show that the matrix failed first, and then the fibers, which indicates that the fibers in the composite had to withstand the highest loads. The matrix also served as a binder for the jute fibers. M. Rajesh et al [1, 3, 4, 5] and Savendra Pratap Singh [2] worked on composite materials from woven jute fiber and noted its improved properties. However, they investigated CM based on 1, 2 and 3 layers of woven jute fiber in various combinations. In this research work, the author considered a composite material based on four layers of woven jute fiber. The author performed a preliminary surface treatment of the fibers and revealed its positive effect on the properties, which opens up prospects for further structural use of such a composite material and replacement of CM based on synthetic fibers, which will reduce the level of environmental pollution by synthetic waste. Conclusions According to the study, the natural fiber composite has excellent mechanical and free vibration properties, making it suitable for use in low to medium loading conditions. The mechanical and free vibration characteristics of jute fibers increase significantly after surface treatment with NaOH, but the qualities are not significantly improved by increasing the NaOH strength or soaking time. The hydrophilic character of composite is shown by FTIR analysis, which prevents its use in a humid environment. SEM analysis shows that as the amount of fiber increases, the composite material changes from brittle to ductile. The conclusion of the study of the free vibration and mechanical behaviour of treated woven jute polymer composite would depend on the specific finding and result obtained from the research. however, here are some possible conclusions that could be drawn from such study. Improvement of mechanical properties. treating a woven jute polymer composite can result in improved mechanical properties compared to an untreated one. The treatment process may include methods such as chemical modification, surface treatment or the addition of a reinforcing agent. These processing methods can improve the strength and stiffness of the composite material, as well as the resistance to deformation. Improvement of vibration absorption. Free vibration analysis helps to evaluate the dynamic behavior of materials and structures. Treated woven jute polymer composites can exhibit improved vibration absorption characteristics compared to untreated composites. The treating process can change the interface of the fiber matrix, which will lead to improved energy dissipation during vibrations and an increase in damping capacity. References 1. Rajesh M., Singh S.P., Pitchaimani J. Mechanical behavior of woven natural fiber fabric composites: Effect of weaving architecture, intra-ply hybridization and stacking sequence of fabrics. Journal of Industrial Textiles, 2018, vol. 47 (5), pp. 938–959. DOI: 10.1177/1528083716679157. 2. Singh S.P. FTIR spectroscopy & mechanical behaviour study on jute fiber polymer composite. Journal of Advanced Engineering Research, 2019, vol. 6 (1), pp. 34–38. 3. Rajesh M., Jayakrishna K., Sultan M.T.H., Manikandan M., Mugeshkannan V., Shah A.U.M., Safri S.N.A. The hydroscopic effect on dynamic and thermal properties of woven jute, banana, and intra-ply hybrid natural fiber composites. Journal of Materials Research and Technology, 2020, vol. 9 (5), pp. 10305–10315. DOI: 10.1016/j. jmrt.2020.07.033. 4. Rajesh M., Pitchaimani J. Experimental investigation on buckling and free vibration behavior of woven natural fiber fabric composite under axial compression. Composite Structures, 2016, vol. 163, pp. 302–311. DOI: 10.1016/j. compstruct.2016.12.046. 5. Rajesh M., Pitchaimani J. Mechanical properties of natural fiber braided yarn woven composite: comparison with conventional yarn woven composite. Journal of Bionic Engineering, 2017, vol. 14, pp. 141–150. DOI: 10.1016/ S1672-6529(16)60385-2. 6. Mejri M., Toubal L., Cuillière J.C., François V. Fatigue life and residual strength of a short- natural-fiberreinforced plastic vs Nylon. Composites. Part B: Engineering, 2017, vol. 110, pp. 429–441. DOI: 10.1016/j. compositesb.2016.11.036.
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