OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 25 No. 3 2023 Ta b l e 2 Tensile test behavior of woven jute composite Number of layers Pattern & time with NaOH Concentration Tensile strength, MPa Tensile modulus, GPa 4 Basket (30 minutes, 1%) 48 ± 0.61 1.90 ± 0.11 Basket (1 hour, 1%) 49 ± 0.60 1.90 ± 0.10 Basket (30 minutes, 4%) 48.8 ± 2.61 1.91 ± 0.18 Basket (1 hour, 4%) 50 ± 1.17 1.94 ± 0.23 Number of layers Pattern & time without NaOH Concentration Tensile strength, MPa Tensile modulus, GPa 4 Basket 43.60±2.3 1.15±0.27 Tensile Test Tensile test has been performed using universal tensile machine for different percentage of NaOH and for different time has been taken for surface treatment. The results are shown in Table 2. As can be seen from the table above, tensile strength and tensile modulus increase about 12 % and 40 % over the stokes value, respectively. It can be concluded that the influence of the soaking time during the treatment of the surface of the fibers with a NaOH solution does not lead to a significant improvement of the tension characteristics of the composite material; the increase in the tensile strength is so minimal that it can be overlooked. Similar results were obtained with an increase in the NaOH strength. It indicates that when NaOH is applied, lignin and hemicellulose are swiftly removed from fibers. It can be clearly seen that – the highest value of tensile strength for basket-weaved CM is 50 ± 1.17 MPa when treated with 4 % alkali solution for 1 hour, and its tensile modulus is 1.94 ± 0.23 GPa; – the second largest value of tensile strength for basket-weaved CM is 49 ± 0.60 MPa with treatment with 1 % alkali solution for 1 hour, and its tensile modulus is 1.90 ± 0.10 GPa; – the lowest value of tensile strength for basket-weaved CM is 48 ± 0.61 upon treatment with 1 % alkali solution for 30 minutes, and its tensile modulus is 1.90 ± 0.11 GPa; – the second and last lowest tensile strength for basket-weaved CM is 48 ± 0.61 MPa when treated with 4 % alkali solution for 30 minutes, and its tensile modulus is 1.91 ± 0.18 GPa. Flexural Test Flexural test has been performed for the study of flexural strength and flexural modulus as shown in Table 3. According to the results of the aforementioned tests, it is clear that surface treatment of composite materials enhances its ability to bend. The greatest value of flexural strength and flexural modulus was Ta b l e 3 Flexural test behavior of woven jute composite Number of layers Pattern & time with NaOH Concentration Flexural strength, MPa Flexural modulus, GPa 4 Basket (30 minutes, 1 %) 70.6 ± 0.20 2.6 ± 0.11 Basket (1 hour, 1 %) 71.7 ± 0.60 3.2 ± 0.10 Basket (30 minutes, 4 %) 70 ± 0.60 2.8 ± 0.18 Basket (1 hour, 4 %) 95 ± 1.17 3.99 ± 0.23 Number of layers Pattern & time with NaOH Concentration Flexural strength, MPa Flexural modulus, GPa 4 Basket 69.44 ± 0.60 2.38 ± 0.11
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