OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 3 2024 Ta b l e 4 Load Applying on Mould S.No. Load (KN) Time (min) Temp (°C) 1 50 01 170 2 100 02 170 3 150 12 170 Specimen 3: Jute + Treated Sida cordifolia fibers + PLA; Specimen 4: Jute + Treated Sida cordifolia fibers + PLA. Table 5 shows the weight composition of the composite layers. Ta b l e 5 Weight Composition of the Composite layers Layers Weight (grams) Specimen-1 Specimen-2 Specimen-3 Specimen-4 Layer – 1 80 80 80 80 Layer – 2 23.5 23.125 23.125 22.375 Layer – 3 23.5 23.125 23.125 22.375 Layer – 4 0 12 12 15 Layer – 5 23.5 23.125 23.125 22.375 Layer – 6 23.5 23.125 23.125 22.375 Layer – 7 80 80 80 80 Total Weight 254 264.5 264.5 264.5 Results and Discussion Tensile test Tensile testing was performed on 4 specimens and 3 samples of each specimen. The following tables describe at what peak load in kg the fracture occurred and the tensile strength in MPa calculated accordingly. Table 6 shows the average tensile strength of the composite specimens made of Sida cordifolia reinforced with jute fiber. The biodegradable polymer polylactic acid (PLA) was used as the matrix. Flexural test The three-point bending test was performed with 4 specimens and 3 samples of each specimen. Table 6 describes the bending point at which the peak point load occurred in kg and the bending strength in MPa calculated accordingly. The ultimate bending strength was calculated using the formula below. Ta b l e 6 Mechanical Strengths of tensile and flexural Specimen no Tensile strength (MPa) Flexural strength (MPa) 1 27.029 3.326 2 25.084 3.290 3 32.297 4.226 4 43.658 6.650
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