To study experimentally the shear tension strength of a carbon/S-glass/Eglass fiber reinforced epoxy polymer composite with 2 wt.% of silica nanoparticle filler. Composites were made using the hand lay-up method, and test specimens were prepared into two unique groups, namely the control group (Without filler) and the experimental group (With filler). The test samples per group are calculated using ClinCalc and found to be n = 20 samples. The G-power used for this process is 80%, α = 0.05 per set for calculating sample size, and the total sample size calculated is N = 40. The samples are prepared in accordance with the ASTM-D2344 standard. The shear tension strength of the samples in each group were determined using a custom build fixture in universal testing machine. The samples in the experimental group and control group were tested, and their shear tension strengths were determined and compared. The samples in the experimental group with silica nanoparticles as filler materials showed higher shear tension strength compared to those in the control group without silica nanoparticles. Using the statistical software SPSS (Statistical Package for the Social Sciences) v26 an independent sample t-test was performed on the obtained results and the significance was ensured by the obtained (2-tailed) p value of 0.001 (p < 0.05). Within the constraints of the study’s restrictions, the results demonstrate that the hybrid carbon/S-glass/E-glass fiber reinforced epoxy composite with 2 wt.% of silica nanoparticles had improved shear tension strength by 16.53% over the hybrid carbon/S-glass/E-glass fiber reinforced epoxy composites without silica nanoparticles.

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