Author(s): CC Emekwisia, CN Nwambu, OE Alade, CI Nwoye and OK Opetuki

Abstract: The operational confidence in determining the tensile strength of glass fibre-SiC reinforced based on yield strength and yield strain has been evaluated. The glass fibre-SiC reinforced polyester was produced using the hand lay-up technique. The involving computational analysis was facilitated using a derived model δ= Ьγ + βeϏΣ + N, whose validity was based on the core model structure; δ-Ьγ≈ βeϏΣ + N, in that both sides of the structure are correspondingly almost equal. The range of tensile strength, yield strength and yield strain used for the model development are 0.62-0.98(GPa), 20.2 – 71.2(MPa) and 1.16-2.9(%) respectively. Results generated from the experiment show very significant similarities with derived and regression model prediction, regarding corresponding point values. In accordance with experimental results, the model-predicted results indicate a direct relationship between tensile strength of the composite and yield strength & yield strain. The model functionality and confidence level was assessed and established through analysis of results generated from the correlations and model results deviations from those of the experiment. The correlations between the tensile strength and yield strength & yield strain are 0.9961, 0.9885 and 0.9865 & 0.9984, 0.9925 and 0.9983, using model-predicted, experimental and regression model-predicted results respectively. The maximum discrepancy between the model-predicted and experimental results, evaluated as deviation is 3.07%. It is therefore instructive to state that the overall model confidence level places between 96 -100%, considering the highlighted evaluations. Tensile strength of glass fibre-SiC reinforced polyester per unit yield strength and yield strain were computed as 7.07, 7.06 & 6.78 and 206.8966, 206.6526 & 198.4763 Mpa(%)-1 using experimental, derived model and regression model-predicted results respectively. Based on the foregoing, the derived model will predict the tensile strength of glass fibre-SiC reinforced polyester, within the experimental results range, on substituting into the model, values of the yield strength and yield strain, providing the boundary conditions is considered.

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