COMPOSITE RESPONSE COMPARATIVE ANALYSIS, MODELLING, VALIDATIONS, AND REGRESSORS EFFECTS ON RAMIE FIBRE REINFORCED POLYESTER MATERIAL STRENGTH PROPERTIES

George O. Okoronkwo, Kizito Chidozie Ibe, Simeon I. Bright

Abstract


The study is undertaken to find the composite response comparative analysis, modelling, validations, and regress-ors’ effects on ramie fibre reinforced polyester material strength properties. For this purpose ramie fibre of aspect ratio  as 16.67, 50.00 and 83.33 were used. Samples were casted by using nine different sample mixtures with 10 % 20 % and 30 % ramie fibres by volume of polyester. At the end of curing these casted samples were subjected to material strength tests like compressive strength, split tensile strength, flexural strength and ultrasonic pulse speed test. The control polyester composite materials compressive strength, split tensile strength, flexural strength and average ultrasonic pulse velocity are 44.0 MPa, 2.6 MPa, 4.6 MPa and 4531 m/s. The ramie fibre aspect ratios of 16.67, 50.00 and 83.33 possess compressive strength of 48.2 MPa, 54.81 MPa and 58.68 MPa, split tensile strength of 3.1 MPa, 3.89 MPa and 5.00 MPa, flexural strength of 5.6 MPa, 7.42 MPa and 9.05 MPa and average pulse velocity of 4700 m/s, 4875.25 m/s and 5870.65 m/s, respectively. Compressive strength improved by 9.55 to 33.36 %, split tensile strength enhancements of 19.23 to 92.31 %, flexural strength increased by 21.74 to 96.74 % and average ultrasonic pulse velocity improved by 3.73 to 29.57 %. Also, from strength properties models it is found that the ramie fibre polyester polymer composites has optimum compressive strength, split tensile strength, flexural strength and average ultrasonic pulse velocity of 58.03 MPa, 5.033 MPa, 9.237 MPa at 95 % adequacies and 5694 m/sec below 95 % adequacies with 66.66, 83.33, 76.66 and 83.33 optimum fibre aspect ratios and 32, 36, 36 and 50 optimum fibre volume fractions at 91.53 %, 99.39 %, 97.66 % and 81.93 % accuracies all at 1.8500, 0.0067, 0.0918 and 5.5369e+04 mean square errors. It was observed that ramie fibre along with polyester mixture has significantly improved these properties. Regression analysis on experimental results generated some statistical model predicting the results in good agreement.

KEYWORDS:  Composite response comparative analysis; Compressive strength; Flexural strength; Split tensile strength; Ultrasonic pulse velocity; Modelling; Validations; Regressors effects


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