Modelling of injection moulded polypropylene-grass composite
DD Olodu, JO Osarenmwinda
This study was carried out to develop empirical models for predicting the mechanical properties of injection moulded polypropylene-grass composite. The two screw plunger injection moulding machine with maximum clamping force of 70 tons and shot capacity of 3.0oz was used to produce Polypropylene-Grass composite at barrel temperature which ranged from 210oC to 310oC. The mechanical properties obtained from the experimental investigation of the produced polypropylene-grass composite were used to develop the empirical models for tensile strength, proof stress, percentage elongation and flexural strength respectively. The developed models were validated using coefficient of determination (R2) and mean absolute percentage error (MAPE). The coefficient of determination obtained ranged from 0.9213 (92.13%) to 0.9911 (99.11%) which indicates that a substantial good fit was achieved by the models developed. The mean absolute percentage error of the developed models ranged from 0.12% to 6.53% which was below 10% recommended. The values obtained from the validation of these models were therefore found to be satisfactory and shows good predictability of the models.