ISSN 1556-6757










Volume 3, Issue 1, 2013


Energy Absorption and Mechanical Behaviour of Glass Fibre-Reinforced Polyester (GRP) for Automotive Components Design

Christopher Chukwutoo Ihueze and Alfred Nwabunwanne Enetanya

Energy absorption and mechanical behaviour of GRP were studied by using the compressive tests results of GRP to establish some critical parameters that may be required to design GRP components in automobile structures. Third and first order polynomial functions were fitted to the experimental tests results of GRP to establish functional models that were analysed with finite difference and Newton divided difference methods. The finite difference method captured the general trend of experimental tests results giving value of compressive limit as 23.78MPa at strain of 0.018 and elastic limit of 12.01MPa at strain of 0.01. The first order polynomial fit gave compressive or buckling modulus as 1.10GPa, toughness evaluated as the area under the stress strain curve as 308.52KPa. The Gauss-Legendre ‘two point rule’ was also used to evaluate the area under the stress-strain curve as a measure of the amount of energy absorbed per unit volume of material. Also the energy absorbed at the ultimate strength was estimated to be of the range 0.025J/m3 to 0.22 J/m3, while energy at fracture was estimated to be of the range 0.62 J/m3 to 1.62 J/m3 and the absorbed specific work was estimated as 0.001J/kg. The basic mechanical parameters needed for automotive components design were determined by this study. Full Article