Effect of resin properties and processing parameters on crash energy absorbing composite structures made by RTM

The effects of resin properties and resin processing parameters on the crush behaviour of thermoset composite tubes manufactured using resin transfer moulding are considered. The aims were to quantify the performance of tubes produced over a broad spectrum of conditions and to correlate this performance to the properties of the material. The effects of the mould temperature, post-cure time and resin composition were investigated for random and engineered reinforcement fabrics. Relationships between Young's moduli and ultimate stresses of the material in tension and compression were established from plaques moulded under similar conditions. Random reinforcement fabrics gave higher specific energy absorption (SEA) levels than engineered fabrics, but were more sensitive to processing conditions. Epoxy absorbed more energy than vinyl ester. Vinyl ester absorbed more than polyester, and additions of vinyl ester resin to unsaturated polyester gave a linear increase in SEA. The ultimate compressive strength of the composite proved the best indicator of performance for the selected materials and processing conditions. (C) 2003 Elsevier Science Ltd. All rights reserved.