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Resin transfer moulding (RTM) and structural reaction injection moulding (SRIM), are liquid composite moulding processes, whereby a resin is transferred into a mould cavity containing a pre-positioned reinforcement preform. The cost and the weight of the product may be reduced by placing a foam inside the preform. During the process, the fluid pressure can result in shifting of the core, which causes manufacturing defects such as skin thickness variation, affecting the mechanical properties of the skin. The factors causing this shifting are identified in this study. The influence of fluid pressure and mould temperature on skin thickness ratio is examined experimentally and compared with the output from a simple model.

Skin Thickness Variation during Resin Transfer moulding of Sandwich Structures