Experimental Investigation of Design Rules for Resin Gating and Venting Using the Vacuum Injection Technique

Abstract

Various resin gating methods commonly used for the Resin Transfer Moulding (RTM) method of composite manufacture are discussed, with their associated advantages and disadvantages. Peripheral gating combined with vacuum impregnation was identified from previous studies as being particularly beneficial in achieving complete wet-out and fast injection times. Reported design rules for gating and venting arrangements are also discussed. This investigation has attempted to assess the capabilities of peripheral gating, initially for simple geometrical shapes which then increased in complexity. Existing design guidelines were confirmed and new concepts proposed. RTM processing of the final shape to be considered was finally assessed by comparison of peripheral with rectilinear gating. This process also identified the importance of component design for manufacture and the benefits of peripheral gating. It is hoped that this experimental investigation will not only be useful to RTM mould designers but also to those involved in resin flow modelling of such processes for composite components