DEVIATION FROM DARCYS LAW DURING THE （期间偏离达西定律）.pdfVIP

The 10th International Conference on Flow Processes in Composite Materials (FPCM10) Monte Verit脿, Ascona, CH 鈥 July 11-15, 2010 DEVIATION FROM DARCYS LAW DURING THE POST-FILLING STAGE OF RESIN INFUSION Quentin Govignon 1, Jamie Timms 1, Simon Bickerton 1, and Piaras A. Kelly 2 1 Department of Mechanical Engineering and Center for Advanced Composite Materials, The University of Auckland, Private Bag 92019, Auckland 1020, New Zealand 2 Department of Engineering Science and Center for Advanced Composite Materials, The University of Auckland, Private Bag 92019, Auckland 1020, New Zealand ABSTRACT : To allow for a better control of the quality of parts produced through the resin infusion process, it is necessary to understand the phenomenon happening during the post-filling stage of the process. This paper investigates the causes of the residual pressure gradient that can be observed at the end of the post-filling stage of the resin infusion and RTMLight processes. A modified formulation of Darcy鈥檚 law is presented along with experimental evidence in an attempt to verify and quantify the existence of a threshold pressure gradient in the case of flow through porous media. KEYWORDS: Darcy鈥檚 Law, Threshold pressure gradient, Resin Infusion, RTMLight INTRODUCTION The resin infusion process is increasingly being used in the boat building and wind turbine industries to manufacture large components in one shot. Compared to traditional wet hand lay-up, this process provides potential for higher quality in the final product as well as increased repeatability, better control of the toxic volatile organic compounds, and also increased productivity. Using resin infusion it is possible to manufacture a complex shaped sandwich structure at once, and the abs