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Process simulation of LPM (Liquid Polymer Moulding) in special consideration of fluid velocity and viscosity characteristics

 
: Repsch, Matthias; Huber, Ulrich; Maier, Martin; Rief, Stefan; Kehrwald, Dirk; Steiner, Konrad

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Fulltext urn:nbn:de:0011-n-4704646 (712 KByte PDF)
MD5 Fingerprint: a66342c8a12b31188b6dba89e0b9d7da
Created on: 27.2.2018


Advani, S.G. ; University of Delaware:
Flow Processes in Composite Materials : 7th International Conference on Flow Processes in Composite Materials, FPCM 2004, University of Delaware, Newark, United States of America, 7-9 July 2004
Delaware, 2004
pp.305-309
International Conference on Flow Processes in Composite Materials (FPCM) <7, 2004, Delaware>
English
Conference Paper, Electronic Publication
Fraunhofer ITWM ()

Abstract
Recently in RTM process technique in-situ polymerizing thermoplastics are a promising alternative for conventional thermoset matrix systems. The advantages of these systems are a low initial viscosity at the beginning of the process combined with the polymerization proceeding during injection. The low initial viscosity allows a fast mold filling even at a high fiber volume fraction which leads to a high fluid velocity especially at the beginning of the process. Additionally, the polymerization during injection leads to a change not only of the viscosity level but also of the viscosity characteristic to a shear rate dependent behavior. The high flow velocity as well as the shear dependent viscosity do not allow to model this kind of process by the generally accepted Darcy’s Law which assumes low flow velocity and newtonian viscosity of the fluid. The intention of this paper is to investigate a high velocity fluid flow in a non-crimp fiber bed as well as the influence of visco-elastic fluid characteristic on the fiber bed microstructure.

: http://publica.fraunhofer.de/documents/N-470464.html