Content area
Abstract
The objective o f this thesis is to study the Iiquid composite molding processes by injection-compression such as the compression resin transfer molding (CRTM) and the flexible bladder process. This work involves both theoretical and numerical aspects. Firstly, a theoretical study about the consolidation has been done by using the theory o f mechanics o f porous medium in order to set up the équations goveming in these processes. Then, mathematical models for CRTM process and flexible bladder process are derived from the équations o f the consolidation. The finite element method has been used to solve these équations. A numerical algorithm o f resolution allows the simulation o f these processes by a step-by-step procédure. A new modul o f calculation called compression has been developped in the object oriented laguage C++ and implemeted in the software LCMFLOT to realize numerical simulations o f the processes above mentioned. The important point in these processes in comparison to classical process such as RTM is the effect o f the compression. With the compression, the resin pressure is higher; the resin advance more easely and quickly; the final thickness in the product is more uniform; the quality o f the composite part is more homogeneous and its mechanical résistance is better. This software allows users to realize numerical simulations in chosing differentiy physical parameters in order to obtain a best set o f parameters for the process.