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Summary: MODELING INJECTION MOLDING PROCESSES WITH
DEFORMABLE POROUS PREFORMS
D. AMBROSI AND L. PREZIOSI
SIAM J. APPL. MATH. c 2000 Society for Industrial and Applied Mathematics
Vol. 61, No. 1, pp. 2242
Abstract. This paper deduces a new model aimed at simulating injection molding processes
under isothermal conditions. These processes can be generally stated as infiltration problems in
initially dry porous materials. The spatial domain is then divided by the infiltration front into two
time-dependent subdomains, the dry and the wet porous preforms, both being allowed to deform
under the action of the liquid pressure. It is shown that the model calls for the definition of the
stress-deformation relationship of both the dry and the wet preforms, which are assumed to behave
elastically and inelastically, respectively. The coupled flow/deformation problem in the two regions
(separated by an interface) is formulated with the corresponding boundary conditions and with the
proper evolution equations determining the motion of the boundaries.
The mathematical problem is solved numerically, highlighting the importance of inertial terms
in the early stage of the infiltration and focusing on the influence of the mechanical properties of the
material and on the deformation of the preform during the infiltration process.
Key words. analytical modeling, injection molding, resin transfer molding (RTM), deformable
porous media
AMS subject classifications. 33H40, 35C01
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