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Simulation of dynamic mold compression and resin flow for force-controlled compression resin transfer molding

  • Chih-Yuan Chang EMAIL logo
Published/Copyright: September 6, 2019
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Abstract

In the present study, an improved consolidation model, with mold inertia included, is proposed to completely predict how the upper mold rapidly moves from rest to maximal velocity and then decelerates to a steady value for a constant force-controlled compression resin transfer molding (CRTM). Simulation results show that all preform compaction cases cannot apply to quasi-static consolidation theory in CRTM. For cases with a massy mold, inadequate preform resistance, and low resin viscosity, the mold inertia has a short, remarkable influence on the resin counter-force and causes a slightly slow resin progression in the early compression stage. Contrarily, the compaction of the rigid preform is applicable to the quasi-static consolidation theory. Additionally, a reasonable time increment is discussed for using the quasi steady-state approximation.

Award Identifier / Grant number: MOST 106-2221-E-244-006

Funding statement: The author gratefully acknowledges the financial support of the Ministry of Science and Technology of Republic of China under Grant number: MOST 106-2221-E-244-006.

Nomenclature

DA

area density of fiber mat (kg/m2)

Df

density of the fiber filament (kg/m3)

Fcomp

compression force (N)

Ffiber

force exerted by preform (N)

Finertia

inertial force of mobile mold (N)

Fresin

force exerted by resin pressure (N)

h

preform thickness (m)

compression speed (m/s)

Kx, Ky

permeability of the preform in x and y directions (m2)

Lf

length of the saturated preform (m)

M

mass of mobile upper mold (kg)

N

number of fiber mats

nx, ny

directions of the outward unit normal to the element boundary

P

pressure (Pa)

Pinj

injection pressure (Pa)

u, v

velocity components in x, y direction (m/s)

uf

front velocity (m/s)

x, y

coordinate components in the physical domain (m)

Greek symbols
Δt

time increment (s)

ϕ

porosity of the preform

μ

resin viscosity (Pa-s)

σ

stress of compressed preform (N/m2)

Ψ

shape function

Γ

coordinate along the boundary

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Received: 2019-06-10
Accepted: 2019-08-13
Published Online: 2019-09-06
Published in Print: 2019-09-25

© 2019 Walter de Gruyter GmbH, Berlin/Boston

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