A numerical modeling is proposed for the simulation of flow, heat transfer, and reaction kinetics during the compression molding of three-dimensional thin parts. A nonisothermal, non-Newtonian model including the kinetic equation for a curing mechanism of thermosetting materials is implemented in a computer program, and a finite element method is used to simulate a preheating, a filling, and a post-heating stage during the entire compression molding process. As a more rigorous approach, a moving boundary condition due to the drag motion of an upper mold of a nonplanar shape or due to an apparent slip phenomena of particle filled materials is introduced into the present modeling, resulting in a new governing equation and the corresponding finite element formulation. Verifications of the analysis program were performed with a simple geometry for the Newtonian and non-Newtonian isothermal cases, in which the numerical results are found to be in good agreement with theoretical results. Effects of the moving boundary condition and processing conditions, such as thickness of compression molded parts, mold closing velocity and the preheating stage on overall compression molding processing, are numerically investigated. Numerical results for a car fender are also presented as an example of industrial applications.

1.
Barone
M. R.
, and
Caulk
D. A.
,
1979
, “
The Effect of Deformation and Thermoset Cure on Heat Conduction in a Chopped-Fiber Reinforced Polymer During Compression Molding
,”
Int. J. Heat Mass Transfer
, Vol.
22
, pp.
1021
1032
.
2.
Barone
M. R.
, and
Caulk
D. A.
,
1985
, “
Kinematics of Flow in Sheet Molding Compounds
,”
Polymer Composites
, Vol.
6
, pp.
105
109
.
3.
Barone
M. R.
, and
Caulk
D. A.
,
1986
, “
A Model for Flow of a Chopped Fiber Reinforced Polymer Compound in Compression Molding
,”
ASME Journal of Applied Mechanics
, Vol.
53
, pp.
361
371
.
4.
Barone
M. R.
, and
Osswald
T. A.
,
1988
, “
A Boundary Element Analysis of Flow in Sheet Molding Compound
,”
Polymer Composites
, Vol.
9
, pp.
158
164
.
5.
Bird, R. B., Armstrong, R. C., and Hassager, O., 1987, Dynamics of Polymeric Liquids, Vol. 1, Wiley, 2nd ed.
6.
Broyer
E.
, and
Macosko
C. W.
,
1976
, “
Heat Transfer and Curing in Polymer Reaction Molding
,”
AIChE J.
, Vol.
22
, pp.
268
276
.
7.
Castro
J. M.
, and
Macosko
C. W.
,
1980
, “
Kinetics and Rheology of Typical Polyurethane Reaction Injection Molding Systems
,”
Soc. Plast. Eng. Technical Papers
, Vol.
26
, p.
434
434
.
8.
Castro
J. M.
, and
Macosko
C. W.
,
1982
, “
Studies of Mold Filling and Curing in Reaction Injection Molding Process
,”
AIChE J.
, Vol.
28
, pp.
250
260
.
9.
Garcia
M. A.
,
Macosko
C. W.
,
Subbiah
S.
, and
Guceri
S. I.
,
1991
, “
Modeling of Reactive Filling in Complex Cavities
,”
Intern. Polymer Processing
, Vol.
6
, pp.
73
82
.
10.
Hatzikiriakos
S. G.
, and
Dealy
J. M.
,
1991
, “
Wall Slip of Molten High Density Polyethyelen. I. Sliding Plate Rheometer Studies
,”
J. Rheology
, Vol.
35
, pp.
497
523
.
11.
Hieber
C. A.
, and
Shen
S. F.
,
1980
, “
A Finite-Element/Finite-Difference Simulation of the Injection-Molding Filling Process
,”
J. NonNewt. Fluid Mech.
, Vol.
7
, pp.
1
32
.
12.
Isayev, A. I., 1987, Injection and Compression Molding Fundamentals, Macel Dekker, Inc.
13.
Kaylon
D. M.
,
Yaras
P.
,
Aral
B.
, and
Yilmazer
U.
,
1993
, “
Rheological Behavior of a Concentrated Suspension: A Solid Rocket Fuel Simulant
,”
J. Rheology
, Vol.
37
, pp.
35
53
.
14.
Kamal
M. R.
, and
Sourour
S.
,
1973
, “
Kinetics and Thermal Characterization of Thermoset Cure
,”
Polym. Eng. Sci.
, Vol.
13
, pp.
59
64
.
15.
Kamal
M. R.
, and
Ryan
M. E.
,
1980
, “
The Behavior of Thermosetting Compounds in Injection Molding Cavities
,”
Polym. Eng. Sci.
, Vol.
20
, pp.
859
867
.
16.
Kwon, T. H., and Kim, C. S., 1991, “Data Base of Viscosity Model of Various Thermoplastics,” Technical Report, Korea Institute of Science & Technology.
17.
Kwon, T. H., and Park, J. B., 1993, “Finite Element Analysis Modeling of Powder Injection Molding Filling Process Including Yield Stress and Slip Phenomena,” Polym. Eng. Sci, in press.
18.
Lee
C. C.
,
Folgar
F.
, and
Tucker
C. L.
,
1984
, “
Simulation of Compression Molding For Fiber-Reinforced Thermosetting Polymers
,”
Trans. ASME
, Vol.
106
, pp.
114
125
.
19.
Lee
L. J.
,
1981
, “
Curing of Compression Molded Sheet Molding Compound
,”
Polym. Eng. Sci.
, Vol.
21
, pp.
483
492
.
20.
Lee
S. S.
, and
Kim
S. C.
,
1991
, “
Analysis of Unsaturated Polyester-Polyurethane Interpenetrating Polymer Networks
,”
Polym. Eng. Sci.
, Vol.
31
, pp.
1182
1188
.
21.
Osswald
T. A.
, and
Tucker
C. L.
,
1988
, “
A Boundary Element Simulation of Compression Mold Filling
,”
Polym. Eng. Sci.
, Vol.
28
, pp.
413
420
.
22.
Osswald
T. A.
, and
Tucker
C. L.
,
1990
, “
Compression Mold Filling Simulation for Non-Planar Parts
,”
Int. Polym. Processing
, Vol.
5
, pp.
79
87
.
23.
Ryan, M. E., and Kamal, M. R., 1976, “Thermorheological Analysis of Thermosetting Resin and Molding Compounds,” Proc. 7th Int. Congress Rheology.
24.
Silva-Nietto
R. J.
,
Fisher
B. C.
, and
Birlcy
A. W.
,
1980
, “
Predicting Mold Flow for Unsaturated Polyester Resin Sheet Molding Compounds
,”
Polymer Composites
, Vol.
1
, pp.
14
23
.
25.
Stevenson
J. F.
,
1983–1984
, “
Molding Simulations for Thermally Initiated Exothermic Reactions
,”
Polym. Process Eng.
, Vol.
1
, pp.
203
222
.
26.
Tadmor
Z.
,
Broyer
E. C.
, and
Gutfinger
C.
,
1974
, “
Flow Analysis Network (FAN)—A Method for Solving Flow Problems in Polymer Processing
,”
Polym. Eng. Sci
, Vol.
14
, pp.
660
665
.
27.
Tucker
C. L.
, and
Folgar
F.
,
1983
, “
A Model of Compression Mold Filling
,”
Polym. Eng. Sci.
, Vol.
23
, pp.
69
73
.
28.
Wang
V. W.
,
Hieber
C. A.
, and
Wang
K. K.
,
1986
, “
Dynamic Simulation and Graphics for the Injection Molding of Three-Dimensional Thin Parts
,”
J. Polym. Eng.
, Vol.
7
, pp.
21
45
.
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