Abstract: The linear isothermo-viscoelastic constitutive equation is
established according to the principle of viscoelastic
mechanics. Given the boundary conditions of the temperature
field, the linear thermo-viscoelastic costitutive equation is
established according to the analysis of the thermorheologically
simple. The stress analysis model is constructed on the base of
some reasonable hypotheses which consider the restraint
conditions of mold and the characteristics of injection molding
in the post-filling stage. The mathematical model is calculated
by the finite difference method. The results can help to predict
the warpage of plastic products.
Key words: Injection
molding Stress analysis Thermo-viscoelastic Laplace transform
Manuscript received on
November 18, 1998; revised manuscript March 14, 1999
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