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| Numerical simulation of flow-induced stress in injection molding |
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| DOI：10.7511/jslx20085129 |
| KeyWord:injection molding,viscoelastic,flow,undetermined coefficient method,'up-wind' method |
| TIAN Zhong CAO Wei SHEN Chang-yu |
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| Abstract: |
| The governing equations are in terms of compressible,non-isothermal fluid,and the conservative equations are based on the PTT(Phan-Thien-Tanner) model.By introducing some assumptions according to the characteristics of injection molding and applying parts integration,a quasi-Poisson type equation about pressure is derived.Besides,an analytical form of stress is also generalized by employing Undermined Coefficient Method.After the pressure is discreted and calculated by Galerkin approach,the velocity and stress are determined by the analytical formula.The 'upwind' difference scheme is employed to discrete the energy equation.Coupling is achieved by Relax Iteration Method between velocity and stress.The flow in the test mold is investigated by comparing the numerical results and photoelastic photos for polycarbonate.The good agreement indicates this method is valid for computing viscoelastic flow. |
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