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Numerical Modeling of Vacuum Assisted Resin Transfer Moulding

Zeinalpour, Mehdi | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39394 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Mazaheri, Karim; Taheri, Bahram
  7. Abstract:
  8. Here, we have simulated isothermal vacuum assisted resin transfer moulding (VARTM) using a control volume/finite element scheme. Two dimensional and dimensional (shell geometries) spatial discretization is used. Resin motion through fibers is enforced by vacuum negative pressure in downstream. The governing equations are mass conservation and well known Darcy equation. Using an unstructured triangular grid, complex geometries could be modelled. Application of a quasi-steady algorithm results in a system of linear equation for pressure distribution. This system must be solved in each time step. The point successive over-relaxation (PSOR) scheme is used to solve the system of linear equation. The results of previous time step is used as initial guess for pressure distribution in new time step. Since our initial guess is close to solution, the iterative PSOR method is shown to be extremely efficient in convergence time compared to conventional schemes. Two different finite volume and control volume/finite element schemes for analysis of pressure field are used and compared, and CV/FE is found to be more accurate and much faster in convergence. For validation, results are compared with analytical solution for some simple problems. To evaluate robustness and capabilities of this algorithm, a few real problems are solved. The overall filling time error in all applications is less than one percent. A new algorithm is presented for simulation of dry spots beget. This algorithm is now used to assess different strategies in moulding processes and to fined the optimum method
  9. Keywords:
  10. Numerical Modeling ; Finite Element Method ; Control Volume ; Composite Shells ; Vacuum Asisted Resin Transfer Molding (VARTM) ; Point Succesive Over Relaxatron Method (PSOR)

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