Abstract
Flow of stampable thermoplastic sheet developed by Toray was simulated with moving particle semi-implicit method. The method was improved by introducing implicit method into velocity calculation, simplifying pressure calculation, applying parallel computing and parameterizing walls. These improvements made the present method about 80 times faster than basic MPS method. And the quaternion was introduced to calculate rotation of fiber assumed to be rigid in three dimensions. Then, compression molding of circular plate and rib was simulated with this improved MPS method. In circular plate case, computational result showed a similar tendency to experiment that the random orientation of fibers was kept through compression. And in rib case, computational results also showed a similar tendency to experiments that sheet was driven into rib keeping ply order, and that resin rich was formed depending on fiber length. The traditional computational methods such as finite element method and finite difference method are not good at these analyses of fiber orientation and resin rich (heterogeneity), and it is confirmed that the particle method is useful for these analyses.
