3D Numerical Simulation Research on the Effect of Gate Location on Fiber Orientation and Injection-Molded Parts Deformation

Based on generalized non-Newtonian fluid with seven parameters Cross-WLF viscosity model and modified 2-domain Tait model, the injection process of short glass fiber-reinforced polypropylene is simulated with a true 3D model. The effects of gate location on clamp force, fiber orientation and parts deformation are investigated. The results show that: (1) Clamp force of the 3rd scheme that gate location is set on the center of long-side is the largest and that of the 1st scheme that gate location is set on the center of top is the smallest. (2)Because of shear stress, in the direction of thickness, the distributions of fiber orientation are layered orderly, namely, the degree of fiber orientation in core layer is the lowest, but that in subsurface layer is the highest. While perpendicular to the shear flow, the layering distribution isn’t obvious. (3) Compared the three schemes in respect of clamp force and parts deflection, the 3rd scheme is the poorest, which should not be adopted as can as possible, while the 1st scheme and 2nd scheme are reasonable.