Abstract: This paper established a model for injection of large automotive parts with which the fracture defect analysis could be carried out to locate the fracture. The optimization goal was to determine the residual stress in fracture location. By orthogonal experiments, CAE analysis, and data processing technique, various factors influencing residual stress in fracture location, and the optimal combination of process parameters were obtained.

Key words: injection molding, automotive front bumper bracket, differential scanning calorimetry, orthogonal experiment, residual stress