Abstract: The creep behavior of carbon fiber reinforced resin matrix composites under extreme environmental and long-term service conditions can change the shape of structural components, posing a challenge to their performance stability. Therefore, the study of the creep performance of this material is the key to material design and application. The creep behavior of injection molded carbon fiber reinforced polypropylene composites was studied and the theoretical equations of the Burgers model for this material were obtained through uniaxial tensile creep test. Moldex3D was used to simulate the orientation and distribution of carbon fibers inside the injection molded samples, and the simulation results were mapped to ABAQUS to perform finite element analysis on the creep process of a three-dimensional model of this material. It is shown that the fitting curves of the Burgers model are in good agreement with the experimental curves, and can be applied to predict the creep behavior of this material at a wider range of timeand stress levels; the results of mold flow analysis are consistent with the cross-sectional observations of the actual samples; the orientation and distribution of carbon fibers during injection molding can affect the creep behavior of the final formed samples. The combination of mold flow analysis and finite element analysis can better reflect the creep process of the material.

Key words: carbon fiber reinforced resin matrix composites, creep, finite element analysis, injection molding, recycled carbon fiber