Abstract:Rotational molding process is an attractive plastic molding technology. As the key transmission and brace component, the fatigue life of roller has great influence on equipment performance. To forecast fatigue life of roller, rollertyre nonlinear contact model with finite element method (FEM) was established in ANSYS APDL based on classical Hertz contact theory to obtain the stress distribution rule. Combining with virtual load spectrum acquired by dynamics simulation in ADAMS software, fatigue life prediction was conducted by the collaborative simulation technology to provide dangerous weak area. The effect of transition fillet radium of weak area on fatigue life of roller was analyzed. The results show that the weak area locates at the transitional segments between spoke and flange. With the increasing of radium, fatigue life is improved observably. The fatigue life is reduced when the radium is over a certain critical value.