An automobile side door opening and closing durability strength analysis method based on finite elements

The invention discloses a finite element-based automobile side door opening and closing durability strength analysis method, which comprises the following steps of: (1) extracting the middle surfacesof parts such as a side door outer plate, an inner plate, a window frame, an inner plate reinforcing plate, an outer plate reinforcing plate and an anti-collision beam, setting the thickness, and performing finite element mesh division on the parts; (2)adopting integral model connection treatment: adopting REB3-HEXA-REB 3 cell simulation for spot welding, entity cell simulation for hinges,bolt joints are connected through BOLT. The rotating shaft is simulated by a HINGE unit; damping expansion glue between the side door outer plate and the outer plate reinforcing plate and between the side door outer plate and the anti-collision beam is achieved through Adherty. The invention discloses an automobile door fatigue strength analysis method. The fatigue strength of a metal plate and the fatigue of a welding spot are c