Abstract

Nowadays, aluminum alloy is widely used in spatial structures, and aluminum alloy gusset joint is also the most widely used connection method in spatial structure. With the improvement of the requirements of architectural design effect, aluminum alloy structure is becoming one of the forms of special-shaped space. Combined with the shape structure of curved reticulated shell, its gusset plate is usually made of arc plate formed by stamping. However, due to its low elastic modulus, poor plastic deformation ability at room temperature and uneven distribution of stress and strain, the metal sheet begins to spring back after the stamping load is unloaded. At present, the main spring back control methods for aluminum alloy plate are laser peen forming, cold stamping forming and multipoint forming. There are three kinds of spring back prediction methods for sheet metal forming: analytical method, finite element method and experimental method. Spring back is one of the most prominent and complicated problems during the processing and formation of the aluminum alloy sheet. The final shape of the curved panel is also dependent on the spring back after formation. When the spring back exceeds the allowable error, it will directly affect the appearance of the component, and therefore, the overall assembly. Ultimately, the bearing performance will further affect the safety protocols involved in respective components.

Keywords: Aluminum alloy sheet; Spatial structures; Curved reticulated shell; Stamping forming; Spring back