Springback Characteristics of Arched Aluminum Alloy Gusset Plate in Stamping Forming

Abstract:

Gusset joint is one of the most common joint systems used in single-layer aluminum alloy reticulated shells. In order to meet the modeling requirements of curved shell surface， arched gusset plates formed by stamping are usually adopted. The springback phenomenon is the main defect in the forming process of arched gusset plate， and the accurate prediction of the springback value is the key to ensuring the machining accuracy. In this paper， the stamping forming process of the arched gusset plate was simulated by using the ABAQUS/Explicit & Standard， and the finite element model was validated by the comparison of its springback value with the date of a practical gusset plate. Subsequently， a parametric analysis was conducted to investigate the effects of the material property， the value of stamping camber， the thickness and radius of the gusset plate， as well as the arrangement and total area of the bolt holes on the springback value. Finally， the calculation equation to estimate the springback value was proposed by theoretical deviation， and the coefficients of the equation were obtained by regression analysis. The good agreement between the calculation results and the numerical analysis results indicated that the proposed formula was with sufficient accuracy.

Key words:aluminum alloy gusset joint;arc-shaped plate;stamping forming;spring-back;fitting equation