Experimental Investigation on Creep Forming of A New Al-Li-Cu-Mg Alloy Plate

Abstract

Fundamental creep fonning experiments on a new Al-Li-Cu-Mg alloy plate were carried out to investigate the forming parameters of integral reinforced panel with thin skin. The effects of process parameters on springback ratio and material properties are investigated by orthogonal design method. The result data show that the springback ratio decreases with the temperature and tune period of creep age forming, increases with radius of pre-bend. The tension strength and yield strength increase and then decrease with temperature of creep forming. The elongation decreases with the temperature of creep forming. A mathematical equation model for springback ratio is proposed and resolved thorough regression analysis method. A typical structure of fuselage panel is creep formed, which verified the effectiveness and accuracy of the mathematical equation model.