The Influence of Cladding on the Springback of 2024-T3 Aluminium Alloy
Double curvature nacelle skin components are often produced in 2024-T3 Alclad aluminium alloy (clad both sides), using simple stretch forming. For this process uniaxial-tension is assumed to be the dominant mode of deformation. The observed springback in these components is generally minimized by inducing high levels of strain within the forming limits of the material. Experimental investigations to quantify the level of the springback have revealed an underlying aspect of material behaviour, which to the authors’ knowledge, has not been reported elsewhere. The results of this investigation have shown a remarkable dependence on specific material parameters unique to the Alclad material. Whilst previous investigations [1, 2, 3] have shown the influence of cladding, it has been assumed that cladding layers on both sides produce effects that are symmetrical about the mid-plane of the sheet. However, the current investigation has revealed a distinct asymmetry in springback behaviour. A detailed study of cladding thickness and strength, residual stresses and through-thickness material property changes has revealed that this asymmetry results from a complex combination of these parameters.
N. Ohno and T. Uehara
R. J. McMurray et al., "The Influence of Cladding on the Springback of 2024-T3 Aluminium Alloy", Key Engineering Materials, Vols. 340-341, pp. 853-858, 2007