Paper Title:
The Influence of Through-Thickness Material Property Variation on Stretch Forming Springback

Stretch forming is commonly used in the manufacture of low-volume convex aircraft panels. The gentle curvature and high degree of stretch leads to relatively low levels of elastic recovery post forming. Previous investigations [1] have shown that there is a large difference in the measured springback depending upon which side of an Alclad aluminium sheet is in contact with the tool surface. Initial investigation into the clad layer properties revealed no accountable variation in either thickness or strength. Instead the asymmetric springback behaviour was attributed to material property variations through the alloy core of the sheet. An analytical method for the prediction of the asymmetric springback incorporating the through thickness property variation is presented. Material strengths at specific through thickness positions were determined using a procedure based on residual strength measurements. The predicted results correlate well with the experimental data, which had initially demonstrated the asymmetric springback

Main Theme
Edited by
J.R. Duflou, R. Clarke, M. Merklein, F. Micari, B. Shirvani and K. Kellens
Robert J. McMurray et al., 2011, Key Engineering Materials, 473, 436
Online since
March 2011
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