Industry 4.0 in stamping: A wrinkling indicator for reduced-order modeling of deep-drawing processes
Kelin Chen, Yannis P. Korkolis
Abstract
Flange wrinkling is often seen in deep-drawing process when the applied blankholding force is too small. This paper investigates the plastic wrinkling of the flange under a constant blankholding force. The strain and stress state in the flange are first established and a plastic wrinkling reduced-order model is then proposed using energy method. The reduced-order model is implemented to predict the flange wrinkling of AA1100-O sheet by incrementally updating the flange ratio and other material parameters along the drawing process. A finite element model is developed in ABAQUS/standard to verify the results from the reduced-order model. The predicted punch displacements and wave numbers at the onset of wrinkling agree well with the simulated results for different blankholding forces, which demonstrates the accuracy of the reduced-order model and its potential application in fast prediction of wrinkling in deep-drawing process.