• So, B.
• Ko, T.
• Park, D.
• Yarlagadda, Prasad Kdv
• Bae, W.
• Jeong, H.

Abstract

Upon unloading in a forming process there is elastic recovery, which is the release of the elastic strains andthe redistribution of the residual stresses through the thickness direction, thus producing surface deflection.It causes changes in shape and dimensions that can create major problem in the external appearance of outerpanels. Thus surface deflection prediction is an important issue in sheet metal forming industry. Manyfactors could affect surface deflection in the process, such as material variations in mechanical properties,sheet thickness, tool geometry, processing parameters and lubricant condition. The shape and dimensionproblem in press forming is defined as a trouble mainly caused by the elastic recovery of materials during theforming. The use of high strength steel sheets in the manufacturing of automobile outer panels has increasedin the automotive industry over the years because of its lightweight and fuel-efficient improvement. But oneof the major concerns of stamping is surface deflection in the formed outer panels. Hence, to be costeffective, accurate prediction must be made of its formability. The automotive industry places rigid

Topics

• impedance spectroscopy
• surface
• strength
• steel
• forming