Analysis of Thickness Distributions Calculated from Surface Strains Obtained through Digital Image Correlation for Incremental Sheet Forming

This paper discusses the thickness distributions calculated from surface strain measurements using stereo Digital Image Correlations (DIC) for parts produced with Single Point Incremental Forming (SPIF). The research is carried out on six benchmark cones and pyramids each convex, straight concave walls. accuracy of calculations, under assumption material incompressibility formula Green-Lagrange strains, compared to measured a fringe projection scanner. estimations based strains proved be representative mean error 0.0182 mm, which corresponds relative 1.47 % thickness. However, errors up 0.1688 mm were found in areas high wall angles curvatures, corresponding maximal 13.69 Hence, DIC are well suited characterizing Using thicknesses find minimal as an indicator part failure, possible that have average overestimation 2.87%