Shape distortion and thickness distribution during SPIF processes: experimental and numerical analysis

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Abstract

Single Point Incremental Forming (SPIF) is a quite new sheet forming process whichoffers the possibility to deform complex parts without dedicated dies using only a single point tooland a standard 3-axis CNC machine. The process mechanics enables strains much higher thantraditional sheet forming processes, but particular attention must be given to the final partgeometrical accuracy. In this paper the capabilities of a dedicated explicit numerical model arequantitatively analyzed on pyramid-shaped parts. In particular a comparison between experimentaland numerical results is reported. Three different shapes at the varying of the stamping angle wereconsidered and the final shape was acquired, through a white light triangulation based opticalscanner, after the removing of the punch and of the clamping fixture. LS-DYNA commercial codewas used to simulate the three different case studies, and an explicit loading-implicit unloadingapproach was implemented in order to simulate also the shape distortions due to springbackphenomenon. The effect of several numerical parameters on the final shape and the thicknessdistribution were investigated. In particular numerical results were analyzed at the varying of thematerial constituve law, of the shell element type and of the number of integration points along thethickness.
Lingua originaleEnglish
Titolo della pubblicazione ospiteKEY ENGINEERING MATERIALS
Pagine913-918
Numero di pagine6
Stato di pubblicazionePublished - 2011

All Science Journal Classification (ASJC) codes

  • ???subjectarea.asjc.2500.2500???
  • Mechanics of Materials
  • Mechanical Engineering

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