Single‐point incremental forming and formability—failure diagrams

By M. B. Silva, M. Skjoedt, Anthony G. Atkins, Niels Bay, Paulo A.F. Martins. 2008

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Critical analysis of necking and fracture limit strains and forming forces in single-point incremental forming (2014, methodology): “However, for this material, a clear trend towards failure by ductile fracture in the absence of necking does not appear, contrary to what is observed in some aluminium alloys deformed by SPIF for high t0/R ratios [2,21–23].”
Review on the influence of process parameters in incremental sheet forming (2016, background): “[20] investigated the forming limit of aluminium AA1050-H111 sheet in SPIF.”
Failure mechanisms in single-point incremental forming of metals (2011, methodology): “Failure by fracture with suppression of necking is commonly observed in SPIF with tools having standard radius, and the limiting fracture strains are governed by the FFL in the principal strain space [ 10 ].”
Research and Progress in Incremental Sheet Forming Processes (2011, background): “Others state that formability is limited by fracture due to the inability of necks to grow and that FLCs, that give the loci of necking strains, are not relevant and should be replaced by the fracture forming lines (FFLs) [47].”