In situ laminography investigating damage evolution and strain heterogeneity during plane strain tension loading and non-proportional loadin

The aim of this study is to identify the deformation and damage interactions of aluminium alloy sheets under plane strain tension conditions for different microstructures. Plane strain tension conditions are identified as critical in forming processes as early localization and the lowest deformation at fracture are found under these conditions. Using flat samples with local thickness reductions, the plane strain state can be achieved. In contrast to tomography, in situ laminography allows the evolution of the microstructure and damage as well as strain (via image correlation techniques) to be studied in the plane strain tension zone. In addition, the role of pre-strain on failure in plane strain tension will be investigated by performing a load path change on a newly designed sample. The role of crystallographic texture, obtained by complementary EBSD, on strain heterogeneity and localization followed by damage and failure will be further investigated by simulations.