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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Material Behavior Characterization via Multi-Directional Deformation of Sheet Metal
Presentation Title Modeling of Hole-expansion of Prestrained Sheets Using Distortional Hardening
Author(s) Yannis P. Korkolis, Jinjin Ha
On-Site Speaker (Planned) Yannis P. Korkolis
Abstract Scope The hole-expansion of AA6022-T4 is investigated with respect to prestraining effect, and is simulated by the Yld2000-2D yield function combined with the HAH distortional hardening model. The experiment is performed in two steps: first, 8% of uniaxial prestraining is accomplished; then, hole-expansion is conducted by a flat-headed punch. Digital image correlation (DIC) provides the in-plane strain contours throughout the loading. The anisotropy of the material is clearly visible in these contours, which are non-axisymmetric. For the case of non-prestrained sheets, the strain evolution can be captured very accurately by isotropic hardening and the Yld2000-2D yield function. For the case of prestrained sheets, it is experimentally observed that the location of failure shifts from ~45o to RD. It is shown that the current version of the HAH model is deficient in capturing the evolution of the thickness contours, and in predicting the shift in the location of failure.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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