|About this Abstract
||NUMISHEET 2021: The 12th International Conference on Numerical Simulation of 3D Sheet Metal Forming Processes
||On the Prediction of the Plastic Instability of AA7075-O and H240LA Steel Sheets under Complex Deformation Histories
||Andres J. Martinez-Donaire, Luis Humberto Martínez-Palmeth, Domingo Morales-Palma, José Andres López-Fernández, Gabriel Centeno, Carpóforo Vallellano
|On-Site Speaker (Planned)
||Andres J. Martinez-Donaire
The most common failure mechanism in conventional sheet metal forming is the appearance of localized necking and the subsequent ductile fracture. These processes usually evolve under complex deformation histories and non-uniform stress/strain distributions, making not applicable the use of the Forming Limit Curve (FLC) at necking for predicting the formability of the metal sheet within the Forming Limit Diagram (FLD).
This work revisits two failure models developed by the authors for predicting failure by necking applied to AA7075-O and H240LA steel sheets. The models combine both the use of path-independent diagrams, based on the Forming Limit Stress Diagram (FLSC) and the equivalent plastic-FLC curve (epFLC), along with the concept of Critical Distance Rule (CDR) to account for the effect of the non-uniform stress/strain distribution. The numerical predictions of the formability limits using several values of critical distance are successfully compared and discussed in the light of experimental stretch-bend tests.
||Definite: At-meeting proceedings