|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||L-43: A Hybrid Fast Fourier Transform Based Elasto-Viscoplastic Formulation
||Jaspreet Nagra, Abhijit Brahme, Ricardo A Lebensohn, Raja K Mishra, Kaan Inal
|On-Site Speaker (Planned)
In the present work, a “hybrid” full field elasto-viscoplastic formulation is proposed that combines the finite strain Asaro-Needleman formulation with a computationally efficient fast Fourier transformation (FFT) based crystal plasticity model. The proposed hybrid model is calibrated using experimental uniaxial tensile test of AA5754 and is then used to predict response for equi-biaxial tension and plane strain tension. The predicted stress-strain and texture results show a good agreement with experimental measurements. For each strain path, the CPU time taken by the proposed hybrid model is compared with EVPFFT model. The proposed hybrid model is then used to predict forming limit diagram (FLD) by incorporating M-K formulation into the model. The predicted FLD for AA5754 and AA3003 are compared with experimental measurements. The proposed hybrid model showed significant time improvement than EVPFFT along with good agreement with experiment observations. The effects of grain morphology on FLD predictions are also presented.