Variable Strain Rate Forming Technique to Optimize Superplastic Forming of AA 5083 Using Multiscale Stability Analysis
Available studies of failure during SPD are based on either cavitation or geometrical necking. There exists no quantitative criterion that takes into account both failure modes. A new multiscale stability criterion is developed for SPD that takes into account both geometrical necking and microstructural features. Optimum variable strain rate deformation paths are then generated for SP AA5083 using the developed stability criterion. The model is then incorporated into ABAQUS FE code to simulate the SPF process. Effects of cavitation, grain size and strain rate sensitivity on the optimum forming paths are also investigated. It is shown that the proposed model can successfully predict well-established facts and observations about SPD. In addition, the effectiveness of the proposed optimization approach is verified using FEA.
Naveen V. THURAMALLA, Mohammad A. NAZZAL, M.K. KHRAISHEH
SPF, Multiscale Stability Criterion, Aluminum Alloy, Optimum Forming Paths, Finite Element Simulation.