|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Material Behavior Characterization via Multi-Directional Deformation of Sheet Metal
||Onset of Plasticity via Relaxation Analysis (OPRA)
||Amit Pandey, Robert Wheeler, Amit Shyam, Thomas B Stoughton
|On-Site Speaker (Planned)
A strong interest in the design of lightweight systems, particularly in the automotive industry, has pushed the small scale definitions of yield point towards a more realistic lower limit and the ultimate goal would be the identification of the very earliest evidence of plastic deformation. The reason for this is that “springback”, which is the change of shape of a stamped part as it is removed from the forming tools and trimmed, is caused by the unloading of the forming or residual stresses and their associated elastic strains. It is necessary to predict this springback in order to minimize it early in the product design stage. In the present work, we introduce a new methodology for the determination of the true yield point based on stress relaxation. We show experimentally that this determination is self-consistent in nature and, as such, provides an objective observation of the very onset of plastic flow.
||Planned: A print-only volume