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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Material Behavior Characterization via Multi-Directional Deformation of Sheet Metal
Presentation Title Onset of Plasticity via Relaxation Analysis (OPRA)
Author(s) Amit Pandey, Robert Wheeler, Amit Shyam, Thomas B Stoughton
On-Site Speaker (Planned) Amit Pandey
Abstract Scope 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.
Proceedings Inclusion? Planned: A print-only volume


A Novel In-situ Planar Biaxial Experiment
Advanced Cruciform Testing at the NIST Center for Automotive Lightweighting
An Experimental and Microstructural Investigation of Biaxial Bauschinger Effects in Sheet Metals
An Experimentally Validated, Microstructure Based Model for Forming of Low-symmetry Alpha-uranium
Biaxial Loading of Anisotropic Al-6022-T4 Sheets Using Cruciform Specimens
Determination of Bending Limit Curves for Aluminium Alloy AA6014-T4: An Experimental Approach
Dilational Response of Voided Polycrystals
Effect of Complex Strain Paths on Microstructure Evolution Studied by In-situ Neutron Diffraction
Evalution of Formability in Aluminum Alloys across Strain Rates Using Digital Image Correlation Technique
Hardening Behavior of 316L SS Subject to Biaxial Strain Path Change: Multiscale Modeling for Guiding Experiments
Inflation of Stainless Steel 304L Microtubes under Axial Tension and Internal Pressure to Assess the Plastic Anisotropy
Modeling Anisotropic Hardening and Nonlinear Elasticity under Loading Path Change
Multi-scale Analysis of Springback in Microforming of Thin Nickel Sheets
On the Non-proportional Deformation of Sheet Steel Using In-situ Diffraction and Modelling Methods
Onset of Plasticity via Relaxation Analysis (OPRA)
Optimization of Biaxial Tensile Test Specimen Design
Predicting Cyclic Deformation of AA6022-T4 and DP590 Using Polycrystal Plasticity
Sensitivity Analysis of the Bauschinger Behavior on Bending Springback for Prestrained Sheets
The Influence of Deformation Mechanisms on Forming of Commercially Pure Titanium Sheets

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