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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Material Behavior Characterization via Multi-Directional Deformation of Sheet Metal
Presentation Title Modeling of Hole-expansion of Prestrained Sheets Using Distortional Hardening
Author(s) Yannis P. Korkolis, Jinjin Ha
On-Site Speaker (Planned) Yannis P. Korkolis
Abstract Scope The hole-expansion of AA6022-T4 is investigated with respect to prestraining effect, and is simulated by the Yld2000-2D yield function combined with the HAH distortional hardening model. The experiment is performed in two steps: first, 8% of uniaxial prestraining is accomplished; then, hole-expansion is conducted by a flat-headed punch. Digital image correlation (DIC) provides the in-plane strain contours throughout the loading. The anisotropy of the material is clearly visible in these contours, which are non-axisymmetric. For the case of non-prestrained sheets, the strain evolution can be captured very accurately by isotropic hardening and the Yld2000-2D yield function. For the case of prestrained sheets, it is experimentally observed that the location of failure shifts from ~45o to RD. It is shown that the current version of the HAH model is deficient in capturing the evolution of the thickness contours, and in predicting the shift in the location of failure.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A New Yield Criterion Accounting for Anisotropy and Anisotropic Asymmetry from Near Isotropy to Triclincity
An Investigation into Improved Elongation-to-fracture in AHSS via Continuous Bending Under Tension
Damage Detection of Sheet Metal via Multi-directional Deformation
Development of a Lean Duplex TRIP Steel with a Superior Formability
Effects of Y Concentration on Mechanical Response of Mg-Y Alloys
Evolution of Local Formability Concepts for Advanced High Strength Steels (AHSS)
Experimental Studies into the Role of Cyclic Bending during Stretching of Dual-phase Steel Sheets
Formability of Textured Anisotropic Uranium Plate
High Precision Material Modeling of 5000 Series Aluminum Alloy Sheet Using Biaxial Tensile Tests and Hole Expansion Simulation
In-situ Neutron Diffraction of Strain Path Change Effects in Cold-rolled MgAZ31B Sheet
Industry Perspective on the Mechanical Characterization of Next Generation Steels
K-137 (Invited): Understanding Room Temperature Softening Behavior in AA5182
Large-strain Cruciform Testing for Characterization of Macro- and Micro-scale Formability of Sheet Metals
Material Modeling in Biaxial Stress Field and Hole Expansion Simulation of Hot-rolled Steel Sheets
Measuring the Multiaxial Nature of Thermomechanical Constitutive Relationships of Crystalline Materials
Microstructural Response of Stainless Steel Subjected to Biaxial Load Path Changes: In-situ Neutron Diffraction and Multi-scale Modeling
Microstructure Control for Enhanced Multi-step Formability
Modeling Anisotropic Plasticity Under Complex Loading Conditions: Effects of Loading Path Changes on Flow Stress, Springback and Formability of Sheet Metals
Modeling of Hole-expansion of Prestrained Sheets Using Distortional Hardening
Multi-directional Deformation Capabilities in the NIST Center for Automotive Lightweighting (NCAL)
Multiscale Modeling of Self-piercing Riveting Process
Production of Commercially Pure Aluminum Strips via a Single-Step, Machining-based Technique
Strain Localization and Damage in a α+β Titanium Alloy: A Study of Microstructure Heterogeneity and Strain Path Effects

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