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Meeting NUMIFORM 2019: The 13th International Conference on Numerical Methods in Industrial Forming Processes
Symposium S-01: Modeling of the Anisotropic Behavior in Plasticity
Presentation Title Prestraining Effect on Failure Behavior in Hole-Expansion Test of AA6022-T4 Sheet
Author(s) Jinjin Ha, Moritz Dirian, Christopher Dunn, Yannis P. Korkolis
On-Site Speaker (Planned) Jinjin Ha
Abstract Scope This study investigates the prestraining effect on failure during hole-expansion (HE) test of AA6022-T4 aluminum alloy sheet, for which the material is subjected to uniaxial prestraining followed by the HE test. The given test condition inevitably involves non-proportional loading path and prior deformation effect, in the spirit of multi-step forming operations used in industry. The full-field strain is measured by the Digital Image Correlation (DIC) system in every test. For prestraining, a wide specimen is stretched up to 8% of uniaxial deformation, which is equivalent to half of the max. uniform elongation. An HE specimen is then manufactured from the prestrained specimen, and the HE test is performed on a double-action hydraulic press with a punch dia. of 100 mm. In the experiments, the clear variation of thickness around the circumference is observed. This distribution is dependent on the prestraining direction, and is compared to the non-prestrained (i.e., as-received) HE test. Finite element (FE) simulations of the experiments are also conducted. The material model consists of the Yld2000-2d anisotropic yield function for the initial yield surface and Homogeneous Anisotropic Hardening (HAH) model, which is based on distortional hardening, to take into account the strain path change. The material parameters of the Yld2000-2d model are calibrated by uniaxial tension, plane-strain tension, and disk compression tests, and the ones of the HAH model are found by tension-compression and two-step tension tests with loading path changes. The simulation results for punch force-displacement and thickness strain variation around the circumference are compared with experiments.
Proceedings Inclusion? Undecided


A Comparative Study between Elasto-plastic Self-consistent Crystal Plasticity and Anisotropic Yield Function with Distortional Hardening Formulations for Sheet Metal Forming
Accurate Modeling of Experimental Strain-hardening Characteristics for Series of High Strength Steel
An Anisotropic Yield Model Reduced From The Yld2004-18p Function For Metals With Gentle Anisotropy Under Triaxial Loading
An Application of Homogeneous Anisotropic Hardening Model to Earing Predictions of Pre-strained Material
An Experimental Study on Yield Surface Evolution of a Trip-assisted Steel
Applications of a Stress Invariants-based Yield Criterion to DP980 & QP980 Steels
Characterization of Anisotropic Yield Criteria Using an Indentation Based Technique for Steel Sheets
Comparison of Strain-path Indicators for Analysis of Processes in Sheet-bulk Metal Forming
Determination of Strain Dependent Anisotropy in Layer Compression Tests and Resulting Influence on the Yield Locus Modelling
Material Modeling and Forming Limit Analysis of 6016-T4 Aluminum Alloy Sheet
Measurement of Unloading Behavior of AHSS and Its Effect on the Springback Prediction in FEM Simulation
Modeling of Sheet Metal Forming Based on Implicit Embedding of the Elasto-plastic Self-consistent Formulation in Finite Elements: Application to Cup Drawing of AA6022-T4
Modeling of the Differential Hardening of Pure Titanium Sheet and Application to Hole Expansion Forming Simulation
Numerical Integration of Isotropic and Anisotropic Plasticity Models
Plastic Anisotropy from Single Crystal to Multi-phase Steels
Prestraining Effect on Failure Behavior in Hole-Expansion Test of AA6022-T4 Sheet
Rate-dependent Tension and Compression Hardening Behaviors of Ahss for Sheet Metal Forming Simulation
Springback Prediction in Roll Forming using Nonlinear Kinematic and Homogeneous Anisotropic Hardening Models
Study on Hot Deformation Behavior and Microstructure of 5CrNiMoV Steel using Constitutive Modeling and Processing Map
Theory and Application Study of Springback Prediction Accuracy for QP Steel with Different Material Hardening Models

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