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Conference Tools for NUMIFORM 2019: The 13th International Conference on Numerical Methods in Industrial Forming Processes
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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 Determination of Strain Dependent Anisotropy in Layer Compression Tests and Resulting Influence on the Yield Locus Modelling
Author(s) Matthias Lenzen, Marion Merklein
On-Site Speaker (Planned) Matthias Lenzen
Abstract Scope The improvement of the mapping accuracy in sheet metal forming simulations is an important field of research today. In this context, common materials like DC06 show a complex material behavior which makes it difficult to transfer the experimental data to a mathematical model. Especially the strain dependent material properties like the anisotropy and strain state dependent hardening are not respected adequate in conventional material models like Yld2000-2d due to the assumption of isotropic hardening. While the evolution of the Lankford coefficients in uniaxial tensile tests is well investigated, the anisotropy evolution under equi-biaxial loading is not considered strain dependent in numerical modelling yet. Therefore, layer compression tests with two 3d optical strain measurement devices are performed to identify the material characteristics in both principal strain directions. With the optical strain fields, the strain dependent anisotropy coefficient under equi-biaxial loading as well as the flow curve can be calculated. Results prove that the anisotropy value is not constant but shows a progression similar to the uniaxial material behavior. A strain dependent modelling with the identified properties leads to a significant change in yield locus geometry for DC06 at high strains. Numerical simulation with the identified strain dependent material properties should lead to a better accuracy regarding flange and sheet thickness distribution in the process design.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

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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