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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 Modeling of the Differential Hardening of Pure Titanium Sheet and Application to Hole Expansion Forming Simulation
Author(s) Chiharu Nagano, Toshihiko Kuwabara, Ryoji Kawamura, Yuta Shimada
On-Site Speaker (Planned) Toshihiko Kuwabara
Abstract Scope Uniaxial and biaxial tensile tests of a JIS #1 pure titanium sheet are performed to determine an accurate material model to be used in sheet metal forming simulations of the material. Uniaxial tensile tests are performed at every 15ᵒ from the rolling direction (RD). Biaxial tensile tests with seven liner stress paths in the first quadrant of a principal stress space are performed using the multiaxial tube expansion testing method developed by Kuwabara and Sugawara (2013). Contours of plastic work (CPW) and the directions of the plastic strain rates are precisely measured at different levels of plastic work. The maximum plastic strain applied to the material under biaxial tension is 0.3. It is observed that the shapes of the CPW significantly change with plastic work; the material shows differential hardening (DH). The Yld2000-2d yield function (Barlat et al., 2003) is applied to reproduce the DH, in which the exponent and material parameters (alpha 1 to 8) of the Yld2000-2d yield function are changed as functions of plastic strain. Furthermore, the DH model is applied to a finite element analysis of a hole expansion forming of the test material. It is found that the DH model can predict the thickness distribution along the RD and the position of the minimum thickness.
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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