|About this Abstract
||NUMIFORM 2019: The 13th International Conference on Numerical Methods in Industrial Forming Processes
||S-01: Modeling of the Anisotropic Behavior in Plasticity
||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
||Timothy J. Barrett, Milovan Zecevic, Marko Knezevic
|On-Site Speaker (Planned)
||Timothy J. Barrett
We present a multi-level simulation framework integrating a physically based polycrystalline homogenization model that takes into account microstructure and the directionality of deformation mechanisms acting at single-crystal level in predicting material behavior. In particular, we embed the elasto-plastic self-consistent (EPSC) material model within Abaqus finite element and use it to study the cup drawing of Al-6022-T4. Due to material anisotropy, the process resulted in directional dependent thinning of the cup around the punch radius and earing of the cup around the rim. Being able to simulate and understand these phenomenon are critical to reducing waste and preventing failure during the manufacturing process. The material anisotropy is calibrated through uniaxial and plane strain tension experiments. The cyclic response is calibrated through uniaxial tension-compression experiments. The comparison with experiments reveals that the plastic strain ratio or R-ratio plays a critical role in the accurate prediction of the cup height. Different textures are shown to have strong influence on the R-ratio and the overall cup height. Furthermore, Abaqus C3D8R, SC8R, and S4R elements are compared in terms of efficiency and accuracy. In all cases, the thickness and earing profile trends are captured using the material model.