| 학회 | 한국재료학회 |
| 학술대회 | 2013년 봄 (05/23 ~ 05/24, 여수 엠블호텔(THE MVL)) |
| 권호 | 19권 1호 |
| 발표분야 | E. 구조 재료(Structural Materials) |
| 제목 | Crystal Plasticity Finite Element Method and its Applications |
| 초록 | Crystallographic texture, i.e. preferred orientation, plays a dominant role in determining the anisotropy and formability of polycrystalline materials. Polycrystal plasticity models have been developed to help researchers understand the relationship between crystallographic texture and the plastic behavior of polycrystalline materials. This seminar will briefly introduce the theoretical applications that depend on the use of polycrystal plasticity models at the Micromechanics & Microstructure Control Laboratory of Sunchon National University. The crystal plasticity finite element method (CPFEM) has been developed for the simultaneous consideration of texture evolution and strain heterogeneity under realistic boundary conditions. The CPFEM also has been applied to determine the orientation-dependent stored energy in interstitial free steels, as well as to find that the formation of in-grain orientation gradients and the inhomogeneity of a local average misorientation can be enhanced by the hard martensite particles in dual phase steels. A CPFEM based on representative volume elements (RVE) was applied to determine the microscopic hardening parameters for constituent phases of multi-phase steels by fitting the measured macroscopic stress and measured lattice strains. By using a technique for the direct mapping of filtered microstructure into finite element meshes, CPFEM can capture the heterogeneity of strain-stress partitioning and the effect of microstructure heterogeneity on the hot spots for void formation in DP980 steel during uniaxial tension. A CPFEM, considering both crystallographic slip and deformation twinning, has been developed to theoretically explain both the asymmetric behaviors of tension-compression yielding as well as the r-values evident in AZ31 Mg alloys. By using a direct-mapping technique for EBSD data, the CPFEM can capture the heterogeneity of stress concentration at the grain boundaries in AZ31 Mg alloys during in-plane compression. Crystallographic orientations taken from EBSD data have been assigned to a 3-D digital microstructure in order to match the experimentally measured misorientation distribution. The CPFEM has been used to capture the heterogeneity of slip and twin activities at the grain boundaries in AZ31 Mg alloys during in-plane compression, and has demonstrated that deformation twinning enhances non-basal slip activity in twinned regions. |
| 저자 | Shi-Hoon Choi |
| 소속 | Sunchon National Universty |
| 키워드 | EBSD; RVE; CPFEM |
