| 研究課題/領域番号 |
15F15705
|
|---|
| 研究機関 | 東京大学 |
|---|
研究代表者 |
小関 敏彦 東京大学, 工学(系)研究科(研究院), 教授 (70361532)
|
|---|
| 研究分担者 |
LIU MAO 東京大学, 工学(系)研究科(研究院), 外国人特別研究員
|
|---|
| 研究期間 (年度) |
2015-11-09 – 2018-03-31
|
| キーワード | Crystal plasticity / Finite element method / ECAP / Simulation / UFG materials / Constitutive law / Mechanical properties / TRIP steel |
|---|
| 研究実績の概要 |
1.I have successfully established a three-dimensional equal-channel angular pressing (ECAP) crystal plasticity FEM (CPFEM) model for investigating the mechanical properties and texture evolutions of single-crystal aluminum. Although numerous researchers have done conventional FEM or CPFEM modeling study of ECAP for the last decade, most of them only conducted two-dimensional investigation. However, the results from 2D studies is not quite accurate and perfect since the conditions are quite different from those of experiments in reality. In addition, the deformation mechanism has not been well explained experimentally due to the limitation of the ECAP tests (Eg. The mechanical properties and texture can only be measured at the final step of the ECAP and the area chosen for conducting EBSD or TEM tests are quite small comparing to the entire deformed billet) .The 3D CPFEM simulation of ECAP is a challenging topic because it is very difficult to get convergence when metallic materials go through a severe plastic deformation (SPD). It is also time-consuming even a large number of CPUs are used due to the nature of SPD and the large quantity of elements.
2.The numerical results have been validated by comparing with the experimental observations in terms of texture evolution during SPD, which demonstrated that the FEM model and the parameters for the crystal plasticity constitutive equations are correct.
3.An academic paper will been prepared for publication and now it is in the half way.
|
| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
1.Firstly, I have been in the research area of crystal plasticity finite element modeling for more than five years, and thus I have been familiar with the software used for conducting researches as well as the method to do the post-processing and data analysis.
2.I keep reading academic papers published in the high-quality journals, which will enrich my knowledge and broaden my horizons.
3.I discussed my researches with my supervisors, cooperators and friends now and then, from whom I can get more new ideas and inspirations.
4.I focus on the details when conducting numerical researches, and I always repeat modeling till the results are satisfactory.
5.The passion for researches and the desire for publishing high-quality papers push me to work hard and solve problems encountered during the study.
|
| 今後の研究の推進方策 |
1.I will debug the parameters for modeling single-crystal copper undergoing ECAP later. Currently, two differently constitutive hardening laws have been used to conduct CPFEM simulation. However, the influence of hardening law on the mechanical properties of ECAPed metallic materials has never been discussed in the past.
2.The Al bicrystal and Al-Cu bicrystal ECAP model will be established later to investigate the influences of grain boundary and phase boundary on the mechanical properties and texture evolution of materials undergoing SPD.
3.The 3D CPFEM model combined with DAMSK will be established to predict the mechanical properties and the phase-transformation phenomenon of TRIP steel during plastic deformation.
|
