Development of coupling scheme for micro- and macroscopic mechanics using phase field model

在多相场模型的基础上，建立了考虑微观组织与材料宏观性能多尺度关系的材料力学数值模型。考虑了各相的力学性能，建立了研究复杂形状和微观组织形态对宏观行为影响的模型。通过对多晶材料和片层结构中微观应力分布的模拟，验证了模型的有效性。建立了两相界面物理状态的分子动力学模型，考察了各相性质对宏观性质的影响。

Numerical model for mechanics of materials including the multi-scale relationship between microstructure and macroscopic material properties was developed based on multi-phase-field model. Mechanical properties of each phase were taken into account, and the modeling for investigating the effect of complex shape and morphology of microstructure on the macroscopic behavior was constructed. Availability of the developed model was validated by demonstrating simulations on microscopic stress distributions in polycrystalline material and lamellar structures. Molecular dynamics model was also developed to focus on the physical situation at the two-phase interface, and the influence of the properties of each phase on the macroscopic properties was investigated.