采用基于快速傅里叶变换的谱解法研究Mg-Y合金的变形机理

发布时间：2021-08-02 21:46

　　在镁中加入钇（Y）可以提高屈服强度和延展性,然而其机理尚不明确。采用模拟的方法可以更加有效的理解变形过程中Y元素的作用。本文采用了晶体塑性的快速傅里叶变换方法（CPFFT）模拟了原位拉伸过程中Mg-3wt.%Y合金在晶粒尺度的变形行为。结果表明,CPFFT成功预测了拉伸曲线,并可以预测特定晶粒在不同加载步下的取向演变和应力演变。相比于基于位错的弹性粘塑性自洽（EVPSC）模型,CPFFT有效的预测晶粒中的晶粒旋转和应力变化。最后,对模拟结果与实验结果在晶粒旋转和应力方面的误差原因进行了讨论 

【文章来源】：上海交通大学上海市 211工程院校 985工程院校 教育部直属院校

【文章页数】：76 页

【学位级别】：硕士

【文章目录】：
摘要
ABSTRACT
Chapter 1: Introduction
Chapter 2: Bibliography about Crystal plasticity theory and model
    2.1 Crystal plasticity commonly used theory
    2.2 Crystal plasticity using The Dusseldorf Advanced Material Simulation Kit (DAMASK)
    2.3 Full field model working with DAMASK
        2.3.1 Crystal Plasticity Finite Element Model (CPFEM)
        2.3.2 Crystal Plasticity Fast Fourier Transform Model (CPFFT)
    2.4 Mean field approach: Elastic viscoplastic self-consistent model
Chapter 3: Input and constitutive framework for the model
    3.1 Sample properties and experiment data
    3.2 Generation of the sample microstructure
    3.3 Input parameters
Chapter 4: Results and discussion
    4.1 Macroscopic deformation
    4.2 Mesoscale deformation
    4.3 Statistical analysis of the stress in each grain
        4.3.1 Stress evolution in every grain
        4.3.2 Efficiency of the simulation of every grain
Chapter 5: Going further to improve the model accuracy
    5.1 Analyzing input parameters to understand the difference of grain simulation results
    5.2 Influence of grain definition
    5.3 Discussion and recommendation for future studies
Chapter 6: Conclusion
Acknowledgment
Reference
Appendix : Grains COMS positions, Euler angle and radius



本文编号：3318333