预变形2219铝合金应力松弛时效成形统一本构建模及回弹预测（英文）

论文摘要

通过应力松弛时效实验和有限元仿真研究预变形2219铝合金应力松弛行为。结果表明:应力能促进时效析出进程,缩短到达峰值强度的时间。且初始应力越大,时效后的剩余应力越高,合金的屈服强度越大。基于显微组织演变和时效强化理论建立统一本构模型,并通过子程序开发将其嵌入有限元仿真模型中。发现仿真回弹后的半径与实验值间的相对误差为3.6%,回弹为16.8%。从而可知,所建立的应力松弛时效本构模型能较好预测带筋壁板时效过程中的回弹行为。

论文目录

• 1 Introduction
• 2 Experimental
•   2.1 Material
•   2.2 Stress relaxation ageing tests
•   2.3 Mechanical property tests and microstructure characterization
•   2.4 Statistics of precipitates
•   2.5 Validation of stress relaxation ageing constitutive model
• 3 Results and discussion
•   3.1 Stress relaxation ageing behavior
•   3.2 Stress relaxation ageing property
•   3.3 Microstructure evolution
•   3.4 Quantitative characterization of precipitation
• 4 Unified constitutive modeling of stress relaxation ageing
•   4.1 Establishment of model
•   4.2 Material constants
•   4.3 Validation of stress relaxation ageing constitutive model
• 5 Springback prediction and validation of grid panel component
•   5.1 Simulation of grid panel component
•   5.2 Ageing forming of grid panel component
•   5.3 Springback prediction
• 6 Conclusions

文章来源

类型: 期刊论文

作者: 汪凯,湛利华,杨有良,马子尧,李喜财,刘健

关键词: 铝合金,应力松弛时效,统一本构模型,回弹

来源: Transactions of Nonferrous Metals Society of China 2019年06期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 金属学及金属工艺

单位: 中南大学机电工程学院,中南大学高性能复杂制造国家重点实验室

基金: Project(2017YFB0306300)supported by the National Key Research and Development Program of China,Project(2014CB046602)supported by the National Basic Research Program of China,Project(20120162110003)supported by Specialized Research Fund for the Doctoral Program of Higher Education of China,Project(51235010)supported by the National Natural Science Foundation of China

分类号: TG146.21

页码: 1152-1160

总页数: 9

文件大小: 1390K

下载量: 171