中南大学学报（自然科学版）2017，Vol.48Issue(11)：2942-2948,7.DOI:10.11817/j.issn.1672-7207.2017.11.014
基于蠕变时效交互作用机理的2219铝合金统一本构建模
Unified constitutive modeling of creep aging behavior of AA2219 based on interaction of creep and aging interactive mechanism
摘要
Abstract
The creep aging behavior of AA2219 was studied at different aging temperatures and stresses. Then, series of mechanical property tests and TEM tests were carried out to obtain the evolutions of the mechanical property and precipitate behavior. The relationship of the creep strain, the precipitates size and the mechanical properties were also investigated. Based on the experimental results, a set of unified constitutive model of AA2219 was established based on the interaction of creep and aging mechanisms. The material constants of the established model were fitted by the particle swarm optimization(POS) method. The fitted results and experimental data of creep strain and yield strength were compared. The results show that test stress, aging temperature and aging time can affect the creep behavior of AA2219 significantly. The duration of the second creep stage is shortened and the arrival of the third creep stage (the damage stage) is brought ahead when the test stress or the aging temperature increase. The relative errors of fitting results of the creep strain and yield strength are 2.70% and 0.70% separately, which shows that the unified constitutive model based on the interaction of creep forming and age hardening can be well used to describe the creep aging behavior.关键词
2219铝合金/蠕变时效/本构建模Key words
AA2219 alloy/creep aging/constitutive model分类
矿业与冶金引用本文复制引用
李喜财,湛利华..基于蠕变时效交互作用机理的2219铝合金统一本构建模[J].中南大学学报（自然科学版）,2017,48(11):2942-2948,7.基金项目
国家重点基础研究发展计划(973计划)项目(2014CB046602) （973计划）
国家自然科学基金资助项目(51235010) （51235010）
国防科工局重大项目课题(JCKY2014203A001) (Project(2014CB046602) supported by the National Basic Research Development Program(973 Program) of China （JCKY2014203A001）
Project(51235010) supported by the National Natural Science Foundation of China （51235010）
Project(JCKY2014203A001) supported by the State Administration of Science Technology and Industry for National Defense) （JCKY2014203A001）
