Transactions of Materials and Heat Treatment

Title：Research on numerical simulation for cavity closure prediction model

Authors： Qin Min Liu Jiansheng

Unit： Taiyuan University of Science and Technology

KeyWords： cavity closure upsetting effective strain hydrostatic stress cavity bonding

ClassificationCode：TG316

year,vol(issue):pagenumber：2020,45(6):8-15

Abstract：

For the upsetting process, the evolution law of cavity closure under compressive stress status was studied, and the cavity closure prediction model under compressive stress status was established. However, the factors often used to describe and characterize cavity closure during forming process of forgings were effective strain, hydrostatic stress and stress triaxiality. Therefore, the upsetting processes with and without cavity model were simulated numerically respectively, and the relationships between these factors and the process of cavity closure were analyzed respectively by simulation results. It is found that Mises effective strain not only reflects the closure process of the same cavity, but also reflects the closure state of cavities in different positions at the same time. Furthermore, the upsetting processes of cylinders with height to diameter ratios of 0.75,1,1.5 and 2 were simulated and calculated respectively, the relationship between Mises equivalent strain and cavity closure rate K was established, and the complete cavity closure prediction model including cavity compression stage model and cavity bonding stage model was obtained. Finally, the cavity closure prediction model was implanted into the software DEFORM by the secondary development to generate a user-defined parameter K, and the cavity closure status in any position during the forming process can be directly observed in the post-processing module of software DEFORM.

Funds：

国家自然科学基金资助项目(51775361);山西省自然科学基金重点资助项目（201601D011002）

秦敏（1980-），女，博士，讲师 E-mail：wsqm2008@163.com 通讯作者：刘建生（1958-），男，博士，教授，博士生导师 E-mail：jiansliu@163.com

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