Establishment of Constitutive Equations of Material in Regions and Numerical Simulation of Micro-bulk-forming
Based on the mechanism of micro-bulk-forming and its traditional surface layer model, a new regionalizing model with different regions used for the numerical analysis of the micro-bulk-forming was proposed. The object was divided into the inner polycrystalline region, the inner region of the grains and the region affected by the grain boundary in the surface layer. Depending on the Hall-Petch formula, which is applicable to describe polycrystal materials, and introducing scale parameters, the constitutive equation of each region was established through regressing the micro-upsetting experiment data of the copper samples. Then the micro-upsetting process was simulated based on the new regionalizing model where the different constitutive equations were introduced to the different regions. Compared to the traditional finite element model of macro-forming, the simulation results reflected the characteristics of micro-forming and were consistent with the experiment results, which certified the reliability of the constitutive equations and the numerical simulation model.
Micro-bulk-forming Regionalizing model Hall-Petch form
G.C.Wang W.Zheng
School of Materials Science and Engineering (Shandong University, Jinan)
国际会议
2nd Asian Workshop on Macro/Nano Forming Technology(AWMFT-2009)(第2届亚洲微米纳米技术研讨会)
长沙
英文
635-639
2009-10-25（万方平台首次上网日期，不代表论文的发表时间）