再结晶软化效应对Ti-6Al-4V修正本构的影响  

Recrystallization Softening Effect in the Improved Constitutive Equation for TI-6AL-4V Alloy

作　　者：刘丽娟[1,2] 吕明[2] 武文革[1] 

机构地区：[1]中北大学,山西太原030051 [2]太原理工大学,山西太原030024

出　　处：《稀有金属材料与工程》2014年第6期1367-1371,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50975191);山西省回国留学人员科研资助项目(2013-086);中北大学校基金

摘　　要：通过对分离式霍普金森压杆实验应力-应变数据的分析,考虑到再结晶软化效应对材料本构的影响情况,建立了J-C修正本构模型,该模型用2个表达式来表示不同临界应变值区间材料本构的特点;利用增量法建模,屈服服从Huber-Mises准则,应力更新采用径向回退法,使用Fortran语言编写了基于AdvantEdge FEM的子程序。通过对2种本构及高速铣削实验数据的分析与比较,证明了在表现高速切削Ti-6Al-4V合金的切屑形态时,修正J-C本构比J-C本构更适用。A modified J-C constitutive model based on recrystallization softening effect was established by stress-strain data analysis of a SHPB experiment. The modified constitutive model according to different characteristics of material constitutive in the critical strain value range, was expressed as two expressions. The modeling of new amendment J-C constitutive model which considers recrystallization softening effect uses the incremental method, the yield obeys Huber-Mises yield criterion, the stress update uses the radial return method, and a subroutine based on AdvantEdge FEM is written by the Fortran language. Amendment J-C constitutive model and J-C constitutive model as well as experimental data of high-speed milling were compared and it indicates that amendment J-C constitutive is more suitable than J-C constitutive when expressing the formation process of chip morphology and shear characteristics for high-speed milling.

关 键 词：本构方程 动态再结晶 有限元仿真 高速切削 

分 类 号：TG146.23[一般工业技术—材料科学与工程]