纯钼烧结体压缩变形本构模型建立  

ESTABLISH OF CONSTITUTIVE MODEL FOR PURE SINTERED MO POWDER IN COMPRESSION DEFORMATION

作　　者：李萍[1] 薛克敏[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009

出　　处：《固体力学学报》2012年第3期331-335,共5页Chinese Journal of Solid Mechanics

基　　金：国家自然科学基金项目(50875072);霍英东教育基金会项目(121053)资助

摘　　要：基于可压缩连续材料的屈服准则和塑性本构关系,推导了粉末烧结材料的压缩变形屈服条件.采用真空烧结技术制备了不同密度的钼,通过在MTS810实验机上进行单向压缩试验,研究了在不同的初始密度、变形温度和应变速率的条件下,纯钼烧结体压缩变形流变应力的变化规律.建立了其流变应力的经验回归模型,进而确定了纯钼烧结材料压缩变形的屈服条件.在此基础上,建立了钼粉烧结材料压缩变形的弹塑性本构模型.这些研究对于提高钼粉烧结材料成形工艺模拟的精度和制定合理的塑性成形工艺具有重要意义.Based on the yield criterion and plastic constitutive equation for compressible dense materials,the yield function for sintered powder materials during plastic compression deformation was derived. Cylindrical Mo specimens with different values of the initial relative density were prepared by using vacuum sintering technology. The effects of the initial relative density, deformation temperature and strain rate on the flow stress of the sintered Mo powder were studied by uniaxial compression tests proceeded at MTS810 system. The empirical regression model of the flow stress was established and the yield criterion during compression deformation was determined. Based on these studies, the elasto-plastic constitutive model for the sintered Mo powder was established. These studies are significant for improving the simulation accuracy and formulating reasonable forming process for sintered Mo powder.

关 键 词：本构模型 屈服条件 纯钼烧结体 压缩变形 

分 类 号：TF124.5[冶金工程—粉末冶金]