金属粉末材料压制过程的修正屈服模型  

A Modified Yield Model of Powder Metal Material for Compaction Process

作　　者：林启权[1] 颜明[1] 杨辅 彭传东 

机构地区：[1]湘潭大学机械工程学院,湘潭411105

出　　处：《材料导报》2015年第22期145-149,共5页Materials Reports

基　　金：科技部国际合作项目(2012DFG70640;2010DFA52130);国家自然科学基金(51175445);湖南省自然科学基金(14JJ2066)

摘　　要：基于连续力学基础,应用金属粉末单轴压缩屈服理论,并考虑粉末材料因子和压坯初始相对密度的影响,获得了一个新的塑性泊松比表达式,进而建立了适合于金属粉末压制过程的屈服模型。对铁粉、铜粉和铝粉粉末体进行单轴压缩实验,通过研究相对密度与轴向塑性应变、塑性泊松比、粉末烧结体材料几何硬化系数的关系以及3J′2/Y0-J1/Y0平面中的屈服轨迹,验证了建立的修正屈服模型具有更高的精度。A theoretical model for the uniaxial compression of powder materials based on continue mechanics was presented. To further modify the model, initial relative density of compact and parameter of powder material were considerated. A new plastic poisson＇s ratio expression and a new yield model for compressible P/M materials were derived. Uniaxial compression experiments of iron powder, copper powder and aluminum powder were conducted, tb, e yielding model with modification was proven to be better in precision via studying the relationships between relative density and axial plastic strain, plastic poissonrs ratio, the geometry hardening coefficient of powder sintered material respectively and yield locus of √3J＇2/Y0-J1/Y0 plane was also considered.

关 键 词：塑性泊松比 单轴压缩 屈服模型 金属粉末体材料 

分 类 号：TF12[冶金工程—粉末冶金]