高速压制成形金属粉末的本构关系  

Constitutive Relation of Metal Powder in High-velocity Compaction Formation

作　　者：郑洲顺[1] 岳书霞[1] 郑珊[1] 黄辉[1] 曲选辉[1] 

机构地区：[1]中南大学数学科学与计算技术学院,湖南长沙410083

出　　处：《延边大学学报（自然科学版）》2009年第3期270-273,共4页Journal of Yanbian University（Natural Science Edition）

基　　金：国家重点基础研究发展项目(2006CB605207);湖南省科技计划项目(2007RS4028)

摘　　要：在高速压制成形中,实验证实多次小能量冲击能达到甚至超过单次高能量冲击所获得的密度.本文根据金属粉末在2次高速压制成形中的变形特征,假设预压只发生弹性变形,第2次压制超过金属粉末的屈服强度,发生塑性变形.在ZWT模型基础上,考虑黏塑性及温度引起的应力软化效应,加入损伤因子和黏塑性项,建立了高速压制成形中金属粉末的热黏弹塑性本构关系.In the formation of high-velocity compaction, the experiments have proven that a plurality of lowenergy impacts can achieve or even surpass the density of a single high energy impact. According to the deformation characteristics of the metal powder in two high-velocity compaction and formation, we suppose that the pre-compaction can only result in elastic deformation; the secondary compaction surpasses the yield strength of the metal powder and leads to the plastic deformation. Based on the ZWT models, we estahlishe a hot and adhesive elastoplastic constitutive relation of the metal powder, with the consideration of the softening effect of stress as a result of the viscoplasticity and temperature, and with the addition of the damaging factors and viscoplastic items.

关 键 词：高速压制成形 本构方程 金属粉末 屈服准则 

分 类 号：TF124.3[冶金工程—粉末冶金]