VPF用粘性介质粘弹塑性本构模型及参数确定  

Visco-elastoplastic constitutive model for viscous medium used in VPF and its parameters determination

作　　者：刘建光[1] 王忠金[1] 刘岩[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《材料科学与工艺》2010年第6期843-846,共4页Materials Science and Technology

基　　金：国家自然科学基金资助项目(50275035)

摘　　要：为确定粘性介质压力成形所采用的粘性传力介质的材料模型及其参数,对粘性介质剪切蠕变-回复实验结果进行分析,提出采用粘弹塑性材料模型描述粘性介质变形行为.将粘性介质的总变形分解为弹性分量、粘弹性分量和粘塑性分量,对实验结果进行拟合分析,分别确定了粘性介质变形的各个应变分量与应力之间的关系,最终建立了所选用的粘性介质粘弹塑性模型,为数值模拟粘性介质变形行为提供了依据.Viscous pressure forming（VPF） is one kind of sheet flexible-die forming processes and its intrinsic characteristic is the coupled deformation process of sheet metal and viscous medium.In our paper,first,the experimental results of creep-recovery tests are analyzed to determine the material model of viscous medium used in VPF and to identify the material parameters,and then the model is utilized to describe the deformation behavior of viscous medium.The total strain is divided into three components,viz.elastic strain,viscoelastic strain and viscoplastic strain,and the relationship between strain and stress is determined by fitting experimental curves.Finally,a visco-elastoplastic constitute model of viscous medium is built up,which provides the fundament for the numerical simulation of VPF

关 键 词：粘性介质压力成形 粘性介质 粘弹塑性模型 材料参数 

分 类 号：TG386[金属学及工艺—金属压力加工]