低频脉冲振动条件下金属成形的体积效应分析  

Volume effect analysis of metal deformation with low-frequency pulse vibration

作　　者：蔡改贫[1] 刘峥[1] 张晖[1] 

机构地区：[1]江西理工大学机电学院,江西赣州341000

出　　处：《锻压技术》2008年第5期155-159,共5页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(50665003);江西省研究生创新基金项目(YC07A077)

摘　　要：将一定频率和振幅的脉冲振动信号施加到金属成形系统中,并对脉冲振动信号进行傅立叶变换,建立了振动拉伸的一维弹塑性本构模型和粘弹塑性本构模型。在计算瞬时应变的大小与屈服极限的基础上建立判断准则,并利用MATLAB对本构方程进行求解,从而确定了脉冲振动拉伸在材料变形时的动态应力和平均应力。按照所给定的振型参数和材料机械性能参数,结合特定的脉冲振动拉伸实例,分别绘制了两种模型的动态应力-时间曲线、动态应力-应变曲线和平均应力-应变率曲线。实验分析表明,在低频振动作用下,金属材料变形可以按照粘弹塑性模型来描述,且实验结果与理论计算结果比较一致,从而实现低频脉冲振动塑性成形粘弹塑性模型和弹塑性模型的体积效应分析。The pulse vibration with a certain frequence and amplitude was given to a metal deformation system, and the pulse vibration signal was transformed hy Fourier method, one demension elasticity-plasticity constructive model and a visco-elasticity plasticity constructive model were built for vibration drawing. On the base of the instantaneous strain and yield limit calculated, some judgement rules about visco-elastic deformation and visco-plastic deformation were established, after the construction equation resolved by MATLAB, dynamic stress and average stress of material drawing deformation with pulse vibration were obtained. With some vibration parameters and mechanical performance parame- ters given and pulse vibration drawing example, the dynamic stress-time curve, dynamic stress-strain curve and average stress strain curve of the two construction models were protracted, It is shown form experiment that metal material deormation can described by visco-elasticity plasticity constructive model with a low frequeney pulse vibration, and experimental result is consistent with the theoretical result, then volume effect analysis of the lasticity-plasticity model and a visco-elasticity elasticity model with a low frequency pulse vibration.

关 键 词：低频脉冲振动 塑性成形 粘弹塑性 弹塑性 体积效应 

分 类 号：TG301[金属学及工艺—金属压力加工]