ECAP过程压头压力的分析——试验与模拟  

Analysis of pressure head during the process of equal channel angular pressing:experiment and simulation

作　　者：张静[1] 张克实[1] 许凌波[1] 袁秋平[1] 

机构地区：[1]广西大学,南宁530004

出　　处：《应用力学学报》2011年第5期502-508,556,共7页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(90815001);广西自然科学基金(桂科自0832024);广西大学科学基金

摘　　要：结合试验与数值模拟探讨了等通道转角挤压(Equal Channel Angular Pressing,简称ECAP)过程中影响压头压力的主要因素。通过试验考察了A、Ba、Bc、C等四种挤压路径下压头压力测试的统计平均分布特征和大小、挤压速度对于压头压力的影响、其它影响压头压力的因素;试验结果显示了不同路径、不同挤压道次对压头压力大小的影响及压力值的显著差别。另外,针对等通道转角挤压过程中模具的转角角度、转角半径、模具与挤压试样之间的摩擦条件等因素与压头中压力的关系,采用有限元方法进行了大应变数值模拟。模拟结果显示:较小的模具转角、较大的转角曲率、粗糙的接触表面会显著增加压头中压力;试验与模拟研究可为ECAP过程及类似加工过程的力学分析提供参考。The main factors about the pressure head during the process of equal-channel angular pressing(ECAP) are investigated by experiments and numerical simulation.The statistical average distribution characteristics of pressure head’s force in experiment are studied under the conditions of different extrusion paths and the influence of extrusion speed.The relation between force of pressure head and mould design parameters,including the corner angle,corner radius and friction conditions between mould’s inner wall and extrusion specimen under large strain are analyzed by numerical simulation of large strain.The results indicate that the smaller mould corner,the bigger angular corner radius and rough contact surface remarkably increase the force of the pressure head.

关 键 词：ECAP 压头压力 数值模拟 纯铜 挤压路径 模具 

分 类 号：O344.3[理学—固体力学] TG76[理学—力学]