等径侧向挤压变形均匀程度的有限元分析  

Finite element analysis of deformation uniformity of equal cross section lateral extrusion

作　　者：郝南海[1] 王全聪[1] 

机构地区：[1]太原重型机械学院机械工程系,太原030024

出　　处：《中国有色金属学报》2001年第z2期230-233,共4页The Chinese Journal of Nonferrous Metals

基　　金：山西省青年科学基金资助项目 (9810 2 7)

摘　　要：等径侧向挤压是实现材料纯剪切变形的有效方法 ,通过循环挤压可实现塑性大变形的S型等径侧向挤压被应用于制备细晶材料。利用刚塑性有限元法分析了摩擦对挤压件变形均匀程度的影响 ,以不同摩擦因子与不同侧向角的组合为分析对象 ,摩擦因子取值范围为 0 .1～ 1.0 ,侧向角取值范围为 10°～ 90°。分析结果表明 ,摩擦因子越大 ,塑性变形越不均匀。定义了反映挤压件变形均匀程度的变形均匀系数 ,根据计算结果建立了挤压件变形均匀系数与摩擦因子的关系曲线 ,曲线可作为制订等径侧向挤压工艺参数的依据。Equal cross section lateral extrusion (ECSLE) is an effective method realizing pure shear deformation. The S type ECSLE, which could realize severe plastic strain through repetitive deformation, has been adopted in producing ultra fine grained materials. The influence of friction on the deformation uniformity of S type ECSLE was investigated with rigid plastic finite element method. The FEM analysis was conducted with the combination of different friction factor and different lateral angle. The value of friction factor for analysis varies from 0.1 to 1.0 and the lateral angle varies from 10° to 90°. The result shows that, the higher the friction factor, the more the uneven plastic deformation resulted in extruded workpiece. A deformation uniformity factor was defined to measure the deformation uniformity of extruded workpiece. The relation curve of deformation uniformity factor vs. friction factor was drawn based on the analysis result and the curve can be used as a basis of S type ECSLE process design.

关 键 词：等径侧向挤压 应变 有限元法 

分 类 号：TG371[金属学及工艺—金属压力加工]