摘要
对金属粉末轧制的成形特点进行分析。基于可压缩连续体力学对金属粉末轧制的有限变形弹塑性本构模型进行推导,并编制了计算模块,利用该模块对铝粉轧制过程进行数值模拟。分析成形区域的特征,结果表明压实区所对应的等效应力、等效应变与相对密度都达到最大值,进入稳定轧制阶段后轧制力趋于平稳。结合对轧制变形的区域划分,根据应力、应变及密度等参数的分布,确定咬入角和中性角的位置。对轧制力和相对密度的实验和模拟结果进行对比分析,表明所提出的理论模型及计算模块稳定可靠。
Characteristics of the metal powder rolling compaction were studied. The finite deformation elasto-plastic constitutive model was derived based on compressible continuum mechanics. The finite element calculating code was processed to make nu-merical simulations for rolling compaction of aluminum powder. Simulation showed that in the compaction area, equivalent stress, equivalent strain and relative density all reached the maximum value. Rolling force was stable ＂during the steady rolling process. According to the partition of the rolling deformation area,the rolling bite angle and neutral angel were determined by simulation results of stress, strain, relative density and other parameters. Comparisons for the rolling force and relative density between exper-iment and simulation proved the reliability of the mechanical models and calculation code derived.
出处
《现代制造工程》
CSCD
北大核心
2012年第11期58-62,共5页
Modern Manufacturing Engineering
基金
深圳市科技计划项目(JC201006020796A)
关键词
粉末轧制
屈服准则
本构模型
数值模拟
rolling compaction
yield criterion
constitutive model
numerical simulation
