摘要
应用快速拉格朗日元法(FLAC)模拟了金属平面应变镦粗问题。锻件的高宽比为1。利用改变锻件两端的边界条件,模拟了锻件受摩擦力和不受摩擦力的两种情形。研究发现,当不存在摩擦力时,锻件的剪切应变分布是非常均匀的,不出现剪切带。当存在摩擦力时,锻件的剪切应变分布是非常不均匀的,出现了X型剪切带。在相同的压下量时,存在摩擦力时的最大剪切应变增量是不存在摩擦力时的4倍。
FLAC is used to model the problem of plane strain upsetting of metal specimens. The ratio of height to width of the specimens is 1. The specimens subjected to friction force and without friction force are modeled respectively through assigning the different boundary conditions at the specimen ends. It is found from the present numerical results that at smooth ends the shear strain increment distribution within the specimen is very uniform and no shear bands are observed. At rough ends, the shear strain increment distribution is very non-uniform and the X- type shear bands can be found. At the same axial deformation, the maximum shear strain increment at rough ends is four times that at smooth ends.
出处
《科学技术与工程》
2008年第8期2208-2211,共4页
Science Technology and Engineering
基金
辽宁工程技术大学第五批教改主项(B类)资助
关键词
镦粗
剪切带
摩擦力
FLAC
upsetting shear band friction force FLAC
