摘要
研究了平面应变压缩过程中摩擦对金属流变规律以及力能参数的影响.通过有限元软件MSC/Superform,采用二维以及三维热力耦合有限元理论对不同摩擦条件下的力能参数、宽展情况以及变形金属的流动情况进行了分析;在自主研制的大试样平面应变热模拟试验机上,利用室温下工业纯铝探讨了上下接触面摩擦不一致时金属流动的规律.结果显示:随着摩擦的增大,变形负载将增大,宽展减小;当上下接触面间摩擦条件不同时,变形后的试样将出现"U"字型,而且随着上下接触面之间摩擦差值的增大,其变形不均将更加严重.
The effects of friction on metallic rheology and mechanical parameters during plane strain compression were studied. Based on the 2-D and 3-D thermo-mechanical coupled finite element theory, the mechanical parameters, lateral spread and deformed metal flow pattern were calculated in different friction conditions by using MSC/Superform finite element software. The metallic deformation law was analyzed with pure aluminium at room temperature on a self-developed large specimen plane strain thermomechanical simulator under different friction conditions at top and bottom interfaces. The results show that the deformation load enhances and the lateral spread lessens with increasing friction coefficient. The difference in friction coefficient at top and bottom interfaces results in U-type deformed specimens, and the inhomogeneity of deformation is more severe when the difference between top and bottom friction coefficients increases.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2008年第11期1266-1269,1281,共5页
Journal of University of Science and Technology Beijing
基金
教育部211工程重点资助项目"物理模拟系统--平面应变热模拟试验机的研究"
关键词
平面应变压缩
大试样平面应变
摩擦
宽展
不均匀变形
plane strain compression
large specimen plane strain
friction
lateral spread
inhomogeneous deformation
