摘要
采用DEFORM-3D软件,以4种速度对AZ31镁合金棒料的挤压过程进行三维有限元数值模拟,分析金属流动规律及挤压速度对温度场、等效应力场及应变场分布的影响。结果显示:当挤压速度v从1.5 mm/s增至4.5 mm/s时,棒料在稳定挤压状态下的热流通量从-2.7×104(W.m-2)增为1.15×105(W.m-2),其等效应力和应变值呈先增大后减小的趋势;当v=4.5 mm/s时,平均等效应变和应力值最小,分布更趋均匀,表明在挤压比为25,挤压温度为350℃,挤压速度v=4.5mm/s是AZ31镁合金棒料的最佳挤压工艺参数。
The three-dimensional finite element numerical simulation of extrusion forming of AZ31 magnesium alloy bar was ana- lyzed at four extrusion velocities by DEFORM-3D software. The flow pattern and the influence of extrusion velocity for the temperature, the distribution of effective stress and strain of AZ31 magnesium alloy bar was analyzed. The results show that, when the extrusion veloc- ity increases from 1.5 mm/s to 4.5 mm/s, the heat flux of the bar under steady extrusion state will change from - 2.7 ×10^4 （ W ~ m -2 ） to 1.15 ×10^5（ W · m^-2 ）, meanwhile, the effective stress and strain increase at first and then decrease, and the average ef- fective strain and stress value are smallest when v = 4.5 mm/s. It is showed that the extrusion ratio 25 and extrusion temperature 350 ℃ ,and the velocity 4.5 mm/s are the best extrusion technical parameters of AZ31 magnesium alloy.
出处
《济南大学学报（自然科学版）》
CAS
北大核心
2011年第4期344-348,共5页
Journal of University of Jinan(Science and Technology)
基金
山东省高等学校科技计划(J10LD19)
山东省科技发展计划(2010GGX10301)
关键词
AZ31镁合金
挤压变形
有限元分析
应力
应变
AZ31 magnesium alloy
extrusion deformation
finite element analysis
stress
strain
