摘要
在充分考虑半固态AlSi7Mg合金触变充型过程中压力和速度变化特征基础上 ,建立耦合半固态表观粘度的三维流场数学模型 ,确定固定流量的入流边界条件和约束滑动型壁边界条件以及保持入流温度不变的初始条件 ,并采用SOLA VOF法对铝合金件的触变充型过程进行了模拟计算。结果表明 ,由于半固态表观粘度随剪切速率增大而下降 ,造成局部浆料充型速度的复杂变化 ,从而使半固态合金呈现剪切变稀的触变成形特点。由于充型时间极短 ,浆料在充型过程中降温小于 1℃。
Based on the behavior characters of pressure and flow velocity during semi solid AlSi7Mg slurry filling processes, a three dimensional model of slurry flow coupled with apparent viscosity was established. The filling simulation of the semi solid forming process for semi solid aluminum casting was investigated with the help of the SOLA VOF algorithm. And fixed volume of flow and sliding along wall were used for boundary conditions, slurry temperature was used for initiation condition. Results demonstrate that apparent viscosity decreases with the increase of shear rate, semi solid alloy shows that shearing thinning thixotropy and its temperature differential is below 1℃ in the course of the filling.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2003年第1期35-39,共5页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目 (5 9995 44 0 )
教育部博士点基金资助项目 (19980 0 0 80 7)
