中文摘要：

采用基于Navier-Stokes运动方程开发的Moldflow MPI 6．0软件，以聚甲基丙烯酸甲酯（PMMA）材料为对象，在型腔压力为100MPa、熔体温度为250℃、不同模具温度下，研究零件几何特征（微结构所在位置、微结构形状、微结构截面尺寸、微结构深宽比和微结构型腔截面尺寸）对微结构充填深度的影响。研究结果表明：微结构与型腔末端间距越小，充填越深，但当微结构与型腔末端间距超过某一值时，微结构充填深度与其位置无关；微结构倾角越小，充填越深；微结构截面尺寸越大，充填时熔体所受阻力越小，充填越深；型腔截面尺寸与微结构尺寸相差越小，越有利于微结构充填；微结构充填深度与其深宽比无关。

英文摘要：

With Moldflow MPI 6.0 software based on Navier-Stokes momentum equation for PMMA material, the influences of geometry characters of a part, such as micro structures＇ position, shape, section dimension, aspect ratio and cavity＇ width, on the filling length of micro structures were investigated under the cavity pressure 100 MPa, and at melt temperature 250℃ with different mold temperatures. The results show that the distance between microstructure and cavity terminal is smaller, the filling is longer, but when the distance surpasses one value, the filling length has nothing to do with the position of the microstructure. The smaller the microstructure inclination angle, the longer the filling. The bigger the size of microstructure section, the smaller the resistance of the melts in filling, and the longer the filling. The difference between the size of the cavity section and the size of the microstructure is less, the filling is more advantageous, but the filling length of microstructure has nothing to do with the high aspect ratio.