求助高手 分析下error

我将proe画的图形导入ansys中，在筋板之间运用布尔减减去小圆盘模拟表面裂纹，沿45°方向，裂纹已连在一起
我用自由划分网格出现内存不足的错误，我根据提示将图形分成了几部分，然后逐一的划分网格，又出现下面的错误：
*** ERROR *** CP = 12.844 TIME= 21:20:41
Volume 11 cannot be meshed. More than 2 surface elements share a
common element edge. Check keypoint 362 on volume 11.
*** ERROR *** CP = 12.891 TIME= 21:20:53
Volume mesh failure - perhaps due to:
(1) Poorly shaped triangle facets: Mesh surfaces with triangular
elements, modify mesh control to get good triangular mesh, then VMESH
again.
(2) Complex geometry: Subdivide volume and try again.
*** FATAL *** CP = 326.609 TIME= 21:19:34
This model requires more scratch space than available. ANSYS has
currently allocated 586 MB and was not able to allocate enough
additional memory in order to proceed. Please increase the virtual
memory on your system and/or increase the work space memory and rerun
ANSYS. Problem terminated.
我的机子内存是3G多的，硬盘160G。
请高手指点下！！