ボクセル解析における境界条件の付与方法(<小特集>ボリュームデータ,ボクセルデータなどに基づくものつくり支援システム)  [in Japanese] Boundary Condition Enforcement in FEM using Voxel(<Special Feature>Computer Aided Design and Production System Based on Voxel or Volume Data Structure)  [in Japanese]

The modeling method using the volume data, which is produced by converting CAD data and CT data directly, has been utilized in various engineering analyses The analysis method based on the finite element method (FEM) in conjunction with "voxel" modeling can be performed to solve structural problems In such a voxel method however, the free surface having complex geometry does not always coincide with the surface of the voxel mesh in general Therefore an appropriate method to impose boundary conditions, which include both essential and natural boundary conditions is required to solve practical problems using the voxel method In this paper the procedure to enforce boundary conditions for the voxel method is described for the stress analysis based on FEM using structured hexahedral finite elements Moreover the numerical results by the structural FEM program, which can utilize the volume data structure of the volume CAD (V-CAD) developed in RIKEN and use the boundary condition treatment procedure stated in this paper, are also demonstrated