抄録
In most existing solid CAD systems, boundary representation methods, which express three dimensional geometry regions with surrounding surfaces and with their topological connections, are used. The boundary representation data structures give some difficulties to be used in CAE systems, and hardly import physical data from CAE systems. A new CAD system named Volume CAD (V-CAD) using volume data for geometry expression are developed for avoid these problems. V-CAD deals geometrical data with volume unit called cell defined all over the interested region, and each cell has physical data and simplified surface data. To use V-CAD data structure directly in the analysis, the extended finite element method (X-FEM), which can consider a free surface inside analysis element, are developed. In this paper, results of some example models models are compared to theoretical values, and show an ability of X-FEM to use V-CAD data structure directly.
