Abstract: To distinguish the small features from the large ones is the key technology of geometric simplification, which is one of the major subtasks under abstraction of model for FEA. Filleting radius, which is called filletization, has the effect of low-pass filtering to geometric shape. The locality of boundary entities can be evaluated by comparing the original model with the filleted model. The principle to quantify the detail – level of boundary geometric entities based on filletization is described in detail and an approach to decompose geometric object into detail features is developed. In the cycle of detailed boundary entitles recognition and detail feature decomposition, an arbitrary solid model which is represented as B – Rep model can be simplified to any level. The method proposed in this paper can be used as an efficient tool of abstracting geometric model for analysis from CAD model.

Key words: Analysis automation, Detail removal, Feature recognition/decomposition