关键词: 功能梯度材料, 计算机辅助设计模型, 层厚, 材料分布向量

Abstract: To manufacture functionally graded material parts by rapid prototyping techniques, according to the analysis on the design-based Computer Aided Design (CAD) models of functionally graded material parts in the past, a manufacturing-based CAD model was put forward. In this model, PIC format was used to store slice profiles. Data structure for storing materials information of slices consisted of quad-tree and linear list. The accuracy of materials information could be adjusted and storage space could be optimized. By this model, a new calculating method of materials distribution vector was proposed. Examples proved that the calculation of the materials distribution vector was simple. The percentage λ, which represented the proportion of sampling points not according with the requirements in the total samples, was adopted as a new determination criteria. It was more flexible than those in the past. According to this criteria, a layer thickness caculation method based on materials features was proposed, which was proved to be correct and effective.

Key words: functionally graded material, computer aided design model, layer thickness, materials distribution vector