在RP领域,传统的三维几何实体表示方法只能包含实体模型的几何信息,不能包含相应的任何材料信息,因此,不能应用于多材料零件的建造。为实现多材料零件的建造,迫切需要一种新的更有效的并能表示多材料零件几何信息与材料信息的实体模型表示方法。为此,提出一种新的面向制造的基于材料边界的多材料实体表示算法,该算法采用材料ID索引与材料区域标记相结合的方法表示多材料实体零件的几何属性与材料属性,实例仿真分析验证了该算法可以表示复合材料实体零件、功能梯度材料零件以及具有较为复杂多材料属性的多相理想材料实体零件,并且实体表面轮廓复杂度以及材料种类对该算法没有影响,理论上可以表示任意复杂的多材料实体零件。
In rapid prototyping (RP) field, the traditional representation methods for 3-D solid model contain only geometric information, without any corresponding materials information; Therefore, it cannot be applied to built multi-material parts. For multi-material parts fabrication, a new and more efficient representation method must be proposed, that contains both geometric information and material information of multi-material solid model. To fabricate multi-material parts, a new representation algorithm based on material boundary in manufacturing processing is presented, which combines material ID index method and material region flags method to represent the geometric information and material information for multi-material parts. Some cases verify that the proposed representation method can be used to represent the multi-material parts whose components are composite material (CM) or functionally graded materials(FGM) or their combination, and it is not affected by surface complexity and material categories; Theoretically, the method can represent any multi-material part with arbitrary surface complexity and material categories.