人工骨支架在骨仿生研究中起重要作用,它不仅能代替缺损骨支撑人体,而且能够引导组织再生、增殖和功能发挥.以有限元形函数映射理论与布尔运算为基础,利用UG二次开发工具UG/Open GRIP,提出了一种仿形精度较高,通用性较强的支架建模方法:首先利用映射法将骨实体模型进行六面体网格划分,然后通过每个六面体的八个节点把规则的单元微结构负型映射得到相应的子单元负型,每个完整的子单元负型进行布尔并运算得到微孔结构负型,即内部微结构模型,最后通过骨实体外形与微结构负型进行布尔差运算获得仿形支架.以人体承力骨为研究对象,研究表明:通过有限元单元的剖分和约束方法,能高效随机地获得更自然的支架模型.%The artificial bone scaffold plays an important part in bionic artificial bone, and it not only provides support for human body, but also guides the regeneration and proliferation of tissues and displays the function. Based on the mapping theory and Boolean operation, a modeling method was put forward with higher profiling accuracy and stronger versatility through the secondary development tools of UG/Open GRIP: firstly, based on the mapping method, the solid model was meshed with the hexahedral mesh; secondly. On the basis of the acquired information of nodes, the unit microstructure was mapped into the irregular and negative microstructure, and then the internal microstructure model was established based on the boolean operation union; at last the scaffold model was gained through boolean subtraction of the internal microstructure model and the solid model. This thesis regards load bearing bone of human body as an object, and the results show that a more natural scaffold model can be achieved efficiently and randomly by using the method.
展开▼
