摘要
薄壁结构的3D打印STL文件是单侧外表面三角面网络,而钢结构模型体系的3D打印数据图形是由STL三角形沿着结构杆件、连接件各表面围成的空间三角面混合包络的集成,这与薄壁三角面网络存在较大差异。STL文件的复杂程度、单元数目都大为增加,也增加了STL三角面与有限元网格融合一体的难度。基于所建立数字图形模型,很容易得到STL的打印数据。为将STL三角面转换为满足有限元计算网格单元,需要预处理、清除、归并奇异点。通过建立结构整体节点编号和坐标体系,并依据STL三角面和法线向量,形成简化的六面体单元,进而形成整体几何矩阵,为生成有限元网格提供了有效方法,并开发了依据转换流程的计算机应用程序。通过计算实例,表明该方法为3D打印数据与有限元计算单元网格融合提供了一条可用的捷径。
The 3 D printed STL file of thin-walled structure is a network of triangular surfaces on one side of the outer surface,while the 3 D printed data graph of the steel structure model system is an integration of the spatial triangular mixed envelope enclosed by STL triangle along the surfaces of structural bars and connecting parts,which are greatly different from each other.With a greater number of elements,STL files are more complex,making it more difficult to integrate STL triangular surface and finite element grid.Based on the established digital graph model,it is easy to get the STL print data.In order to transform STL triangular surface into finite element computing grid element,singular points need to be processed,cleared and merged.The whole node number and coordinate system were established,and based on the STL triangular plane and normal vector,a simplified hexahedron element was formed,thus forming the overall geometric matrix,which could provide an effective method for generating finite element grid.Then a computer application program based on the transformation process was developed.The example showed that the method could provides a shortcut for integration of 3 D printing data and finite element grid.
作者
魏鲁双
刘尚蔚
王颖
魏群
WEI Lushuang;LIU Shangwei;WANG Ying;WEI Qun(Steel Structure and Engineering Research Institute,North China University of Water Resources and Electric Power,Zhengzhou 450045,China;School of Artificial Intelligence,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《钢结构（中英文）》
2019年第12期88-92,共5页
Steel Construction（Chinese & English）
基金
国家科技重大专项经费资助(2016ZX05057)
河南省科技开放合作项目(142106000043)。
