期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
Redesign of a conformal boundary recovery algorithm for 3D Delaunay triangulation 被引量:9
1
作者 CHEN Jian-jun ZHENG Yao 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2006年第12期2031-2042,共12页
Boundary recovery is one of the main obstacles in applying the Delaunay criterion to mesh generation. A stan- dard resolution is to add Steiner points directly at the intersection positions between missing boundaries ... Boundary recovery is one of the main obstacles in applying the Delaunay criterion to mesh generation. A stan- dard resolution is to add Steiner points directly at the intersection positions between missing boundaries and triangulations. We redesign the algorithm with the aid of some new concepts, data structures and operations, which make its implementation routine. Furthermore, all possible intersection cases and their solutions are presented, some of which are seldom discussed in the litera- ture. Finally, numerical results are presented to evaluate the performance of the new algorithm. 展开更多
关键词 boundary recovery Delaunay triangulation Mesh generation Data structure
下载PDF
Un-thorough Delaunay Approach for Tetrahedral Mesh Generation 被引量:1
2
作者 LI Yang FENG Wei ZHOU Hua-min 《Computer Aided Drafting,Design and Manufacturing》 2007年第2期82-90,共9页
An integrated tetrahedrization algorithm in 3D domain which combines the Delaunay tetrahedral method with un-Delaunay tetrahedral method is described. The algorithm was developed by constructing Delaunay Tetrahedrons ... An integrated tetrahedrization algorithm in 3D domain which combines the Delaunay tetrahedral method with un-Delaunay tetrahedral method is described. The algorithm was developed by constructing Delaunay Tetrahedrons from a scattered point set, recovering boundaries using Delaunay and un-Delaunay method, inserting additional nodes in unsuitable tetrahedrons, optimizing tetrahedrons and smoothing the tetrahedral mesh with the 2D-3D Laplacian method. The algorithm has been applied to the injection molding CAE preprocessing. 展开更多
关键词 boundary constraints boundary recovery Delaunay tetrahedrization inserting nodes optimizing tetrahedrons
下载PDF
Effects of Grain Refinement by ECAP on the Deformation Resistance of Al Interpreted in Terms of Boundary-Mediated Processes
3
作者 W.Blum J.Dvorak +2 位作者 P.Kral P.Eisenlohr V.Sklenicka 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2016年第12期1309-1320,共12页
Results of a large set of tensile and compressive creep tests on pure Al were reanalyzed for the influence of low-and high-angle grain boundaries on the deformation resistance at the temperature T = 473 K = 0.51 Tmwhe... Results of a large set of tensile and compressive creep tests on pure Al were reanalyzed for the influence of low-and high-angle grain boundaries on the deformation resistance at the temperature T = 473 K = 0.51 Tmwhere Tm is the melting point.Thermomechanical treatment by equal channel angular pressing followed by heating to T led to strong increase of areal fraction of high-angle boundaries in a structure of subgrains of ≈10^-6m in size,accompanied by significant reduction of subgrain strengthening and of the stress sensitivity of the deformation rate.(Sub)grain strengthening by low-angle boundaries is most effective;the strengthening effect virtually disappears during creep as the boundary spacings coarsen toward their stress-dependent,quasi-stationary size wqs.The same type of coarsening is found for(sub)grain structures with large fraction of high-angle boundaries;in the quasi-stationary state they lead to softening at low and strengthening at high stresses,and a significant increase in tensile fracture strain to values up to 0.8.The results are analogous to former results for Cu and are explained in the same way by the influence of boundaries on storage and recovery of crystal defects and the homogenization of glide. 展开更多
关键词 Deformation Grain boundaries Equal channel angular pressing (ECAP) Creep Dynamic recovery Fine grained microstructure
原文传递
Automatic Mesh Generation on a Regular Background Grid
4
作者 LO S.H 刘剑飞 《Journal of Computer Science & Technology》 SCIE EI CSCD 2002年第6期882-887,共6页
This paper presents an automatic mesh generation procedure on a 2D domain based on a regular background grid. The idea is to devise a robust mesh generation scheme with equal emphasis on quality and efficiency. Instea... This paper presents an automatic mesh generation procedure on a 2D domain based on a regular background grid. The idea is to devise a robust mesh generation scheme with equal emphasis on quality and efficiency. Instead of using a traditional regular rectangular grid, a mesh of equilateral triangles is employed to ensure triangular element of the best quality will be preserved in the interior of the domain. As for the boundary, it is to be generated by a node/segment insertion process. Nodes are inserted into the background mesh one by one following the sequence of the domain boundary. The local structure of the mesh is modified based on the Delaunay criterion with the introduction of each node. Those boundary segments, which are not produced in the phase of node insertion, will be recovered through a systematic element swap process. Two theorems will be presented and proved to set up the theoretical basic of the boundary recovery part. Examples will be presented to demonstrate the robustness and the quality of the mesh generated by the proposed technique. 展开更多
关键词 mesh generation background grid triangular mesh boundary recovery
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部