Journal of the Korean Institute of Intelligent Systems (한국지능시스템학회논문지)

Korean Institute of Intelligent Systems (한국지능시스템학회)
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Stress Intensity Factor Analysis System for 3D Cracks Using Fuzzy Mesh

퍼지메쉬를 이용한 3차원 균열에 대한 응력확대계수 해석 시스템

  • 이준성 (경기대학교 기계시스템디자인공학부) ;
  • 이은철 (경기대학교 대학원 기계공학과) ;
  • 최윤종 (경기대학교 대학원 기계공학과) ;
  • 이양창 (대림대학 산학협력팀)
  • Published : 2008.02.25
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Abstract

Integrating a 3D solid modeler with a general purpose FEM code, an automatic stress intensity factor analysis system of the 3D crack problems has been developed. A geometry model, i.e. a solid containing one or several 3D cracks is defined. Several distributions of local node density are chosen, and then automatically superposed on one another over the geometry model by using the fuzzy knowledge processing. Nodes are generated and quadratic tetrahedral solid elements are generated by the Delaunay triangulation techniques. Finally, the complete finite element(FE) model generated, and a stress analysis is performed. This paper describes the methodologies to realize such functions, and demonstrates the validity of the present system.

상용화된 FEM 코드와 3차원 솔리드 모델러를 통합하여 3차원 균열에 대한 자동 응력확대계수 해석 시스템을 개발하였다. 하나 또는 몇 개의 3차원 균열을 포함하는 기하학적 모델을 정의한다. 시스템에 저장된 몇 개의 절점패턴을 선택하면 자동적으로 퍼지지식 처리기법을 이용한 기하학적 모델 전 영역에 절점들이 중첩되어진다. 절점들은 생성되어지고 데로우니삼각화 법에 의한 사면체 솔리드요소가 생성되어진다. 최종적으로 완전한 유한요소 모델이 생성되어져 응력해석을 수행하게 된다. 본 논문은 몇몇 함수들을 실현시키기 위한 방법론에 대해 묘사하고 있으며 시스템의 타당성을 제시하였다.

Keywords

References

  1. Irwin, G. R., "Introduction for Part-Through Crack Fatigue Life Prediction," ASTM 687, pp. 11-12, 1999
  2. Schroeder, W.J. and Shephard, M.S., "Combined Octree/ Delaunay Method for Fully Automatic 3-D Mesh Generation," International Journal for Numerical Methods in Engineering, Vol. 29, pp. 37-55, 1990 https://doi.org/10.1002/nme.1620290105
  3. Pourazady, M. and Radhakrishnan, M., "Optimization of a Triangular Mesh," Computers and Structures, Vol. 40, No. 3, pp. 795-804, 1991 https://doi.org/10.1016/0045-7949(91)90246-I
  4. Buratynski, E. K., "Fully Automatic Three- Dimensional Mesh Generator for Complex Geometries," International Journal for Numerical Methods in Engineering, Vol. 30, pp. 931-952, 1990
  5. Shephard, M. S. and Georges, M. K., "Automatic Three-Dimensional Mesh Generation by the Finite Octree Technique," International Journal for Numerical Methods in Engineering, Vol. 32, pp. 709-749, 1991 https://doi.org/10.1002/nme.1620320406
  6. Sugioka, K., Lee, J. S., Yoshimura, S. and Yagawa, G., "A Probabilistic Fracture Mechanics Analysis of Multiple Surface Cracks Considering their Interaction Effects," Proceedings of the '94 Annual Meeting of JSME/MMD, No. 940-37, pp. 257-258, 1994
  7. Yoshimura, S., Lee, J. S. and Yagawa, G., "FEM Modeler for 3D Solid Geometry with Free-Form Surface: Automatic Attachment of Boundary Conditions to 3D Mesh," The 6th Computational Mechanics Conference, No. 930-71, pp. 505-506, 1993
  8. Chiyokura, H., "Solid Modeling : Theory and Implementation," Addition -Wesley, 1988
  9. Lee, J. S., "Automated CAE System for Three- Dimensional Complex Geometry," The Doctoral Thesis, The University of Tokyo, 1995
  10. Asano, T., "Practical Use of Bucketing Techniques in Computational Geometry," Computational Geometry, North-Holland, pp. 153-195, 1985
  11. Watson, D. F., "Computing the n-Dimensional Delaunay Tessellation with Application to Voronoi Polytopes," The Computer Journal, Vol. 24, pp. 162-172, 1991 https://doi.org/10.1093/comjnl/24.2.162
  12. Cavendish, J. C., "Automatic Triangulation of Arbitrary Planar Domains for the Finite Element Method," International Journal of Numerical Methods in Engineering, Vol. 8, pp. 679-696, 1974 https://doi.org/10.1002/nme.1620080402
  13. Hibbit, Karlsson & Sorensen, Inc., "ABAQUS User's Manual," 2007
  14. Newman, J. C. and Raju, I. S., "An Empirical Stress-Intensity Factor Equation for the Surface Crack," Engineering Fracture Mechanics, Vol. 15, pp. 185-192, 1981 https://doi.org/10.1016/0013-7944(81)90116-8