Computational Mechanics

, Volume 18, Issue 3, pp 225–235

Continuous meshless approximations for nonconvex bodies by diffraction and transparency

  • D. Organ
  • M. Fleming
  • T. Terry
  • T. Belytschko
Originals

DOI: 10.1007/BF00369940

Cite this article as:
Organ, D., Fleming, M., Terry, T. et al. Computational Mechanics (1996) 18: 225. doi:10.1007/BF00369940

Abstract

Continuous meshless approximations are developed for domains with non-convex boundaries, with emphasis on cracks. Two techniques are developed in the context of the element-free Galerkin method: a transparency method wherein smooth approximations are generated by making boundaries partially transparent, and a diffraction method, where the domain of influence wraps around a concave boundary. They are compared to the original method based on the visibility criterion in which the approximations are discontinuous in the vicinity of nonconvex boundaries. The performance of the methods is compared using two elastostatic examples: an infinite plate with a hole and a crack problem. The continuous approximations show only moderate imporvement in accuracy over the discontinous approximations, but yield significant improvements for enhanced bases, such as crack-tip singular functions.

Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • D. Organ
    • 1
  • M. Fleming
    • 1
  • T. Terry
    • 2
  • T. Belytschko
    • 3
  1. 1.Theoretical and Applied MechanicsNorthwestern UniversityEvanstonUSA
  2. 2.Saturn CorporationPowertrain EngineeringGrand PrairieUSA
  3. 3.Dept. of Civil and Mechanical EngineeringNorthwestern UniversityEvanstonUSA

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