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Application of Isogeometric Method in Modeling and Analyzing Crack Growth Problems

Esmaeili, Mir Sardar | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 43489 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Khoei, Amir Reza
  7. Abstract:
  8. Isogeometric Analysis method is a newly introduced method for the analysis of problems governed by partial differential equations. The method has some features in common with the finite element method and some in common with the mesh-less methods. This method uses the Non-Uniform Rational B-Splines (NURBS) functions as basis function for analysis. With this basis functions, the refinement procedure is much easier than the classical finite element method by eliminating the need to communicate with the CAD model. Modeling cracks in classical finite element method requires very fine mesh near the crack tip. One can model crack propagation by means of classical finite element, using an updating mesh procedure which is a time consuming task. This is why eXtended Finite Element Method (X-FEM) is introduced. Using this method, no updating for mesh during crack propagation is required. The X-FEM adds some terms into shape function of elements which somehow are involved with crack. This idea is used in this thesis to model the crack and crack propagation. Due to the nature of NURBS function, the precision of calculations is upgraded in comparison with the classical Lagrange shape function and thus, fewer degrees of freedom can be used in order to obtain the desired precision which results in a significant decrease in costs. In the upcoming chapters, the details in modeling, enrichment procedure and crack propagation are presented, and results have a good agreement with those available in the literature
  9. Keywords:
  10. Fracture Mechanics ; Crack Growth ; Extended Finite Element Method ; Non-Uniform Rational B-Splines (NURBS)Functions ; B-Spline ; Isogeometric Method ; T-Splines

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