Surface Initiated Crack Growth Simulation of Normal Contact Using X-FEM

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Safajuy, Mohsen | 2012

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 43389 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Adibnazari, Saeed
Abstract:
In many mechanical components, contact loading has a major role in stress field analysis. In this thesis, a combination of crack growth simulation and unilateral contact problem was carried out numerically. The Finite Element Method provides a powerful numerical tool to analyze contact problems. In the traditional FEM discontinuities should not cross through elements, so crack will grow through boundaries of elements, therefore, the model should remesh in each step of crack growth in order to align the mesh along the boundaries of discontinuities. This limitation causes major errors and computational costs. To overcome this limitation, the extended Finite Element Method (XFEM) will be used for modeling crack. In this method mesh can be considered independent of crack’s geometry. The discontinuous behavior of displacement - strain fields around the crack face can be imposed via enrichment functions. In this study, Mortar method was used for contact discretization and both Lagrange Multiplier and Penalty methods were studied
Keywords:
Fracture Mechanics ; Contact Mechanics ; Extended Finite Element Method ; Crack Growth