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Contact Friction Modeling Using a new Node-to-Surface Algorithm

Vafa, Alireza | 2008

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39268 (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. The present research illustrate the finite element modeling of contact between solid bodies, with a special emphasis on the imposing the contact constraints and modification of contact properties on surface in the case of frictional slip. A new approach for both two-dimensional and three-dimensional formulation of contact constraint that allows for a simple and unified treatment of all potential contact scenarios in the presence of large deformations in static case, is presented. The most important outstanding issue in this approach is symmetrical contact stiffness matrix which reduces computational efforts. Based on the observation of numerical results and comparison by experimental models, this approach possesses the ability to resolve complicated contact scenarios efficiently, while being simple to be implemented and wider applicability than the contact formulations available to-date. A simple search algorithm based on the normal and tangential vectors for candidates slave node and relative master is used and updated in each step. The numerical implementation using the finite element and contact constraint rules guarantee the conservation of the total energy law. Both stick and sliding states are investigated between two separated bodies during the solving the problem. The Coulomb friction law is used to simulate the friction between the rigid punch and the work piece by the use of penalty approach
  9. Keywords:
  10. Numerical Modeling ; Large Deformation ; Contact Firction ; Node to Surface Algorithm ; Penalty Constraint

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