Berlin 2018 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 47: Poster Session II

MM 47.6: Poster

Wednesday, March 14, 2018, 18:30–19:45, Poster C

3D Discrete Dislocation Dynamics simulations of crack-tip plasticity — •Elena Jover Carrasco and Marc C. Fivel — Science and engineering of materials and processes, SIMAP, Univ. Grenoble Alpes / CNRS, BP46, 38402, Saint-Martin d'Hères, France

3D Discrete Dislocation Dynamics (DDD) simulations are conducted in order to better understand the relationship between dislocation activity and crack advances. The final objective is to understand the crack tip processes at a microscopic scale during initiation, propagation and arrest as well as to study the interactions of cracks and microstructure elements such as dislocations and grain boundaries.

The numerical tool used here is the 3D DDD code TRIDIS coupled to the Finite Element code CAST3M used to enforce the boundary conditions, including the presence of the crack. Dislocations can interact with the cracks in two major ways; they can reduce the stress on the crack tips due to the screening phenomena or they can increase the stress as they organize themselves in particular microstructures. The DDD along with the finite element allow to take into account the dislocations contribution on the stress at the crack tip and to observe the behavior of the dislocations near the free surfaces of the crack.