Modeling fatigue crack growth in crystalline solids with discrete dislocation plasticity Conference Paper uri icon

abstract

  • Analyses of crack growth under cyclic loading conditions are discussed where plastic flow arises from the motion of large numbers of discrete dislocations and the fracture properties are embedded in a cohesive surface constitutive relation. The formulation is the same as used to analyse crack growth under monotonic loading conditions, differing only in the remote loading being a cyclic function of time. Fatigue, i.e. crack growth in cyclic loading at a driving force for which the crack would have arrested under monotonic loading, emerges in the simulations as a consequence of the evolution of internal stresses associated with the irreversibility of the dislocation motion. A fatigue threshold, Paris law behaviour, striations, the accelerated growth of short cracks and the scaling with material properties are outcomes of the calculations. Results for single crystals and polycrystals will be discussed.

published proceedings

  • 11th International Conference on Fracture 2005, ICF11

author list (cited authors)

  • Balint, D. S., Deshpande, V. S., Needleman, A., & Van Der Giessen, E.

complete list of authors

  • Balint, DS||Deshpande, VS||Needleman, A||Van Der Giessen, E

publication date

  • December 2005