CUED Publications database

Modeling fatigue crack growth in crystalline solids with discrete dislocation plasticity

Balint, DS and Deshpande, VS and Needleman, A and Van Der Giessen, E (2005) Modeling fatigue crack growth in crystalline solids with discrete dislocation plasticity. 11th International Conference on Fracture 2005, ICF11, 4. pp. 2517-2521.

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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.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:22
Last Modified: 08 Dec 2014 02:33
DOI: