Non-local plasticity effects on notch fracture mechanics
del Busto, S
Theoretical and Applied Fracture Mechanics
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Martínez-Pañeda, E., del Busto, S., & Betegón, C. (2017). Non-local plasticity effects on notch fracture mechanics. Theoretical and Applied Fracture Mechanics, 92 276-287. https://doi.org/10.1016/j.tafmec.2017.09.007
We investigate the influence of gradient-enhanced dislocation hardening on the mechanics of notch-induced failure. The role of geometrically necessary dislocations (GNDs) in enhancing cracking is assessed by means of a mechanism-based strain gradient plasticity theory. Both stationary and propagating cracks from notch-like defects are investigated through the finite element method. A cohesive zone formulation incorporating monotonic and cyclic damage contributions is employed to address both loading conditions. Computations are performed for a very wide range of length scale parameters and numerous geometries are addressed, covering the main types of notches. Results reveal a strong influence of the plastic strain gradients in all the scenarios considered. Transitional combinations of notch angle, radius and length scale parameter are identified that establish the regimes of GNDs-relevance, laying the foundations for the rational application of gradient plasticity models in damage assessment of notched components.
Strain gradient plasticity, Finite element analysis, Notch, Fracture, Fatigue
The authors gratefully acknowledge financial support from the Ministry of Economy and Competitiveness of Spain through grant MAT2014-58738-C3. E. Martínez-Pañeda also acknowledges financial support from the People Programme (Marie Curie Actions) of the European Union’s Seventh Framework Programme (FP7/2007-2013) under REA grant agreement n° 609405 (COFUNDPostdocDTU).
External DOI: https://doi.org/10.1016/j.tafmec.2017.09.007
This record's URL: https://www.repository.cam.ac.uk/handle/1810/274983
Attribution-NonCommercial-NoDerivatives 4.0 International
Licence URL: http://creativecommons.org/licenses/by-nc-nd/4.0/
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