Numerical investigation of crack tip strain localization under cyclic loading in FCC single crystals
| Autor: | Krishna Jonnalagadda, Nipal Deka |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Plasticity Computational Mechanics 02 engineering and technology Ratcheting Fcc Single Crystal Stress (mechanics) 0203 mechanical engineering Composite material Stress intensity factor Fatigue Behavior Cyclic Loading Fields business.industry Isotropy Lüders band Crack tip opening displacement Temperature Infinitesimal strain theory Structural engineering 021001 nanoscience & nanotechnology Deformation Crack Tip Strain Localization T-Stress 020303 mechanical engineering & transports Mechanics of Materials Steel Modeling and Simulation Crystal Plasticity Levy–Mises equations 0210 nano-technology business Copper Constitutive Models |
| Zdroj: | IndraStra Global. |
| ISSN: | 2381-3652 |
| DOI: | 10.1007/s10704-016-0151-5 |
| Popis: | In this work, the crack tip strain localization in a face centered cubic single crystal subject to both monotonic and cyclic loading was investigated. The effect of constraint was implemented using T-stress and strain accumulation was studied for both isotropic and anisotropic elastic cases with the appropriate application of remote displacement fields in plane strain. Modified boundary layer simulations were performed using the crystal plasticity finite element framework. The consideration of elastic anisotropy amplified the effect of constraint level on stress and plastic strain fields near the crack tip indicating the importance of its use in fracture simulations. In addition, to understand the cyclic stress and strain behavior in the vicinity of the crack tip, combined isotropic and kinematic hardening laws were incorporated, and their effect on the evolution of yield curves and plastic strain accumulation were investigated. With zero-tension cyclic load, the evolution of plastic strain and Kirchhoff stress components showed differences in magnitudes between isotropic and anisotropic elastic cases. Furthermore, under cyclic loading, ratcheting was observed along the localized slip bands, which was shown to be affected by T-stress as well as elastic anisotropy. Negative T-stress increased the accumulation of plastic strain with number of cycles, which was further amplified in the case of elastic anisotropy. Finally, in all the cyclic loading simulations, the plastic strain accumulation was higher near the $$55^0 $$ slip band. |
| Databáze: | OpenAIRE |
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