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• W4384832157 endingPage "105383" @default.
• W4384832157 startingPage "105383" @default.
• W4384832157 abstract "Microplasticity, a behavior lies between elasticity and macroplasticity, is not only closely related to the origin of plasticity in crystalline materials, but also profoundly affects the service life of materials under small deformation, e.g., high cycle fatigue. Here a constitutive framework considering the micro- and macroplasticity is established for modelling the elastic–plastic transition of metallic materials. It reveals the origin of macro-yielding as the instability of microplasticity and demonstrates the intrinsic features of the macro-yield point, such as dislocation density dependence and offset strain. The microplastic strain is formulated according to short-range dislocation motion, which arises from the dislocation network reconfiguration and dislocation pile-up against grain boundaries in terms of characteristic length scales. It is further integrated into the crystal plasticity model to account for grain anisotropy. The present framework is applied to study the mechanical behaviors of lath martensitic steels under different loading modes, temperatures, and irradiation effects. The microplasticity is analyzed from various perspectives, including the microstructural sensitivity, effect on macro-yielding, and active slip systems involved. The cyclic softening behavior is also captured, and in particular the irradiated case exhibits the transition from nearly perfect elastic to elastoplastic cycling at 0.3% strain amplitude, consistent with the reported experimental results. This framework provides a quantitative understanding of microplasticity in crystalline materials, sheds light on the mechanisms underlying elastic–plastic transitions, and has potential to inform predictions of material damage and lifetime." @default.
• W4384832157 created "2023-07-21" @default.
• W4384832157 creator A5010470337 @default.
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• W4384832157 creator A5086786598 @default.
• W4384832157 date "2023-10-01" @default.
• W4384832157 modified "2023-10-16" @default.
• W4384832157 title "A constitutive framework for micro-to-macroplasticity of crystalline materials under monotonic and cyclic deformation" @default.
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• W4384832157 doi "https://doi.org/10.1016/j.jmps.2023.105383" @default.
• W4384832157 hasPublicationYear "2023" @default.
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