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An approach for modelling fracture of shape memory alloy parts
Margarita E. Evard,Alexander E. Volkov,Olga V. Bobeleva 국제구조공학회 2006 Smart Structures and Systems, An International Jou Vol.2 No.4
Equations describing deformation defects, damage accumulation, and fracture condition have been suggested. Analytical and numerical solutions have been obtained for defects produced by a shear in a fixed direction. Under cyclic loading the number of cycles to failure well fits the empirical Koffin-Manson law. The developed model is expanded to the case of the micro-plastic deformation, which accompanies martensite accommodation in shape memory alloys. Damage of a shape memory specimen has been calculated for two regimes of loading: a constant stress and cyclic variation of temperature across the interval of martensitic transformations, and at a constant temperature corresponding to the pseudoelastic state and cyclic variation of stress. The obtained results are in a good qualitative agreement with available experimental data.
Effect of plastic deformation on the martensitic transformations in TiNi alloy
Margarita E. Evard,Fedor S. Belyaev,Aleksandr E. Volkov 국제구조공학회 2022 Smart Structures and Systems, An International Jou Vol.29 No.2
A model of plastic deformation of the shape memory alloys which describes dislocation slip at the microlevel is developed. A condition similar to the Schmid law was adopted for the determination of dislocation slip onset. A description of the interaction of plastic deformation and martensitic transformations by taking into account the densities of deformation defects is proposed. It is shown that the model can correctly describe the effect of plastic strain on the shape memory effect. The proposed model is also capable of describing the two-way shape memory effect.
An approach for modelling fracture of shape memory alloy parts
Evard, Margarita E.,Volkov, Alexander E.,Bobeleva, Olga V. Techno-Press 2006 Smart Structures and Systems, An International Jou Vol.2 No.4
Equations describing deformation defects, damage accumulation, and fracture condition have been suggested. Analytical and numerical solutions have been obtained for defects produced by a shear in a fixed direction. Under cyclic loading the number of cycles to failure well fits the empirical Koffin-Manson law. The developed model is expanded to the case of the micro-plastic deformation, which accompanies martensite accommodation in shape memory alloys. Damage of a shape memory specimen has been calculated for two regimes of loading: a constant stress and cyclic variation of temperature across the interval of martensitic transformations, and at a constant temperature corresponding to the pseudoelastic state and cyclic variation of stress. The obtained results are in a good qualitative agreement with available experimental data.
Modeling of vibration protection by shape memory alloy parts with an account of latent heat
Margarita E. Evard,Fedor S. Belyaev,Aleksandr E. Volkov,Maria S. Starodubova 국제구조공학회 2024 Smart Structures and Systems, An International Jou Vol.33 No.3
Modeling of vibrations of a rotating pendulum with working shape memory alloy rod has been performed in the frames of a microstructural model taking into account the latent heat release, absorption and the heat exchange during direct and reverse martensitic transformation. It has been shown that the influence of the latent heat, the rate of preliminary deviation of the pendulum from the equilibrium, the rate of heating and cooling can have a significant impact on the vibrations and damping characteristics of the system.