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Smart Structures and Systems Volume 2, Number 4, October 2006 , pages 357-363 DOI: https://doi.org/10.12989/sss.2006.2.4.357 |
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An approach for modelling fracture of shape memory alloy parts |
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Margarita E. Evard, Alexander E. Volkov and Olga V. Bobeleva
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| Abstract | ||
| 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. | ||
| Key Words | ||
| shape memory alloys; modeling; fracture; cyclic loading, thermocycling. | ||
| Address | ||
| Research Institute of Mathematics and Mechanics, Saint-Petersburg State University, Universitetski pr., 28, Stary Petergof, 198504, St-Petersburg, Russia | ||