The influence of stress ratio on fatigue lifetime of NiTi shape memory alloy
| Autor: | Petro Yasniy, Volodymyr Iasnii |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Strain (chemistry) Stress ratio Elastic energy 02 engineering and technology Shape-memory alloy Dissipation 021001 nanoscience & nanotechnology Stress (mechanics) 020303 mechanical engineering & transports 0203 mechanical engineering Nickel titanium Energy density Composite material 0210 nano-technology Earth-Surface Processes |
| Zdroj: | Procedia Structural Integrity. 28:1551-1558 |
| ISSN: | 2452-3216 |
| DOI: | 10.1016/j.prostr.2020.10.127 |
| Popis: | The influence of stress ratio on fatigue lifetime of pseudoelastic NiTi alloy are studied. The stress-, strain- and energy-based criteria were used for analysis under on low-cycle fatigue. Increasing the stress ratio from 0 to 0.5 significantly reduces the fatigue life of the NiTi alloy when used to describe the stress range, strain range and dissipation energy density and increases when using the Odqvist’s parameter. A good agreement between experimental and calculated values of predicted lifetime was obtained. The low–cycle fatigue failure criterion of pseudoelastic NiTi alloy - total elastic strain energy density that takes into account the stress ratio was proposed. |
| Databáze: | OpenAIRE |
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