Rotary bending fatigue analysis of shape memory alloys
| Autor: | Luc Saint-Sulpice, Maede Hesami, Mahmoud Kadkhodaei, Shabnam Arbab Chirani, Laurent Pino, Sylvain Calloch, Vincent Legrand |
|---|---|
| Přispěvatelé: | Isfahan University of Technology, Institut de Recherche Dupuy de Lôme (IRDL), Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Université de Bretagne Sud (UBS), Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Université de Brest (UBO)-Université de Bretagne Sud (UBS) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Work (thermodynamics)
Materials science Constitutive equation Physics::Medical Physics 02 engineering and technology Shape memory alloy [SPI.MAT]Engineering Sciences [physics]/Materials Computer Science::Robotics [SPI]Engineering Sciences [physics] 0203 mechanical engineering General Materials Science Stabilized dissipated energy Fatigue business.industry Mechanical Engineering Stress–strain curve Bending fatigue Structural engineering Shape-memory alloy 021001 nanoscience & nanotechnology Phase diagram 020303 mechanical engineering & transports 0210 nano-technology business Rotary bending Beam (structure) |
| Zdroj: | Journal of Intelligent Material Systems and Structures Journal of Intelligent Material Systems and Structures, SAGE Publications, 2018, 29 (6), pp.1183-1195. ⟨10.1177/1045389X17730923⟩ |
| ISSN: | 1045-389X 1530-8138 |
| DOI: | 10.1177/1045389X17730923⟩ |
| Popis: | International audience; In this work, a one-dimensional constitutive model is used to study rotary bending fatigue in shape memory alloy beams. The stress and strain distributions in a beam section are driven numerically for both pure bending and rotary bending to show the basic differences between these two loading types. In order to verify the numerical results, experiments are performed on NiTi specimens with an imposed bending angle using a bending apparatus. Since the specimens show significant stress plateau for forward and backward transformation in their stress–strain response, an enhanced stress–temperature phase diagram is proposed in which different slopes are considered for the start and finish of each transformation strip. In order to study low cycle fatigue of shape memory alloys during rotary bending, the stabilized dissipated energy is calculated from numerical solution. A power law for variations of the fatigue life with the stabilized dissipated energy is obtained for the studied specimens to predict their fatigue life. The numerical predictions of the present approach are shown to be in a good agreement with the experimental findings for rotary bending fatigue. Uniaxial tensile fatigue tests are further performed on the studied specimens to investigate effect of loading type on the fatigue lifetime. |
| Databáze: | OpenAIRE |
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