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Experimental and Numerical Study of a Shape Memory Alloy Wire Rope Behavior in Release Mechanism

Malekian, Ali | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46426 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Naghdabadi, Reza; Arghavani Hadi, Jamal
  7. Abstract:
  8. Smart materials are able to change their physical properties under various environmental conditions. Shape memory alloys (SMA) are relatively new smart materials that can respond to environmental stimuli e.g., heat, electricity, etc. Unique behaviors of SMAs, called shape memory effect and superelasticity, have motivated many applications in various fields of study (aerospace, medical, civil engineering, etc.). Although the behavior of SMAs is complicated, modeling and utilizing these materials have been receiving much attention in the past 20 years. Since a cable tolerate more tension than a wire or rod, the shape memory alloy cables could have a broad range of potential applications. Cables (or wire ropes) made
    from SMA wires are relatively novel and unexplored structural elements that incorporate many benefits of cables, besides the advantages of shape memory effect and superelasticity of SMAs. Also, they can achieve large force and large displacement in a remarkably small space. The purpose of this work is to characterize the shape memory effect of SMA cables.This characterization will be done by numerical and experimental study and the SMA cable is
    employed in a release mechanism.
    For this purpose, in this research the theory of wire rope and SMAs is studied separately at first. A numerical and experimental study is used to characterize the shape memory behavior of SMA cables. Also, a release mechanism is designed and made from SMA cable. The mechanism demonstrated the shape memory effect of the cable. The cable was stretched and locked in a clamp to utilize its recovery force by increasing temperature. The cable showed
    considerable recovery force which broke the pin. Then, the recovery force of the cable was measured with another setup. Moreover, the numerical study was utilized to model the cable in the release mechanism and predict the force that the cable can produce by recovery. The results showed acceptable match between numerical and experimental results. Besides, the effects of geometry, properties of SMA and length of cable on SMA cable was studied.
    Finally the release mechanism of Split Hopkinson tension bar was designed with SMA cable which can be one of its application
  9. Keywords:
  10. Smart Materials ; Shape Memory Alloy ; Cables ; Release Mechanism ; Shape Memory Effect

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