Systematic study is conducted on variation regularity for stress-strain curve, feature points stress, dissipated energy, equivalent damping ratio of shape memory alloy (SMA)wires changed with diameter of wires, strain amplitude and loading cyclic number. The results show: increase of SMA wires diameter can degrade the mechanical properties of SMA wires; SMA wires can have good and stable hysteretic performance when the strain amplitude is 6% and the loading cyclic number is 15. Utilizing the superelasticity of SMA and combining operating principle of the tuned mass damper, a kind of SMA suspension pendulum damping system ,which is easy to disassembly, is designed and fabricated with the trained SMA wires. Corresponding experiments were conducted to analyzed natural frequency of the damping system, phase relations between quality vibrators and a controlled structure, variation regularity of the equivalent damping force changed with quality vibrators and length of swing links. The results show that phase relations between the quality vibrators and a controlled structure can keep steadily at 150°~180° when this damping system subjected to sine wave and real earthquake wave. Meanwhile, the equivalent damping force increases significantly with amplitude of external loads. In conclusion, this damping system can provide stable and efficient damping force and be applied simply to vibration control in structures, thus protect structures from strong dynamic disasters.
Key words
superelasticity /
SMA suspension pendulum damping system /
phase relation /
equivalent damping force
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References
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