Two-way shape memory coil springs: design, actuation, and stability

Xiaotao Zu; Zhiguo Wang; Huajun Yu

doi:10.1117/12.779876

1 November 2007 Two-way shape memory coil springs: design, actuation, and stability

Xiaotao Zu, Zhiguo Wang, Huajun Yu

Proceedings Volume 6423, International Conference on Smart Materials and Nanotechnology in Engineering; 64232H (2007) https://doi.org/10.1117/12.779876
Event: International Conference on Smart Materials and Nanotechnology in Engineering, 2007, Harbin, China

Abstract

In industrial applications, shape memory alloys (SMAs) are very often used as two-way actuators, in the form of coil springs, which capitalize on the capacity of small shear to produce large displacement. One way to achieve the two-way actuators is using a one-way shape memory effect SMAs spring with a bias spring, the other way is two-way shape memory effect (TWSME) SMAs spring. However, the TWSME is not inherent property of SMAs, suitable thermomechanical training is required to develop this effect. In this work, methods of developing TWSME are designed for SMAs and factors which affect the TWSME are investigated. Two types of TWSME spring are obtained using the designed methods. One type is extension spring, which can extend upon heating and contract upon cooling and this other type is contraction spring, which can contract upon heating and extend upon cooling. The actuation behaviors of these two types TWSME are investigated. And the stability of TWSME was also studied with working cycles and annealing.

Citation Download Citation

Xiaotao Zu, Zhiguo Wang, and Huajun Yu "Two-way shape memory coil springs: design, actuation, and stability", Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64232H (1 November 2007); https://doi.org/10.1117/12.779876

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