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Proceedings Paper

Experimental and analytical study on a shape memory alloy damper
Author(s): Krzystof Wilde; Yi Zheng; Paolo Gardoni; Yozo Fujino
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Paper Abstract

The superelastic behavior of shape memory alloys (SMAs) provides a stress-strain relation which is characterized by large hysteresis, superelastic effect, large ductility and variation of the material properties at different level of strain. Those properties can be effectively used in a design of SMA dampers for vibration control of bridges. In this paper, a device utilizing bending of SMA bars is experimentally tested. The bars of NiTi are kept on their ends by two rigid elements, moment arms, that are connected to the actuator and reaction wall. The force from the actuator, applied on the moment arms, exerts a uniform bending moment on the NiTi bars. The responses of NiTi alloys with different heat treatment are experimentally studied under cycling loading with various amplitudes. The test results confirmed a large hysteretic response of NiTi damper and its variable response at different displacement level. The experimental results are verified by simple 3D numerical simulations by FEM.

Paper Details

Date Published: 17 June 1998
PDF: 10 pages
Proc. SPIE 3325, Smart Structures and Materials 1998: Smart Systems for Bridges, Structures, and Highways, (17 June 1998); doi: 10.1117/12.310607
Show Author Affiliations
Krzystof Wilde, Univ. of Tokyo (Japan)
Yi Zheng, Univ. of Tokyo (Japan)
Paolo Gardoni, Univ. of California/Berkeley (Japan)
Yozo Fujino, Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 3325:
Smart Structures and Materials 1998: Smart Systems for Bridges, Structures, and Highways
S.-C. Liu, Editor(s)

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