CALIBRATION OF THE HYSTERESIS LOOP OF SMA WIRES HEATED BY ELECTRIC CURRENT

Document Type : Original Article

Authors

1 Graduate student, Dept. of Aerospace Eng., Cairo University.

2 Associate professor of aircraft structures, Dept. of Aerospace Eng., Cairo University.

3 Professor of aircraft control and guidance, Dept. of Aerospace Eng., Cairo University.

Abstract

ABSTRACT
The undesirable vibrations in all structures types (buildings, vehicles, machines and
electronics) affect the durability, performance and the control of these structures.
Damping of these vibrations is the concern of many researches using smart
materials. The super-elastic behavior of shape memory alloys (SMA) may be utilized
in the active damping of structures vibrations.
SMA wire was obtained for this research but we had to calibrate it to get loadelongation-
heat relations. In the process of SMA calibrating, an experimental device
was designed to measure different loadings and the corresponding elongations at
different heating conditions. To control the temperature an electric direct
current was used.
The obtained experimental results were similar to the results in several published
researches. The relation between the electric current and the crystal transformation
of SMA under different loadings is well defined. Clear stress-strain curves showing
the hysteresis loop at different current values were obtained.

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