Experimental Study of Frame Structure Vibration Control Using CuZnAl SMA of Different Phase Transfor

The testing force and deformation curves of CuZnAl shape memory alloys(SMA) are measured out by the electronic universal testing machine. Three kinds of CuZnAl SMA treated by different heat treatment processes are concerned. Their phase tansformation temperature(Ms) is 120℃,150℃ and 10℃respectively.It shows: to the CuZnAl SMA in martensitic state under constant temperature, the area encircled by the hysteresis curve of the alloy of lower Ms is a bit larger than that of the higher. And the hysteresis area of the SMA in martensitic state is much larger than that of SMA in austenitic state. As we all know, the larger area hysteresis curve encircles, the better the effect of vibration attenuation is. CuZnAl alloys treated by waterquenching, oilquenching and marquenching have more steady shape memory effect, have better superplasticity and pseudoelasticity. Regardless of aging time, strain and exciting frequency, the number of η is reduced gradually in the order of the alloys treated by oilquenching, waterquenching and marquenching. Vibration experiment data of a 2story frame, on which CuZnAl dampers are fixed, are tested and analyzed by the dynamic data collecting analytical instrument. It is found that vibration damping of the frame with SMA dampers is quicker than that of the frame without SMA dampers and its attenuation time is only one tenth of that of the frame without SMA dampers. The damper of SMA in martensitic state under constant temperature needs rapid heating and cooling while the damper of SMA in austenitic state under constant temperature does not, which is the great advantage of the latter.