PSI - Issue 36

Volodymyr Iasnii et al. / Procedia Structural Integrity 36 (2022) 284–289 Volodymyr Iasnii, Lukasz Sobaszek, Petro Yasniy / Structural Integrity Procedia 00 (2021) 000 – 000

288

5

0.0001 − 0.1 Hz. However, it was observed the increasing of device stiffness at amplitude of 4 mm compared to 3 mm. Further in the amplitude range of 4 − 9 mm it was spotted its monotonic decreasing under frequency range of 1 − 3 Hz.

230

100 150 200 250 300

0,001 Hz 0,005 Hz 0,01 Hz

210

0,1 Hz 0,5 Hz

190

1 Hz 2 Hz

170

F centr , N

0,001 Hz 0,005 Hz 0,01 Hz

150

-100 -50 0 50

130 Slope, N/mm

0,1 Hz 0,5 Hz

0

5

10

110

1 Hz 2 Hz

90

2

4

6

8

10

S a , mm

S a , mm

Fig. 6. The dependence of stiffness on the strain amplitude on the forward transformation region.

Fig. 7. The dependence of recovery force on the strain amplitude at the end of reverse transformation region.

The recovery force was determined at the end of reverse transformation region. The force monotonically increasing as the amplitude increases under all frequencies, except for the load frequency of 0.5 Hz and 1 Hz (Fig. 7). In general, the values of recovery force are in the range from -75 N to 250 N in the end of reverse transformation region for all load frequencies. When removing the external load, the obtained results of the recovery force are in line with previous studies of damping devices, for example (Soul and Yawny (2015)), where the maximum recovery force was equal to 250 N. 4. Conclusions The effect of frequencies and displacement amplitude on damping properties of the device studied experimentally. A damping device, based on the pre-stretched pseudoelastic SMA wires, has self-centring ability and good damping properties, and could be used in structures that operate under cyclic loading. The dissipation energy increase with the increasing in displacement amplitude of the device rod in the studied frequency range. The loss factor could be described by a monotonic decreasing function of the amplitude, except the frequencies of 0.001 Hz and 1 Hz. The stiffness decreases with the increase of displacement amplitude from 3 to 9 mm under all frequencies. The exceptions are for the load frequencies of 1 and 2 Hz with displacement amplitude of 3 and 4 mm when the stiffness increases. References Abdulridha, A., Palermo, D., 2017. Behaviour and modelling of hybrid SMA-steel reinforced concrete slender shear wall, Eng. Struct., 147, pp. 77 – 89, Doi: https://doi.org/10.1016/j.engstruct.2017.04.058. Ćwikła, A. , 2013. Smart materials as modern engineering substances, Adv. Sci. Technol. – Res. J., 7(17), pp. 66 – 72, Doi: 10.5604/20804075.1037002.