[논문]Cyclic behavior of superelastic shape memory alloys (SMAs) under various loading conditions

Hu, Jong Wan

doi:10.22645/udi.2018.7.1.005

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The nickel-titanium shape memory alloy (SMA), referred to as Nitinol, exhibits a superelastic effect that can be restored to its original shape even if a significant amount of deformation is applied at room temperature, without any additional heat treatment after removal of the load. Owing to these ...

The nickel-titanium shape memory alloy (SMA), referred to as Nitinol, exhibits a superelastic effect that can be restored to its original shape even if a significant amount of deformation is applied at room temperature, without any additional heat treatment after removal of the load. Owing to these unique material characteristics, it has widely used as displacement control devices for seismic retrofitting in civil engineering fields as well as medical, electrical, electronic and mechanical fields. Contrary to ordinarty carbon steel, superelastic SMAs are very resistant to fatigue, and have force-displacement properties depending on loading speed. The change for the mechanical properties of superelastic SMAs are experimentally inviestigated in this study when loading cycle numbers and loading speeds are different. In addition, the standardized force-displacement properties of such superelastic SMAs are proposed with an aim to efficiently design the seismic retrofitting devices made of these materials.

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문제 정의

For this reason, there is a limit to some extend of accurately estimating the performance of the device under different seismic loads with different durations and speeds. Therefore, this study is intended to investigate the mechanical properties of superelastic SMA specimens by varying the number of loading cycles and loading speeds. Thereafter, we can also observe the post-yield strength and residual strain of these specimens in the obtained force-displacement curve.

가설 설정

In this study, we investigated superelastic shape memory alloy which can be used as a damper in a construction site. The experimental results of the superelastic shape memory alloy, which is the subject of the study, reduce the occurrence of residual displacement based on excellent restoring force.

제안 방법

testing [4]. In this study, dynamic loading tests were carried out under the displacement-controlled loading history under different loading speeds, and quasi-static fatigue tests were conducted as well with different loading cycles under the same loading speed. Each of specimens uniformly has 3mm thickness while the effective width and length were designed to be 25mm and 60mm, respectively.
The average stress-strain curves of the material specimens used in the experimental tests are presented in Figure 2. The loading history was imposed on the specimens with the target strain of 1%, 3%, and 5% by the displacement control method. Finally, ultimate strain was applied until failure occurred.
In case of dynamic loads, experimental tests were performed by applying a triangular sawtooth displacement-controlled load history, which gradually increases the amplitude of the displacement load cycle (Δcycle), to the material specimen. Basically, the same displacement-controlled load hysteresis curves were used for five models, but material experiments were performed with different loading speeds (i.e., 0.033mm/sec for SMA-1, 0.165mm/sec for SMA-2, 0.330mm/sec for SMA-3, 1.650mm/sec for SMA-4, and 3.300mm/sec for SMA-5model).
construction site. The experimental results of the superelastic shape memory alloy, which is the subject of the study, reduce the occurrence of residual displacement based on excellent restoring force. The superelastic shape memory alloy exhibits flagship hysteretic behavior with improved energy dissipation capability when quasi-static cyclic loading is applied by controlling displacement at room temperature.

성능/효과

5mm residual displacement. Therefore, in this study, it can be concluded that the mechanical properties of the superelastic SMA materials utilized for seismic retrofitting design, change when the loading speed is varied.
The superelastic shape memory alloy exhibits flagship hysteretic behavior with improved energy dissipation capability when quasi-static cyclic loading is applied by controlling displacement at room temperature. Based on the results of this study, it can be concluded that the superelastic shape memory alloy can be effectively used for earthquake load under high speed load condition instead of low speed static load. In the future, it will be possible to develop a seismic design method with improved performance if a super - elastic shape memory alloy is applied to seismic system.

참고문헌 (4)

Song, G., Ma, N. and Li, .H. N. (2006) "Applications of shape memory alloys in civil structures", Eng. Struct. Vol. 28, pp. 1266.

상세보기
Seo, J. and Hu, J. W. (2016) "Seismic Response and Performance Evaluation of Self-Centering LRB Isolators Installed on the CBF Building under NF Ground Motions", Sustainability, Vol. 8, pp. 109.

상세보기
Hu, J. W. and Leon, R. T. (2011)"Analyses and evaluations for composite-moment frames with SMA PR-CFT connections", Nonlin. Dyna. Vol. 65, pp. 433.

상세보기
ASTM Standard ASTM A370-17 (2006) Standard Test Method and Definition for Mechanical Testing of Steel Product, West Conshohocken, PA, USA.

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[국내논문] Cyclic behavior of superelastic shape memory alloys (SMAs) under various loading conditions 원문보기

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[국내논문] Cyclic behavior of superelastic shape memory alloys (SMAs) under various loading conditions 원문보기

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