Multifactor experimental investigation of the mechanical performance of a shape memory alloy-based self-centering-energy-dissipation device

摘要

An innovative self-centering-energy-dissipation device (SCED) based on a superelastic shape memory alloy (SMA) is developed. This device exhibits asymmetric, flag-shaped hysteretic behavior and tension-compression symmetry property. The symmetry is attributed to the tension-only state of the SMA wires in the device during the loading process. The working principle of the device is described, and a theoretical model describing the mechanical properties of the device is proposed. Uniaxial tension-compression cyclic loading tests are carried out to investigate the influence of the section area of the SMA wire, the loading amplitude, and the loading rate on the mechanical performance, including the yield strength, maximum strength, austenite stiffness, martensite stiffness, energy dissipation, and efficiency ratio. Expressions of the correction factors and mechanical performance considering multiple factors are also suggested.