Study of pseudoelastic systems for the design of complex passive dampers: static analysis and modeling

Abstract

This work presents an experimental and numerical analysis of several parallel systems of NiTi pseudoelastic wires. Standard tensile tests were accomplished to evaluate the global damping capacity, the energy dissipated per cycle and the maximum attenuated force in a static condition. Besides, a numerical model was implemented to predict the damping response of more complex pseudoelastic arrangements. It was found a damping capacity upper limit of 0.09 regardless the number and the length of the NiTi components.In addition, it was found that the energy dissipated per cycle is related to the strain and to the number of the NiTi components; furthermore, the system composed of NiTi wires with different length allows for an elastic region that is related to the numbers of wires and that presents a modulation of the stiffness. Finally, the proposed numerical model allows a precise design of complex pseudoelastic combinations as it is able to represent the Rhombohedral characteristic.

A Pseudoelastic Floor Isolation System for Hospital Seismic Retrofitting

“…Quasi-static and dynamic cyclic tests have been performed by Nespoli et al [13,14] to assess the mechanical behavior, initially on single SMA wires, subsequently on pseudoelastic systems (composed by groups of two wires), and finally on the global device ( Fig. 1(b)).…”

“…Therefore, the work is organized as follows: in Section 2 we discuss the novel passive damper developed by Nespoli et al [13], composed by a parallel system of shape-memory alloy wires (indicated as 'SMA device'). Initially, we focus on the device dynamics, both empirically (through experimental tests performed by Nespoli et al [14]) and numerically (by means of 3D finite element models developed using the software Abaqus [15], in Section 2.1).…”

A Study on Damping Property of NiTi Elements Produced by Selective Laser‐Beam Melting

“…Among others, NiTi components are used to preserve instrumentations and sensitive equipment from environmental noise and structural vibrations. [ 2–8 ] The practical applications of NiTi dampers are usually under isothermal conditions and may involve either low or high strain amplitudes, encouraging two different methodologies of investigation, accordingly.…”

“…[ 13 ] Proper thermo‐mechanical processing and NiTi composition can maximize the transformation hysteresis, inducing high loading and low unloading plateau. [ 7 ] Pseudoelastic NiTi is now deeply studied for those applications that involve large parts or assemblies such as buildings [ 14,15 ] and space structures, [ 16–20 ] thanks to both the large superelastic strains (up to 8%) and the self‐centering capability.…”

Development and validation of a nonlinear dynamic model for tuned liquid multiple columns dampers

“…Advances in construction methods and materials have led to more flexible structures, thereby raising the demand on reducing vibrations caused by natural hazards. Such vibrations can be mitigated through the incorporation of supplemental damping devices, including passive [1,2], semi-active [3,4,5] and active [6,7] systems. Of interest to this paper are passive systems, which have been widely accepted by the field due to their mechanical robustness and mitigation performance without necessitating external power [8].…”