Experimental Investigation on the Cyclic Compression Behavior of Superelastic NiTi SMA Bars

Abstract

Over the past decade, shape memory alloy (SMA) in the form of wires and cables have been extensively studied for various structural engineering applications. There are numerous application areas where pure compression (or coupled with tension) is the primary load bearing scenario, which requires larger size SMA bars. However, the compression behavior of SMA bars is not well known, and little is reported in the literature. In that perspective, this paper presents an experimental study on large diameter superelastic Nickel-Titanium (NiTi) bars subjected to a cyclic compression load. A total of nine SMA bars having slenderness ratios ranging from 60 to 90 were tested. Hysteretic stress-strain responses are plotted and critical buckling load, energy dissipation and residual strain of SMA bars with different slenderness ratios are presented.

Cyclic and uniaxial tensile properties of superelastic niti shape memory alloy cables

“…Currently, SMA materials are primarily available in the form of wires [8][9][10], rods [11][12][13][14], helical springs [15], disc springs [16], and sheets [17] in the market. However, these configurations of SMA materials either need help to meet the high load-bearing capacity required for most civil engineering applications or involve difficulties in processing and high costs, making them challenging for large-scale utilization.…”