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Development and Performance Evaluation of a Mechanical Connection for Steel and Shape Memory Alloy Bars
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Development and Performance Evaluation of a Mechanical Connection for Steel and Shape Memory Alloy Bars
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Development and Performance Evaluation of a Mechanical Connection for Steel and Shape Memory Alloy Bars
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Journal Article
Development and Performance Evaluation of a Mechanical Connection for Steel and Shape Memory Alloy Bars
2024
Overview
Shape memory alloys (SMAs) demonstrate a shape memory effect and superelasticity that can provide recovery performance to structural members. In this study, a round SMA bar was designed to replace the conventional deformed steel bar, particularly within the plastic hinge section of structural members. To integrate the SMA bar and the existing steel bar, a mechanical coupler was proposed by utilizing the advantages of both one-touch and threaded couplers. Uniaxial tensile tests were conducted to analyze the performance of the proposed coupler and the mechanical properties of the SMA–steel connected bar. Stress and strain relationships were examined for steel bars mechanically connected with the SMA bar and for SMA bars before and after exhibiting the shape memory effect. To induce the shape memory effect, SMA should be heated above the finished austenite temperature. Due to the difficulty of accurately measuring strain on the heated bar using traditional contact methods, we employed digital image correlation technology for precise strain measurement of the heated SMA bar. The experimental results indicate the effective application of SMA bars within the plastic hinge region of structural members using the proposed mechanical coupler.
