Open Access
ARTICLE
Experimental Study and a Modified Model for Temperature-Recovery Stress of Shape Memory Alloy Wire under Different Temperatures
Zhi-Xiang Wei1, Wen-Wei Wang2,*, Yan-Jie Xue3, Wu-Tong Zhang2, Qiu-Di Huang2
1 Guangxi Lepu Expressway Co., Ltd., Nanning, 530000, China
2
Department of Bridge Engineering, School of Transportation, Southeast University, Nanjing, 211189, China
3
Department of Road and Bridge Engineering, College of Construction Engineering, Jilin University, Changchun, 130012, China
*
Corresponding Author: Wen-Wei Wang. Email: wangwenwei@seu.edu.cn
(This article belongs to the Special Issue: Advancements in Smart Materials Dynamic Analysis for Novel Approaches of Structural Control and Healthy Monitoring)
Structural Durability & Health Monitoring https://doi.org/10.32604/sdhm.2024.054559
Received 31 May 2024; Accepted 07 August 2024; Published online 10 October 2024
Abstract
To investigate the performance of utilizing the shape memory effect of SMA (Shape Memory Alloy) wire to generate recovery stress, this paper performed single heating recovery stress tests and reciprocating heating-cooling
recovery stress tests on SMA wire under varying initial strain conditions. The effects of various strains and different energized heating methods on the recovery stress of SMA wires were explored in the single heating tests.
The SMA wire was strained from 2% to 8% initially, and two distinct heating approaches were employed: one
using a large current interval for rapid heating and one using a small current interval for slower heating. The
experimental outcomes reveal that during a single heating cycle, the temperature-recovery stress relationship
of SMA wire exhibits three distinct stages: the martensite phase stage, the transition stage from martensite to austenite phase, and the austenite phase stage. Notably, the choice of heating method does not influence the maximum recovery stress value, and the correlation between initial strain and maximum recovery stress is
predominantly linear. Moreover, conducting the reciprocating temperature rise and fall performance test is
important to better simulate the scenario in practical engineering where multiple recovery stress in SMA wires
for structural repair. In this test, two temperature cycling methods were studied: interval rise and fall, as well
as direct rise and fall. In the case of utilizing the interval temperature rise and fall method, it was observed that
the recovery stress associated with cooling was significantly higher than that corresponding to heating at the same
temperature. Furthermore, the recovery stress was lower upon subsequent heating than that measured during the
previous heating cycle. Based on the experimental results, a prediction model for the temperature-recovery stress
relationship has been proposed to simplify numerical calculations. It is hoped that an approximate temperaturerecovery stress curve can be obtained from the parameters of the SMA wire. The calculated values derived from
this model show good alignment with the measured values, indicating its reliability.
Keywords
SMA wire; temperature; recovery stress; modified model; phase transition
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