温度对铁基形状记忆合金回复应力与力学性能的影响  

Effect of temperature on recovery stresses and properties ofiron-based shape memory alloys

作　　者：张耀文 陈适才[1] 孔潇[1] 戎树伟 王经臣 ZHANG Yaowen;CHEN Shicai;KONG Xiao;RONG Shuwei;WANG Jingchen(Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China;China Railway Construction Group Co.Ltd.,Beijing 100049,China)

机构地区：[1]北京工业大学城市建设学部,北京100124 [2]中铁建设集团有限公司,北京100049

出　　处：《功能材料》2024年第9期9022-9030,共9页Journal of Functional Materials

基　　金：国家自然科学基金(52278471)。

摘　　要：为研究温度对铁基形状记忆合金(Fe-SMA)回复应力的影响与力学特性,开展了Fe-SMA温度相关力学性能实验及其影响规律研究。首先,通过预拉伸、激活实验研究了不同激活温度对Fe-SMA棒材回复应力的影响规律,并在实验研究的基础上,建立了Fe-SMA回复应力-温度的经验本构模型;其次,进行二次加热实验研究了不同激活温度、附加荷载和暴露温度对Fe-SMA棒材回复应力的影响;最后,通过高温后的Fe-SMA棒材单调拉伸实验,研究其高温后的力学性能。研究结果表明,建立的Fe-SMA回复应力-温度的模型,可以有效地模拟Fe-SMA的回复应力与温度的关系;在二次加热过程中,当激活温度低于200℃时,Fe-SMA具有较高的应力保持比。Fe-SMA棒材的应力损失随着附加荷载和暴露温度的增加有所增大;在经历高温后,剩余的形状记忆效应使得Fe-SMA棒材的应力高于初始应力,并且其弹性模量和极限强度保持相对稳定,而屈服强度随着暴露温度的升高而略微增加。该研究可为Fe-SMA构件的抗火设计与应用提供参考依据。In order to study the effect of temperature on the recovery stress and mechanical properties of iron-based shape memory alloys(Fe-SMA),experiments on the temperature-related mechanical properties of Fe-SMA and their influence laws were carried out.Firstly,the effects of different activation temperatures on the recovery stress of Fe-SMA rods were investigated by pre-stretching and activation experiments,and an empirical ontological model of recovery stress-temperature of Fe-SMA was established on the basis of experimental studies.Secondly,secondary heating experiments were carried out to investigate the effects of different activation temperatures,additional loads,and exposure temperatures on the recovery stress of Fe-SMA rods.Finally,the mechanical properties of Fe-SMA rods after high temperature were investigated by monotonic tensile experiments.The results show that the established model of Fe-SMA recovery stress-temperature can effectively simulate the relationship between recovery stress and temperature of Fe-SMA.During the secondary heating process,when the activation temperature is lower than 200℃,Fe-SMA has a high stress retention ratio,and the stress loss of Fe-SMA rods increases with the elevated of the additional load and the exposure temperature.After experiencing high temperature,the residual shape memory effect induces higher stresses in Fe-SMA rods compared to the initial stresses.The modulus of elasticity and ultimate strength exhibit relative stability,whereas the yield strength experiences a slight increase with rising exposure temperatures.This investigation serves as a reference for informing the fire-resistant design and utilization of Fe-SMA members in academic discourse.

关 键 词：形状记忆合金(SMA) 形状记忆效应 温度作用 回复应力 力学性能 

分 类 号：TU375[建筑科学—结构工程]