摘要
目的利用热动力学电阻理论和拉伸试验,建立超弹性状态的形状记忆合金(SMA)电阻-应变模型.方法在SMA热动力学电阻模型的基础上,采用数值分析和实验验证相结合的方法,创建了SMA超弹性分段线性化模型.在完成SMA单向拉伸试验的基础上,提取具有代表性的实验数据,验证电阻-应变模型的有效性.结果得到电阻-应变试验曲线,并建立了曲线的数学表达式.结论所提出的SMA电阻-应变模型与实验结果吻合很好,可以有效地表达SMA超弹性电阻-应变之间的关系.
The paper focuses on the establishment of strain for shape memory alloy (SMA) wires. Based constitutive model of the electrical resistance (ER) and on the thelmo-mechanical theory of SMAs, an experiment of ER for the austenite SMA wires was carried out in the laboratory and a constitutive model for the ER performance was developed based on the experimental data and numerical simulation. The developed model can be represented by a three stage curve which includes two linear stages and a parabolic one. The simplified model can be effectively used in structural health monitoring which used SMA wire as sensors by embedding it in the structure.
出处
《沈阳建筑大学学报(自然科学版)》
CAS
2008年第6期980-984,共5页
Journal of Shenyang Jianzhu University:Natural Science
基金
建设部科学技术项目(2008-k4-39)
辽宁省教育厅重点实验室开放基金项目(JG-200606)
沈阳市人才专项基金项目(2007140203002)