摘要
由于形状记忆合金具有优良的力学性能,近年来在土木工程领域受到广泛关注.通过在不同的循环加载条件下对形状记忆合金丝材进行的拉伸试验,以相变应力、相变应变、弹性模量、残余应变、耗能能力等作为合金丝材的超弹性特征参数,分析这些特征参数与应变幅值、加载频率、循环次数的关系.结果表明:应变幅值和循环次数对形状记忆合金超弹性性能的影响较大,而加载频率的影响基本可以忽略,实际应用时,应根据具体情况进行试验研究并合理设计.
As it has excellent mechanical properties,the shape memory alloy has been widely concerned in civil engineering field in recent years.Through the tensile test of the shape memory alloy wires under different cyclic loading conditions,this paper analyzes the relationship between these parameters and the strain amplitude,loading frequency and cycle numbers,taking the phase transformation stress,phase transformation strain,elastic module,residual strain and capacity of dissipated energy as superelastic characteristic parameters.The results indicate that the strain amplitude and cycle numbers have great influence on the superelasticity of the SMA,but the influence of loading frequency can be neglected in the main.So we should carry out experimental studies and reasonable designs according to the specific circumstances in practical applications.
出处
《青岛理工大学学报》
CAS
2011年第5期23-29,共7页
Journal of Qingdao University of Technology
基金
国家自然科学基金资助项目(50809032)
中国博士后科学基金第二批特别资助项目(200902540)
中国博士后科学基金资助项目(20070421051)
海岸和近海工程国家重点实验室开放基金资助项目(LP1009)
关键词
形状记忆合金
拉伸试验
循环加载
超弹性
shape memory alloy
tensile test
cyclic loading
superelasticity
