摘要
形状记忆合金是智能材料与结构中很有希望的驱动材料。本文研究了外加应力和残留应变对形状记忆合金ＮｉＴｉ丝的电阻的影响。研究发现，在３０℃下的恒温过程中，外加应力对ＮｉＴｉ丝电阻的影响可以分为两种情况，一种是在弹性变形过程中，电阻随着应力的增加呈线性增加；另一种是在发生组织变化的过程中，当发生应力诱发马氏体相变时，电阻降低；当发生马氏体孪生变形时，电阻随着应力的增加而增加。应变对电阻的影响表现为随着ＮｉＴｉ丝的残余应变量的增加，电阻线性地增加。
NiTi shape memory alloys have great potential to be applied in the intelligent material systems and structures. For this purpose,the relationships between the applied stress, residual strain and electrical resistance of NiTi shape memory alloys have been studied in the present papers. The tests are performed under constant temperature condition to understand the effect of the applied stress and the residual strain on the resistance. The results show that in the loading process,the resistance varies linearly with the variation of the applied stress in the elastic deformation stage, and increases sharply in the stress induced martensitic transformation stage, and decreases sharply in the martensitic twinning stage. The resistance increases linearly as the residual strain increases. The tests also perform to see the effect of applied stress and residual strain on the shapes of the resistance temperature curves in the thermal cycle process.
出处
《功能材料》
EI
CAS
CSCD
北大核心
1998年第2期161-164,共4页
Journal of Functional Materials
基金
上海交通大学振动
冲击与噪声国家重点实验室资助
