INVESTIGATION ON A NEW INTELLIGENT PROPERTIES OF SHAPE MEMORY ALLOY.

在一般热机械加载条件下，通过精密、系统的实验研究了形状记忆合金的主要特性——伪弹性性能和形状记忆性能。即在温度变化下对形状记忆合金制成的薄壁管状试件施加轴向力和扭矩的联合载荷，测量各种热力加载路径下的应变响应。结果中，可以发现形状记忆合金新的有趣行为，这对于形状记忆合金的工程/工业应用很有用。例如，形状记忆合金以三维方式变形，并且这种变形是可重复的、可控的。也就是说，形状记忆合金可以适用于三维定位装置的元件。在这种情况下，没有必要采用由许多形状记忆线组成的复杂系统来设计以三维方式平稳运行的机器人手臂。此外，还从微观角度对这些行为进行了分析。最后，建立了一组这些行为的本构方程，对于使用形状记忆合金进行执行器、传感器、机器人手臂、定位装置等的设计非常有用。

The pseudoelastic property and shape memory property which are the main features of shape memory alloy were investigated by the precise and systematic experiments under the general thermomechanical loading conditions. That is, the combined loads of axial force and torque were applied to the thin-walled tubular specimen made of shape memory alloy under the change of temperature, and the strain responses were measured for various kinds of thermo-mechanical loading paths. In the results, new interesting behaviors of shape memory alloy could be found, which are useful for engineering/industrial applications of shape memory alloy. For examples, shape memory alloy deforms in three-dimensional way, and this deformation is repeatable, and controlable. That is, the shape memory alloy may be applicable for the element for three-dimesional positioning device. In this case, it is not necessary to employ a complex system composed of many mumber of shape memory wires for the design of robot's arm which behaves smoothly in three-dimensional way. Also, these behaviors were analyzed from microscopic point of view. Finally, a set of constitutive equations for these behaviors was formulated, which are quite useful for the design of actuator, sensor, robots arm, positioning device and so on, by using the shape memory alloy.