构件裂纹的探测和主动控制的一种新方法

A NEW METHOD FOR CRACK-DETECTING AND ACTIVE CONTROL

提出将具有特殊力学性能和物理性能的形状记忆合金——NiTi丝埋入构件内部,利用构件内NiTi丝的电阻率大、对应变敏感和加热后可以产生巨大回复力等特点,可以实现对构件中的裂纹进行探测和主动控制裂纹的扩展。通过光弹试验和数值分析证明效果显著。

In this paper, a new method that is utilizing the unique mechanical properties and physical function of Shape Memory Alloy (SMA) which is embedded in the component to detect crack and actively control the crack growth is presented. The Shape Memory Alloys, and NiTi wire in particular, have many unique characteristics and behavior. For example, they have larger electric resistivity and higher sensitivity to strains, and will produce a large recovery force when heated, etc. The SMA-NiTi wires are embedded in the epoxy plate and tensile specimens are made. Both photoelastic experiment and numerical analysis are investigated. The experiment and calculation results show that this method can be used to the crack-detecting and actively control the crack growth, and the effect is obvious.