Dynamic actuation of a novel laser-processed NiTi linear actuator
Dynamic actuation of a novel laser-processed NiTi linear actuator
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DOI：
10.1088/0964-1726/21/9/094004
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发表时间：
2012-09
影响因子：
4.1
通讯作者：
A. Pequegnat;M. Daly;J. Wang;Y. Zhou;M. I. Khan
中科院分区：
文献类型：
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作者：
A. Pequegnat;M. Daly;J. Wang;Y. Zhou;M. I. Khan
采用一种新颖的激光加工技术，能够局部修改形状记忆效应，以增强NiTi线性执行器的功能。通过改变局部转变温度，一个额外的存储器被传递到一个单片NiTi线中，通过控制电阻加热来实现动态驱动。使用定制的弹簧偏置测试装置对执行器的负载、位移和循环特性进行了表征。单调拉伸试验也用于表征马氏体相的变形行为。观察到的激光加工材料变形行为的差异被发现影响了活动应变的大小。在150次循环后，残余应变趋于稳定，而可恢复应变保持不变。这种激光加工的致动器将允许实现形状记忆合金的新应用和改进的控制方法。
A novel laser processing technique, capable of locally modifying the shape memory effect, was applied to enhance the functionality of a NiTi linear actuator. By altering local transformation temperatures, an additional memory was imparted into a monolithic NiTi wire to enable dynamic actuation via controlled resistive heating. Characterizations of the actuator load, displacement and cyclic properties were conducted using a custom-built spring-biased test set-up. Monotonic tensile testing was also implemented to characterize the deformation behaviour of the martensite phase. Observed differences in the deformation behaviour of laser-processed material were found to affect the magnitude of the active strain. Furthermore, residual strain during cyclic actuation testing was found to stabilize after 150 cycles while the recoverable strain remained constant. This laser-processed actuator will allow for the realization of new applications and improved control methods for shape memory alloys.