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首页> 外文期刊>Journal of Materials Engineering and Performance >Analysis of Wire Position and Operating Conditions on Functioning of NiTi Wires for Shape Memory Actuators
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Analysis of Wire Position and Operating Conditions on Functioning of NiTi Wires for Shape Memory Actuators

机译：形状记忆驱动器的镍钛丝功能的导线位置和工作条件分​​析

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摘要

In this work an experimental-numerical approach was used to analyze the thermo-mechanical behavior of thin NiTi wires, electrically heated, finalized to defining the influence of both wire position and the operating conditions of the actuator functioning. Tests were carried out on wires having diameters of 80 and 150 μm, loaded by constant stresses of 100 and 200 MPa and characterized by DSC and strain/temperature hysteresis measurements. Two wire positions (horizontal and vertical) were adopted in single cycle tests and designed to obtain different typologies of the heating and cooling transients. In general, the heating time was selected to reach a steady state condition while the cooling time always allowed decreasing the wire temperature to the ambient one. Data concerning strain, applied current and voltage were simultaneously acquired during the tests. Moreover, for the optimization and validation of a numerical model, for the 150 μm wire in diameter was used, its temperature was recorded by IR thermographic system. On the basis of the collected experimental data, a simple model was tested to reproduce the experimental results and data regarding the heat exchange coefficient and wire electrical resistivity dependence on temperature were obtained. The influence of the experimental wire positioning and wire diameter on the free convection coefficient is reported and the results indicate that the heating transient is associated with different convection coefficients depending on the heating modalities.
机译：在这项工作中，采用实验-数值方法分析了电加热的镍钛细线的热机械行为，最终确定了线位置和执行器工作条件的影响。在直径为80和150μm，承受100和200 MPa恒定应力的电线上进行测试，并通过DSC和应变/温度磁滞测量进行表征。在单周期测试中采用了两个导线位置（水平和垂直），其设计旨在获得不同类型的加热和冷却瞬态。通常，选择加热时间以达到稳定状态，而冷却时间始终允许将焊丝温度降低到环境温度。在测试过程中同时获取有关应变，施加的电流和电压的数据。此外，为了优化和验证数值模型，对于直径为150μm的线材，通过红外热成像系统记录其温度。在收集的实验数据的基础上，测试了一个简单的模型以重现实验结果，并获得了有关热交换系数和导线电阻率对温度的依赖性的数据。记录了实验导线位置和导线直径对自由对流系数的影响，结果表明，取决于加热方式，加热瞬变与不同的对流系数有关。

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