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首页> 外文期刊>Review of Scientific Instruments >Design and fabrication of a bending rotation fatigue test rig for in situ electrochemical analysis during fatigue testing of NiTi shape memory alloy wires
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Design and fabrication of a bending rotation fatigue test rig for in situ electrochemical analysis during fatigue testing of NiTi shape memory alloy wires

机译：NiTi形状记忆合金线疲劳测试过程中用于电化学原位分析的弯曲旋转疲劳测试仪的设计与制造

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摘要

The current investigation proposes a novel method for simultaneous assessment of the electrochemical and structural fatigue properties of nickel-titanium shape memory alloy (NiTi SMA) wires. The design and layout of an in situ electrochemical cell in a custom-made bending rotation fatigue (BRF) test rig is presented. This newly designed test rig allows performing a wide spectrum of experiments for studying the influence of fatigue on corrosion and vice versa. This can be achieved by performing ex situ and/or in situ measurements. The versatility of the combined electrochemical/mechanical test rig is demonstrated by studying the electrochemical behavior of NiTi SMA wires in 0.9% NaCl electrolyte under load. The ex situ measurements allow addressing various issues, for example, the influence of pre-fatigue on the localized corrosion resistance, or the influence of hydrogen on fatigue life. Ex situ experiments showed that a pre-fatigued wire is more susceptible to localized corrosion. The synergetic effect can be concluded from the polarization studies and specifically from an in situ study of the open circuit potential (OCP) transients, which sensitively react to the elementary repassivation events related to the local failure of the oxide layer. It can also be used as an indicator for identifying the onset of the fatigue failure.
机译：当前的研究提出了一种同时评估镍钛形状记忆合金（NiTi SMA）线的电化学和结构疲劳性能的新方法。介绍了定制弯曲弯曲疲劳（BRF）测试台中原位电化学电池的设计和布局。这种新设计的试验台可进行广泛的实验，以研究疲劳对腐蚀的影响，反之亦然。这可以通过执行异位和/或原位测量来实现。通过研究负载下0.9％NaCl电解质中NiTi SMA丝的电化学行为，证明了组合式电化学/机械试验台的多功能性。异位测量可以解决各种问题，例如，预疲劳对局部耐腐蚀性的影响，或氢对疲劳寿命的影响。异位实验表明，预疲劳线材更容易受到局部腐蚀的影响。协同作用可以从极化研究中得出，特别是从对开路电势（OCP）瞬态的原位研究中得出结论，该瞬变对与氧化物层局部失效有关的基本再钝化事件敏感地做出反应。它也可以用作识别疲劳失效开始的指标。

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