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首页> 外文期刊>Journal of Materials Engineering and Performance >Evaluation Methods for Non-contact Bend and Free Recovery Tests of Thin NiTi Wires and Their Effects on Measured Transformation Temperatures
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Evaluation Methods for Non-contact Bend and Free Recovery Tests of Thin NiTi Wires and Their Effects on Measured Transformation Temperatures

机译：非接触弯曲的评价方法和薄NITI线的自由恢复试验及其对测量变换温度的影响

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摘要

Non-contact evaluation of transformation temperatures via bend and free recovery tests requires precise optical evaluation of shape changes of NiTi components. A variety of experimental setups is documented in the literature, but the influence of the evaluation method on the transformation temperatures is rarely assessed in detail. In the present work, the reverse transformation of bent wires is evaluated comparing the tracking of the lowest wire point and the tracking of the curvature. For calculating curvatures, different approaches of fitting the wire outline were applied. Fourth degree polynomials and ellipse segment fits were found to cause high noise toward the end of the reverse transformation, second degree polynomials and circle segment fits led to increased sensitivity in that region. Accordingly, the evaluation of curvature allowed to resolve a two-stage reverse transformation, which was otherwise obscured. The reasons for this effect are discussed comparing curvatures as determined by the different evaluation methods.
机译：通过弯曲和自由恢复试验的变换温度的非接触式评价需要精确的光学评估Niti组分的形状变化。文献中记录了各种实验装置，但是详细评估了评价方法对转化温度的影响。在本作工作中，评估弯曲线的反向变换比较最低线点的跟踪和曲率的跟踪。为了计算曲率，施加不同的配合线轮廓的方法。发现第四度多项式和椭圆片段配合拟合在反向变换结束时对高噪声，二级多项式和圆段拟合在该区域增加到增加的灵敏度。因此，允许评估曲率来解析两级反向变换，其否则模糊。讨论了通过不同的评估方法确定的比较曲率的曲率的原因。

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