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首页> 外文期刊>Smart Materials & Structures >The influence of hysteresis loop in a NiTi shape memory oscillator behavior
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The influence of hysteresis loop in a NiTi shape memory oscillator behavior

机译：滞后回路在Niti形状记忆振荡器行为中的影响

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摘要

This work consists of an experimental and a numerical investigation on how heat treated Ti-50.7% at Ni springs can affect the dynamical behavior of a single degree of freedom (1DOF) oscillator. Initially, the springs are solution annealed at 300 degrees C, 400 degrees C and 500 degrees C over 30, 60, 90, and 120 min. After, the springs are characterized, through quasi-static loadings following a cyclic thermomechanical loading path until the inelastic strains saturate and the behavior of the springs stabilizes. The results demonstrate that springs aged at 400 degrees C and 500 degrees C present a larger hysteresis loop area when compared with those aged at 300 degrees C. Then, the springs aged at 500 degrees C are used in an experimental apparatus that represents a 1DOF system-the SMA spring represents the element of stiffness-and are analyzed in an up and down sweep frequency at two different temperatures. It is observed that the maximum amplitudes strongly depends on the temperatures and on the frequency test. It is also noticeable that the springs with higher hysteresis loop area results in lower maximum amplitudes. Finally, the 1DOF system is numerically modeled, in which a constitutive model is used to describe the SMA spring behavior. When the numerical and experimental results are compared, it is observable a difference, suggesting that the hysteresis loop may present a very different and counter intuitive behavior when subjected to dynamic loads.
机译：这项工作包括实验性和关于Ni Springs在Ni-50.7％的热处理的数值调查可以影响单一自由度（1dof）振荡器的动态行为。最初，溶液以超过30,60,90和120分钟的300℃，400℃，400℃和500℃的溶液退火。之后，弹簧的特征在于通过循环热机械负载路径之后的准静态载荷，直到无间隙菌株饱和并且弹簧的行为稳定。结果表明，与300摄氏度的那些时，在400摄氏度和500摄氏度下呈现出400℃和500℃的弹簧呈现较大的滞后环区域。然后，在500℃下的弹簧用于代表1dof系统的实验装置中使用 - SMA弹簧代表刚度的元素 - 在两个不同温度下以上下扫描频率分析。观察到最大幅度强烈取决于温度和频率测试。它还显着的是，具有较高滞后环区域的弹簧导致最大幅度较低。最后，1dof系统在数模上建模，其中，组成型模型用于描述SMA弹簧行为。当比较数值和实验结果时，可以观察到差异，表明滞后回路可以在经受动态负载时呈现非常不同和反向直观的行为。

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