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首页> 外文期刊>Science of advanced materials >Cyclic Tests in Pushing and Pulling Actions of SMA Rings in Superelastic or Martensitic States
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Cyclic Tests in Pushing and Pulling Actions of SMA Rings in Superelastic or Martensitic States

机译：SMA环在超弹性或马氏体状态下的推拉作用的循环试验

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摘要

Applications of shape memory alloys (SMAs) in engineering generally use bars or wires. However, they should be used only in tension since bars possess risk of buckling and wires do not have any resistance to compression. Thus, they cannot be used in pushing as well as in pulling actions. To overcome this problem, SMA rings are becoming more popular as an alternative element in pushing and pulling actions for smart devices. This study prepared SMA rings in superelastic or martensitic states and conducted cyclic tests in pushing and pulling directions. The outside diameter of rings and thickness were 70 mm and 4 mm, respectively. A special device was designed for the tests and solid bars and plates were used to provide gripping. The SMA rings in the pulling action were loaded by combing bending and tension while they were used together for bending and compression with a pushing action. The SMA rings showed different behaviors in pushing and pulling actions. This difference in behavior may have been caused by the secondary moment due to the P-delta effect. As expected, the superelastic SMA rings showed good self-centering capacity, and the martensitic SMA rings showed a large area of stress-strain hysteresis. Thus, the superelastic SMA ring could be used for self-centering devices, and the martensitic SMA ring can be used for energy dissipation devices.
机译：形状记忆合金（SMA）在工程中的应用通常使用钢筋或金属丝。但是，它们仅应在张紧状态下使用，因为钢筋有弯曲的危险，导线对压缩没有任何抵抗力。因此，它们不能用于推动以及拉动动作。为了克服这个问题，SMA环作为推动和拉动智能设备的替代元素而变得越来越流行。这项研究制备了处于超弹性或马氏体状态的SMA环，并在推拉方向上进行了循环测试。环的外径和厚度分别为70毫米和4毫米。设计了一种专用于测试的设备，并使用实心条和板进行抓握。处于拉动状态的SMA环通过组合弯曲和张力来加载，同时通过推力一起用于弯曲和压缩。 SMA环在推拉动作中表现出不同的行为。这种行为上的差异可能是由于P-delta效应引起的次级力矩引起的。正如预期的那样，超弹性SMA环表现出良好的自定心能力，而马氏体SMA环表现出较大的应力应变滞后区域。因此，超弹性SMA环可用于自定心设备，而马氏体SMA环可用于耗能设备。

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