Fatigue of Shape Memory Alloys
Fatigue of Shape Memory Alloys
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DOI：
10.1002/9781118426913.ch5
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发表时间：
2015-11
期刊：
影响因子：
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通讯作者：
M. Mahtabi;N. Shamsaei;M. Elahinia
中科院分区：
文献类型：
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作者：
M. Mahtabi;N. Shamsaei;M. Elahinia
疲劳通常被定义为材料在循环载荷下的逐渐劣化。这种类型的失败非常重要，因为它具有意想不到的性质。它会在没有任何警告的情况下对机械和生物医学系统造成严重破坏。在文献中，疲劳被发现是所有机械故障的50%-90%[1]。正如前几章所讨论的，形状记忆合金在汽车、航空航天、民用和生物工程等各个行业都有广泛的应用。在这些应用中，许多实际载荷条件是循环的；因此，疲劳往往是此类部件和结构的主要失效模式。两种突出的超弹性镍钛医疗设备是用于扩张血管的支架和用于根管治疗的牙钻。在这些SMA元件中，血管的扩张和收缩以及牙列中的扭转载荷构成了循环载荷。一些早期的研究已经考虑了SMA执行器的疲劳，并证实了这些部件的低周疲劳行为[2]。第一篇关于形状记忆合金的疲劳行为的文章发表于1958年，针对单晶的铜铝镍在平面弯曲[3]。通过发现
Fatigue is generally defined as the gradual deterioration of materials under cyclic loading. This type of failure is very important because of its unexpected nature. It can cause serious damage to mechanical and biomedical systems without any warning. In the literature, fatigue has been found to be responsible for 50-90% of all mechanical failures [1]. As discussed in the previous chapters, shape memory alloys have widespread applications in various industries such as automotive, aerospace, civil, and bioengineering. The realistic loading condition in many of these applications is cyclic; therefore, fatigue is often the main failure mode for such components and structures. Two prominent superelastic NiTi medical devices are the stents to expand the blood vessels and the dental files for root canal treatments. Expansion and contraction of the blood vessels and the torsional loadings in dental files constitute as cyclic loading in these SMA elements. Some early studies have considered the fatigue of SMA actuators and confirmed a low-cycle fatigue behavior in these components [2]. The first article addressing the fatigue behavior of an SMA was published in 1958 for a single-crystal Cu-Al-Ni in plane bending [3]. By discovering