High-cycle fatigue behavior of beta-titanium orthodontic wires
High-cycle fatigue behavior of beta-titanium orthodontic wires
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DOI：
10.4012/dmj.2014-012
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发表时间：
2015-04-01
影响因子：
2.5
通讯作者：
Mizoguchi, Itaru
中科院分区：
文献类型：
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作者：
Murakami, Takashi;Iijima, Masahiro;Mizoguchi, Itaru
本研究研究了三种β-Ti丝（TMA、Resolve、Gummetal）的高周疲劳行为。使用静态三点弯曲试验和三点弯曲模式的高循环疲劳试验评价疲劳。用扫描电子显微镜观察了断裂丝材的表面形貌，用微区X射线衍射分析了疲劳后的晶体结构。Gummetal丝表现出最低的弹性模量、弯曲强度和疲劳极限，并且表现出所研究的三种类型的丝中最高的回弹性。然而，在三种类型的导丝之间没有观察到失效循环次数的差异。所有线材的疲劳裂纹扩展和快速扩展区域均含有单相β-Ti。弹性模量和弯曲强度影响疲劳极限，尽管这些性能不影响断裂循环次数。三种类型的13-Ti导丝显示出相似的导丝断裂风险。
This study investigated high-cycle fatigue behavior in three beta-Ti wires (TMA, Resolve, Gummetal). Fatigue was evaluated using a static three-point bending test and a high-cycle fatigue test with a three-point bending mode. The surfaces of fractured wires were observed with scanning electron microscopy, and the post-fatigue crystal structures were determined by micro-X-ray diffraction. The Gummetal wire exhibited the lowest elastic modulus, bending strength and fatigue limit, and exhibited the highest resilience of the three types of wire studied. However, no difference in the number of cycles to failure was observed among the three types of wire. The fatigue crack propagation and rapid propagation regions of all wires contained single-phase beta-Ti. The elastic modulus and bending strength influenced the fatigue limit, although these properties did not affect the number of cycles to fracture. The three types of 13-Ti wires exhibited similar risks of wire fracture.